diff --git a/java-collections-maps-2/README.md b/java-collections-maps-2/README.md deleted file mode 100644 index 2188960543..0000000000 --- a/java-collections-maps-2/README.md +++ /dev/null @@ -1,16 +0,0 @@ -## Java Collections Cookbooks and Examples - -This module contains articles about Map data structures in Java. - -### Relevant Articles: -- [Map of Primitives in Java](https://www.baeldung.com/java-map-primitives) -- [Copying a HashMap in Java](https://www.baeldung.com/java-copy-hashmap) -- [A Guide to Java HashMap](https://www.baeldung.com/java-hashmap) -- [Guide to WeakHashMap in Java](https://www.baeldung.com/java-weakhashmap) -- [Map to String Conversion in Java](https://www.baeldung.com/java-map-to-string-conversion) -- [Iterate over a Map in Java](https://www.baeldung.com/java-iterate-map) -- [Merging Two Maps with Java 8](https://www.baeldung.com/java-merge-maps) -- [Sort a HashMap in Java](https://www.baeldung.com/java-hashmap-sort) -- [Finding the Highest Value in a Java Map](https://www.baeldung.com/java-find-map-max) -- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap) -- More articles: [[<-- prev]](/java-collections-maps) [[next -->]](/java-collections-maps-3) diff --git a/java-collections-maps-2/pom.xml b/java-collections-maps-2/pom.xml deleted file mode 100644 index a246559f61..0000000000 --- a/java-collections-maps-2/pom.xml +++ /dev/null @@ -1,79 +0,0 @@ - - - 4.0.0 - java-collections-maps-2 - 0.1.0-SNAPSHOT - java-collections-maps-2 - jar - - - com.baeldung - parent-java - 0.0.1-SNAPSHOT - ../parent-java - - - - - org.eclipse.collections - eclipse-collections - ${eclipse-collections.version} - - - net.sf.trove4j - trove4j - ${trove4j.version} - - - it.unimi.dsi - fastutil - ${fastutil.version} - - - colt - colt - ${colt.version} - - - org.apache.commons - commons-lang3 - ${commons-lang3.version} - - - org.apache.commons - commons-collections4 - ${commons-collections4.version} - - - one.util - streamex - ${streamex.version} - - - com.jayway.awaitility - awaitility - ${avaitility.version} - test - - - org.assertj - assertj-core - ${assertj.version} - test - - - - - 0.6.5 - 4.1 - 1.7.0 - 8.2.0 - 3.0.2 - 8.1.0 - 1.2.0 - 3.11.1 - - - \ No newline at end of file diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/Product.java b/java-collections-maps-2/src/main/java/com/baeldung/map/Product.java deleted file mode 100644 index 5559895730..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/Product.java +++ /dev/null @@ -1,133 +0,0 @@ -package com.baeldung.map; - -import java.util.*; - -public class Product { - - private String name; - private String description; - private List tags; - - public Product(String name, String description) { - this.name = name; - this.description = description; - this.tags = new ArrayList<>(); - } - - public String getName() { - return name; - } - - public String getDescription() { - return description; - } - - public List getTags() { - return tags; - } - - public Product addTagsOfOtherProdcut(Product product) { - this.tags.addAll(product.getTags()); - return this; - } - - @Override - public boolean equals(Object o) { - - if (this == o) { - return true; - } - if (o == null || getClass() != o.getClass()) { - return false; - } - - Product product = (Product) o; - return Objects.equals(name, product.name) && - Objects.equals(description, product.description); - } - - @Override - public int hashCode() { - return Objects.hash(name, description); - } - - public static void forEach() { - - HashMap productsByName = new HashMap<>(); - productsByName.forEach( (key, product) - -> System.out.println("Key: " + key + " Product:" + product.getDescription()) - //do something with the key and value - ); - - //Prior to Java 8: - for(Map.Entry entry : productsByName.entrySet()) { - Product product = entry.getValue(); - String key = entry.getKey(); - //do something with the key and value - } - } - - public static void getOrDefault() { - - HashMap productsByName = new HashMap<>(); - Product chocolate = new Product("chocolate", "something sweet"); - Product defaultProduct = productsByName.getOrDefault("horse carriage", chocolate); - Product bike = productsByName.getOrDefault("E-Bike", chocolate); - - //Prior to Java 8: - Product bike2 = productsByName.containsKey("E-Bike") - ? productsByName.get("E-Bike") - : chocolate; - Product defaultProduct2 = productsByName.containsKey("horse carriage") - ? productsByName.get("horse carriage") - : chocolate; - } - - public static void putIfAbsent() { - - HashMap productsByName = new HashMap<>(); - Product chocolate = new Product("chocolate", "something sweet"); - productsByName.putIfAbsent("E-Bike", chocolate); - - //Prior to Java 8: - if(productsByName.containsKey("E-Bike")) { - productsByName.put("E-Bike", chocolate); - } - } - - public static void merge() { - - HashMap productsByName = new HashMap<>(); - Product eBike2 = new Product("E-Bike", "A bike with a battery"); - eBike2.getTags().add("sport"); - productsByName.merge("E-Bike", eBike2, Product::addTagsOfOtherProdcut); - - //Prior to Java 8: - if(productsByName.containsKey("E-Bike")) { - productsByName.get("E-Bike").addTagsOfOtherProdcut(eBike2); - } else { - productsByName.put("E-Bike", eBike2); - } - } - - public static void compute() { - - HashMap productsByName = new HashMap<>(); - Product eBike2 = new Product("E-Bike", "A bike with a battery"); - - productsByName.compute("E-Bike", (k,v) -> { - if(v != null) { - return v.addTagsOfOtherProdcut(eBike2); - } else { - return eBike2; - } - }); - - //Prior to Java 8: - if(productsByName.containsKey("E-Bike")) { - productsByName.get("E-Bike").addTagsOfOtherProdcut(eBike2); - } else { - productsByName.put("E-Bike", eBike2); - } - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/convert/MapToString.java b/java-collections-maps-2/src/main/java/com/baeldung/map/convert/MapToString.java deleted file mode 100644 index d13be924ff..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/convert/MapToString.java +++ /dev/null @@ -1,34 +0,0 @@ -package com.baeldung.map.convert; - -import com.google.common.base.Joiner; -import org.apache.commons.lang3.StringUtils; - -import java.util.Map; -import java.util.stream.Collectors; - -public class MapToString { - - public static String convertWithIteration(Map map) { - StringBuilder mapAsString = new StringBuilder("{"); - for (Integer key : map.keySet()) { - mapAsString.append(key + "=" + map.get(key) + ", "); - } - mapAsString.delete(mapAsString.length()-2, mapAsString.length()).append("}"); - return mapAsString.toString(); - } - - public static String convertWithStream(Map map) { - String mapAsString = map.keySet().stream() - .map(key -> key + "=" + map.get(key)) - .collect(Collectors.joining(", ", "{", "}")); - return mapAsString; - } - - public static String convertWithGuava(Map map) { - return Joiner.on(",").withKeyValueSeparator("=").join(map); - } - - public static String convertWithApache(Map map) { - return StringUtils.join(map); - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/convert/StringToMap.java b/java-collections-maps-2/src/main/java/com/baeldung/map/convert/StringToMap.java deleted file mode 100644 index 416ba4dd9a..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/convert/StringToMap.java +++ /dev/null @@ -1,21 +0,0 @@ -package com.baeldung.map.convert; - -import com.google.common.base.Splitter; - -import java.util.Arrays; -import java.util.Map; -import java.util.stream.Collectors; - -public class StringToMap { - - public static Map convertWithStream(String mapAsString) { - Map map = Arrays.stream(mapAsString.split(",")) - .map(entry -> entry.split("=")) - .collect(Collectors.toMap(entry -> entry[0], entry -> entry[1])); - return map; - } - - public static Map convertWithGuava(String mapAsString) { - return Splitter.on(',').withKeyValueSeparator('=').split(mapAsString); - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/copyhashmap/CopyHashMap.java b/java-collections-maps-2/src/main/java/com/baeldung/map/copyhashmap/CopyHashMap.java deleted file mode 100644 index cb18f3aa11..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/copyhashmap/CopyHashMap.java +++ /dev/null @@ -1,55 +0,0 @@ -package com.baeldung.map.copyhashmap; - -import org.apache.commons.lang3.SerializationUtils; - -import java.util.HashMap; -import java.util.Map; -import java.util.Map.Entry; -import java.util.Set; -import java.util.stream.Collectors; - -public class CopyHashMap { - - public static HashMap copyUsingConstructor(HashMap originalMap) { - return new HashMap(originalMap); - } - - public static HashMap copyUsingClone(HashMap originalMap) { - return (HashMap) originalMap.clone(); - } - - public static HashMap copyUsingPut(HashMap originalMap) { - HashMap shallowCopy = new HashMap(); - Set> entries = originalMap.entrySet(); - for(Map.Entry mapEntry: entries) { - shallowCopy.put(mapEntry.getKey(), mapEntry.getValue()); - } - - return shallowCopy; - } - - public static HashMap copyUsingPutAll(HashMap originalMap) { - HashMap shallowCopy = new HashMap(); - shallowCopy.putAll(originalMap); - - return shallowCopy; - } - - public static HashMap copyUsingJava8Stream(HashMap originalMap) { - Set> entries = originalMap.entrySet(); - HashMap shallowCopy = (HashMap) entries - .stream() - .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); - - return shallowCopy; - } - - public static HashMap shallowCopy(HashMap originalMap) { - return (HashMap) originalMap.clone(); - } - - public static HashMap deepCopy(HashMap originalMap) { - return SerializationUtils.clone(originalMap); - } - -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/initialize/MapInitializer.java b/java-collections-maps-2/src/main/java/com/baeldung/map/initialize/MapInitializer.java deleted file mode 100644 index 4d63abcfd0..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/initialize/MapInitializer.java +++ /dev/null @@ -1,80 +0,0 @@ -package com.baeldung.map.initialize; - -import java.util.AbstractMap; -import java.util.Collections; -import java.util.HashMap; -import java.util.Map; -import java.util.stream.Collectors; -import java.util.stream.Stream; - -public class MapInitializer { - - public static Map articleMapOne; - static { - articleMapOne = new HashMap<>(); - articleMapOne.put("ar01", "Intro to Map"); - articleMapOne.put("ar02", "Some article"); - } - - public static Map createSingletonMap() { - Map passwordMap = Collections.singletonMap("username1", "password1"); - return passwordMap; - - } - - public Map createEmptyMap() { - Map emptyMap = Collections.emptyMap(); - return emptyMap; - } - - public Map createUsingDoubleBrace() { - Map doubleBraceMap = new HashMap() { - - /** - * - */ - private static final long serialVersionUID = 1L; - - { - put("key1", "value1"); - put("key2", "value2"); - } - }; - return doubleBraceMap; - } - - public Map createMapUsingStreamStringArray() { - Map map = Stream.of(new String[][] { { "Hello", "World" }, { "John", "Doe" }, }) - .collect(Collectors.toMap(data -> data[0], data -> data[1])); - - return map; - } - - public Map createMapUsingStreamObjectArray() { - Map map = Stream.of(new Object[][] { { "data1", 1 }, { "data2", 2 }, }) - .collect(Collectors.toMap(data -> (String) data[0], data -> (Integer) data[1])); - - return map; - } - - public Map createMapUsingStreamSimpleEntry() { - Map map = Stream.of(new AbstractMap.SimpleEntry<>("idea", 1), new AbstractMap.SimpleEntry<>("mobile", 2)) - .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); - - return map; - } - - public Map createMapUsingStreamSimpleImmutableEntry() { - Map map = Stream.of(new AbstractMap.SimpleImmutableEntry<>("idea", 1), new AbstractMap.SimpleImmutableEntry<>("mobile", 2)) - .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); - - return map; - } - - public Map createImmutableMapWithStreams() { - Map map = Stream.of(new String[][] { { "Hello", "World" }, { "John", "Doe" }, }) - .collect(Collectors.collectingAndThen(Collectors.toMap(data -> data[0], data -> data[1]), Collections:: unmodifiableMap)); - return map; - - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/iteration/MapIteration.java b/java-collections-maps-2/src/main/java/com/baeldung/map/iteration/MapIteration.java deleted file mode 100644 index b0c32e1487..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/iteration/MapIteration.java +++ /dev/null @@ -1,74 +0,0 @@ -package com.baeldung.map.iteration; - -import java.util.HashMap; -import java.util.Iterator; -import java.util.Map; - -public class MapIteration { - - public static void main(String[] args) { - MapIteration mapIteration = new MapIteration(); - Map map = new HashMap<>(); - - map.put("One", 1); - map.put("Three", 3); - map.put("Two", 2); - - System.out.println("Iterating Keys of Map Using KeySet"); - mapIteration.iterateKeys(map); - - System.out.println("Iterating Map Using Entry Set"); - mapIteration.iterateUsingEntrySet(map); - - System.out.println("Iterating Using Iterator and Map Entry"); - mapIteration.iterateUsingIteratorAndEntry(map); - - System.out.println("Iterating Using KeySet and For Each"); - mapIteration.iterateUsingKeySetAndForeach(map); - - System.out.println("Iterating Map Using Lambda Expression"); - mapIteration.iterateUsingLambda(map); - - System.out.println("Iterating Using Stream API"); - mapIteration.iterateUsingStreamAPI(map); - } - - public void iterateUsingEntrySet(Map map) { - for (Map.Entry entry : map.entrySet()) { - System.out.println(entry.getKey() + ":" + entry.getValue()); - } - } - - public void iterateUsingLambda(Map map) { - map.forEach((k, v) -> System.out.println((k + ":" + v))); - } - - public void iterateUsingIteratorAndEntry(Map map) { - Iterator> iterator = map.entrySet() - .iterator(); - while (iterator.hasNext()) { - Map.Entry pair = iterator.next(); - System.out.println(pair.getKey() + ":" + pair.getValue()); - } - } - - public void iterateUsingKeySetAndForeach(Map map) { - for (String key : map.keySet()) { - System.out.println(key + ":" + map.get(key)); - } - } - - public void iterateUsingStreamAPI(Map map) { - map.entrySet() - .stream() - .forEach(e -> System.out.println(e.getKey() + ":" + e.getValue())); - } - - public void iterateKeys(Map map) { - for (String key : map.keySet()) { - System.out.println(key); - } - - } - -} \ No newline at end of file diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/mapmax/MapMax.java b/java-collections-maps-2/src/main/java/com/baeldung/map/mapmax/MapMax.java deleted file mode 100644 index 8c33c857ee..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/mapmax/MapMax.java +++ /dev/null @@ -1,92 +0,0 @@ -package com.baeldung.map.mapmax; - -import java.util.*; -import java.util.Map.Entry; - -public class MapMax { - - public > V maxUsingIteration(Map map) { - - Map.Entry maxEntry = null; - - for (Map.Entry entry : map.entrySet()) { - - if (maxEntry == null || entry.getValue() - .compareTo(maxEntry.getValue()) > 0) { - maxEntry = entry; - } - } - - return maxEntry.getValue(); - } - - public > V maxUsingCollectionsMax(Map map) { - - Entry maxEntry = Collections.max(map.entrySet(), new Comparator>() { - public int compare(Entry e1, Entry e2) { - return e1.getValue() - .compareTo(e2.getValue()); - } - }); - - return maxEntry.getValue(); - } - - public > V maxUsingCollectionsMaxAndLambda(Map map) { - - Entry maxEntry = Collections.max(map.entrySet(), (Entry e1, Entry e2) -> e1.getValue() - .compareTo(e2.getValue())); - - return maxEntry.getValue(); - } - - public > V maxUsingCollectionsMaxAndMethodReference(Map map) { - - Entry maxEntry = Collections.max(map.entrySet(), Comparator.comparing(Map.Entry::getValue)); - - return maxEntry.getValue(); - } - - public > V maxUsingStreamAndLambda(Map map) { - - Optional> maxEntry = map.entrySet() - .stream() - .max((Entry e1, Entry e2) -> e1.getValue() - .compareTo(e2.getValue())); - - return maxEntry.get() - .getValue(); - } - - public > V maxUsingStreamAndMethodReference(Map map) { - - Optional> maxEntry = map.entrySet() - .stream() - .max(Comparator.comparing(Map.Entry::getValue)); - - return maxEntry.get() - .getValue(); - } - - public static void main(String[] args) { - - Map map = new HashMap(); - - map.put(1, 3); - map.put(2, 4); - map.put(3, 5); - map.put(4, 6); - map.put(5, 7); - - MapMax mapMax = new MapMax(); - - System.out.println(mapMax.maxUsingIteration(map)); - System.out.println(mapMax.maxUsingCollectionsMax(map)); - System.out.println(mapMax.maxUsingCollectionsMaxAndLambda(map)); - System.out.println(mapMax.maxUsingCollectionsMaxAndMethodReference(map)); - System.out.println(mapMax.maxUsingStreamAndLambda(map)); - System.out.println(mapMax.maxUsingStreamAndMethodReference(map)); - - } - -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/Employee.java b/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/Employee.java deleted file mode 100644 index d7fb0d1a1d..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/Employee.java +++ /dev/null @@ -1,60 +0,0 @@ -package com.baeldung.map.mergemaps; - -public class Employee implements Comparable { - - private Long id; - private String name; - - public Employee(Long id, String name) { - this.name = name; - this.id = id; - } - - public Long getId() { - return id; - } - - public void setId(Long id) { - this.id = id; - } - - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - @Override - public boolean equals(Object o) { - if (this == o) return true; - if (o == null || getClass() != o.getClass()) return false; - - Employee employee = (Employee) o; - - if (!id.equals(employee.id)) return false; - return name.equals(employee.name); - - } - - @Override - public int hashCode() { - int result = id.hashCode(); - result = 31 * result + name.hashCode(); - return result; - } - - @Override - public String toString() { - return "Employee{" + - "id=" + id + - ", name='" + name + '\'' + - '}'; - } - - @Override - public int compareTo(Employee employee) { - return (int)(this.id - employee.getId()); - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/MergeMaps.java b/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/MergeMaps.java deleted file mode 100644 index 4f187bad90..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/mergemaps/MergeMaps.java +++ /dev/null @@ -1,105 +0,0 @@ -package com.baeldung.map.mergemaps; - -import one.util.streamex.EntryStream; - -import java.util.HashMap; -import java.util.Map; -import java.util.stream.Collectors; -import java.util.stream.Stream; - -public class MergeMaps { - - private static Map map1 = new HashMap<>(); - private static Map map2 = new HashMap<>(); - - public static void main(String[] args) { - - initialize(); - - mergeFunction(); - - streamConcat(); - - streamOf(); - - streamEx(); - - streamMerge(); - } - - private static void streamMerge() { - - Map map3 = map2.entrySet() - .stream() - .collect( - Collectors.toMap( - Map.Entry::getKey, - Map.Entry::getValue, - (v1, v2) -> new Employee(v1.getId(), v2.getName()), - () -> new HashMap<>(map1) - ) - ); - - System.out.println(map3); - } - - private static void streamEx() { - Map map3 = EntryStream.of(map1) - .append(EntryStream.of(map2)) - .toMap((e1, e2) -> e1); - - System.out.println(map3); - - } - - private static void streamOf() { - Map map3 = Stream.of(map1, map2) - .flatMap(map -> map.entrySet().stream()) - .collect( - Collectors.toMap( - Map.Entry::getKey, - Map.Entry::getValue, - (v1, v2) -> new Employee(v1.getId(), v2.getName()) - ) - ); - - map3.entrySet().forEach(System.out::println); - } - - private static void streamConcat() { - Map result = Stream.concat(map1.entrySet().stream(), map2.entrySet().stream()).collect(Collectors.toMap( - Map.Entry::getKey, - Map.Entry::getValue, - (value1, value2) -> new Employee(value2.getId(), value1.getName()) - )); - - result.entrySet().forEach(System.out::println); - } - - private static void mergeFunction() { - Map map3 = new HashMap<>(map1); - - map2.forEach( - (key, value) -> map3.merge(key, value, (v1, v2) -> - new Employee(v1.getId(), v2.getName())) - ); - - map3.entrySet().forEach(System.out::println); - } - - - private static void initialize() { - Employee employee1 = new Employee(1L, "Henry"); - map1.put(employee1.getName(), employee1); - Employee employee2 = new Employee(22L, "Annie"); - map1.put(employee2.getName(), employee2); - Employee employee3 = new Employee(8L, "John"); - map1.put(employee3.getName(), employee3); - - Employee employee4 = new Employee(2L, "George"); - map2.put(employee4.getName(), employee4); - Employee employee5 = new Employee(3L, "Henry"); - map2.put(employee5.getName(), employee5); - } - -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/primitives/PrimitiveMaps.java b/java-collections-maps-2/src/main/java/com/baeldung/map/primitives/PrimitiveMaps.java deleted file mode 100644 index 30bec12ccc..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/primitives/PrimitiveMaps.java +++ /dev/null @@ -1,69 +0,0 @@ -package com.baeldung.map.primitives; - -import cern.colt.map.AbstractIntDoubleMap; -import cern.colt.map.OpenIntDoubleHashMap; -import gnu.trove.map.TDoubleIntMap; -import gnu.trove.map.hash.TDoubleIntHashMap; -import it.unimi.dsi.fastutil.ints.Int2BooleanMap; -import it.unimi.dsi.fastutil.ints.Int2BooleanOpenHashMap; -import it.unimi.dsi.fastutil.ints.Int2BooleanSortedMap; -import it.unimi.dsi.fastutil.ints.Int2BooleanSortedMaps; -import org.eclipse.collections.api.map.primitive.ImmutableIntIntMap; -import org.eclipse.collections.api.map.primitive.MutableIntIntMap; -import org.eclipse.collections.api.map.primitive.MutableObjectDoubleMap; -import org.eclipse.collections.impl.factory.primitive.IntIntMaps; -import org.eclipse.collections.impl.factory.primitive.ObjectDoubleMaps; - -public class PrimitiveMaps { - - public static void main(String[] args) { - - eclipseCollectionsMap(); - troveMap(); - coltMap(); - fastutilMap(); - } - - private static void fastutilMap() { - Int2BooleanMap int2BooleanMap = new Int2BooleanOpenHashMap(); - int2BooleanMap.put(1, true); - int2BooleanMap.put(7, false); - int2BooleanMap.put(4, true); - - boolean value = int2BooleanMap.get(1); - - Int2BooleanSortedMap int2BooleanSorted = Int2BooleanSortedMaps.EMPTY_MAP; - } - - private static void coltMap() { - AbstractIntDoubleMap map = new OpenIntDoubleHashMap(); - map.put(1, 4.5); - double value = map.get(1); - } - - private static void eclipseCollectionsMap() { - MutableIntIntMap mutableIntIntMap = IntIntMaps.mutable.empty(); - mutableIntIntMap.addToValue(1, 1); - - ImmutableIntIntMap immutableIntIntMap = IntIntMaps.immutable.empty(); - - MutableObjectDoubleMap dObject = ObjectDoubleMaps.mutable.empty(); - dObject.addToValue("price", 150.5); - dObject.addToValue("quality", 4.4); - dObject.addToValue("stability", 0.8); - } - - private static void troveMap() { - double[] doubles = new double[] {1.2, 4.5, 0.3}; - int[] ints = new int[] {1, 4, 0}; - - TDoubleIntMap doubleIntMap = new TDoubleIntHashMap(doubles, ints); - - doubleIntMap.put(1.2, 22); - doubleIntMap.put(4.5, 16); - - doubleIntMap.adjustValue(1.2, 1); - doubleIntMap.adjustValue(4.5, 4); - doubleIntMap.adjustValue(0.3, 7); - } -} diff --git a/java-collections-maps-2/src/main/java/com/baeldung/map/sort/SortHashMap.java b/java-collections-maps-2/src/main/java/com/baeldung/map/sort/SortHashMap.java deleted file mode 100644 index 14610ffb00..0000000000 --- a/java-collections-maps-2/src/main/java/com/baeldung/map/sort/SortHashMap.java +++ /dev/null @@ -1,104 +0,0 @@ -package com.baeldung.map.sort; - -import com.baeldung.map.mergemaps.Employee; -import com.google.common.base.Functions; -import com.google.common.collect.ImmutableSortedMap; -import com.google.common.collect.Ordering; - -import java.util.*; -import java.util.stream.Collectors; - -public class SortHashMap { - - private static Map map = new HashMap<>(); - - public static void main(String[] args) { - - initialize(); - - treeMapSortByKey(); - - arrayListSortByValue(); - arrayListSortByKey(); - - sortStream(); - - sortGuava(); - - addDuplicates(); - - treeSetByKey(); - treeSetByValue(); - - } - - private static void sortGuava() { - final Ordering naturalOrdering = - Ordering.natural().onResultOf(Functions.forMap(map, null)); - - System.out.println(ImmutableSortedMap.copyOf(map, naturalOrdering)); - } - - private static void sortStream() { - map.entrySet().stream() - .sorted(Map.Entry.comparingByKey().reversed()) - .forEach(System.out::println); - - Map result = map.entrySet().stream() - .sorted(Map.Entry.comparingByValue()) - .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, - (oldValue, newValue) -> oldValue, LinkedHashMap::new)); - - result.entrySet().forEach(System.out::println); - } - - private static void treeSetByValue() { - SortedSet values = new TreeSet<>(map.values()); - System.out.println(values); - } - - private static void treeSetByKey() { - SortedSet keysSet = new TreeSet<>(map.keySet()); - System.out.println(keysSet); - } - - private static void treeMapSortByKey() { - TreeMap sorted = new TreeMap<>(map); - sorted.putAll(map); - - sorted.entrySet().forEach(System.out::println); - - } - - private static void arrayListSortByValue() { - List employeeById = new ArrayList<>(map.values()); - - Collections.sort(employeeById); - - System.out.println(employeeById); - } - - private static void arrayListSortByKey() { - List employeeByKey = new ArrayList<>(map.keySet()); - Collections.sort(employeeByKey); - System.out.println(employeeByKey); - } - - private static void initialize() { - Employee employee1 = new Employee(1L, "Mher"); - map.put(employee1.getName(), employee1); - Employee employee2 = new Employee(22L, "Annie"); - map.put(employee2.getName(), employee2); - Employee employee3 = new Employee(8L, "John"); - map.put(employee3.getName(), employee3); - Employee employee4 = new Employee(2L, "George"); - map.put(employee4.getName(), employee4); - } - - private static void addDuplicates() { - Employee employee5 = new Employee(1L, "Mher"); - map.put(employee5.getName(), employee5); - Employee employee6 = new Employee(22L, "Annie"); - map.put(employee6.getName(), employee6); - } -} diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/ProductUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/ProductUnitTest.java deleted file mode 100644 index ba29d5c454..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/ProductUnitTest.java +++ /dev/null @@ -1,174 +0,0 @@ -package com.baeldung.map; - -import org.junit.jupiter.api.Test; - -import java.util.HashMap; -import java.util.Map; -import java.util.Objects; - -import static org.junit.jupiter.api.Assertions.*; - -class ProductUnitTest { - - - @Test - public void getExistingValue() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - Product roadBike = new Product("Road bike", "A bike for competition"); - - productsByName.put(eBike.getName(), eBike); - productsByName.put(roadBike.getName(), roadBike); - - Product nextPurchase = productsByName.get("E-Bike"); - - assertEquals("A bike with a battery", nextPurchase.getDescription()); - } - - @Test - public void getNonExistingValue() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - Product roadBike = new Product("Road bike", "A bike for competition"); - - productsByName.put(eBike.getName(), eBike); - productsByName.put(roadBike.getName(), roadBike); - - Product nextPurchase = productsByName.get("Car"); - - assertNull(nextPurchase); - } - - @Test - public void getExistingValueAfterSameKeyInsertedTwice() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - Product roadBike = new Product("Road bike", "A bike for competition"); - Product newEBike = new Product("E-Bike", "A bike with a better battery"); - - productsByName.put(eBike.getName(), eBike); - productsByName.put(roadBike.getName(), roadBike); - productsByName.put(newEBike.getName(), newEBike); - - Product nextPurchase = productsByName.get("E-Bike"); - - assertEquals("A bike with a better battery", nextPurchase.getDescription()); - } - - @Test - public void getExistingValueWithNullKey() { - HashMap productsByName = new HashMap<>(); - - Product defaultProduct = new Product("Chocolate", "At least buy chocolate"); - - productsByName.put(null, defaultProduct); - productsByName.put(defaultProduct.getName(), defaultProduct); - - Product nextPurchase = productsByName.get(null); - assertEquals("At least buy chocolate", nextPurchase.getDescription()); - - nextPurchase = productsByName.get("Chocolate"); - assertEquals("At least buy chocolate", nextPurchase.getDescription()); - } - - @Test - public void insertSameObjectWithDifferentKey() { - HashMap productsByName = new HashMap<>(); - - Product defaultProduct = new Product("Chocolate", "At least buy chocolate"); - - productsByName.put(null, defaultProduct); - productsByName.put(defaultProduct.getName(), defaultProduct); - - assertSame(productsByName.get(null), productsByName.get("Chocolate")); - } - - @Test - public void checkIfKeyExists() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - - productsByName.put(eBike.getName(), eBike); - - assertTrue(productsByName.containsKey("E-Bike")); - } - - @Test - public void checkIfValueExists() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - - productsByName.put(eBike.getName(), eBike); - - assertTrue(productsByName.containsValue(eBike)); - } - - @Test - public void removeExistingKey() { - HashMap productsByName = new HashMap<>(); - - Product eBike = new Product("E-Bike", "A bike with a battery"); - Product roadBike = new Product("Road bike", "A bike for competition"); - - productsByName.put(eBike.getName(), eBike); - productsByName.put(roadBike.getName(), roadBike); - - productsByName.remove("E-Bike"); - - assertNull(productsByName.get("E-Bike")); - } - - @Test - public void givenMutableKeyWhenKeyChangeThenValueNotFound() { - // Given - MutableKey key = new MutableKey("initial"); - - Map items = new HashMap<>(); - items.put(key, "success"); - - // When - key.setName("changed"); - - // Then - assertNull(items.get(key)); - } - - static class MutableKey { - private String name; - - public MutableKey(String name) { - this.name = name; - } - - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - @Override - public boolean equals(Object o) { - if (this == o) { - return true; - } - if (o == null || getClass() != o.getClass()) { - return false; - } - MutableKey that = (MutableKey) o; - return Objects.equals(name, that.name); - } - - @Override - public int hashCode() { - return Objects.hash(name); - } - } - -} diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/convert/MapToStringUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/convert/MapToStringUnitTest.java deleted file mode 100644 index 4517dea328..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/convert/MapToStringUnitTest.java +++ /dev/null @@ -1,48 +0,0 @@ -package com.baeldung.map.convert; - -import org.apache.commons.collections4.MapUtils; -import org.junit.Assert; -import org.junit.jupiter.api.BeforeEach; -import org.junit.jupiter.api.Test; - -import java.util.HashMap; -import java.util.Map; - -public class MapToStringUnitTest { - - private Map wordsByKey = new HashMap<>(); - - @BeforeEach - public void setup() { - wordsByKey.clear(); - wordsByKey.put(1, "one"); - wordsByKey.put(2, "two"); - wordsByKey.put(3, "three"); - wordsByKey.put(4, "four"); - } - - @Test - public void givenMap_WhenUsingIteration_ThenResultingMapIsCorrect() { - String mapAsString = MapToString.convertWithIteration(wordsByKey); - Assert.assertEquals("{1=one, 2=two, 3=three, 4=four}", mapAsString); - } - - @Test - public void givenMap_WhenUsingStream_ThenResultingMapIsCorrect() { - String mapAsString = MapToString.convertWithStream(wordsByKey); - Assert.assertEquals("{1=one, 2=two, 3=three, 4=four}", mapAsString); - } - - @Test - public void givenMap_WhenUsingGuava_ThenResultingMapIsCorrect() { - String mapAsString = MapToString.convertWithGuava(wordsByKey); - Assert.assertEquals("1=one,2=two,3=three,4=four", mapAsString); - } - - @Test - public void givenMap_WhenUsingApache_ThenResultingMapIsCorrect() { - String mapAsString = MapToString.convertWithApache(wordsByKey); - Assert.assertEquals("{1=one, 2=two, 3=three, 4=four}", mapAsString); - MapUtils.debugPrint(System.out, "Map as String", wordsByKey); - } -} \ No newline at end of file diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/convert/StringToMapUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/convert/StringToMapUnitTest.java deleted file mode 100644 index 2f80b30871..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/convert/StringToMapUnitTest.java +++ /dev/null @@ -1,23 +0,0 @@ -package com.baeldung.map.convert; - -import org.junit.Assert; -import org.junit.jupiter.api.Test; - -import java.util.Map; - -public class StringToMapUnitTest { - - @Test - public void givenString_WhenUsingStream_ThenResultingStringIsCorrect() { - Map wordsByKey = StringToMap.convertWithStream("1=one,2=two,3=three,4=four"); - Assert.assertEquals(4, wordsByKey.size()); - Assert.assertEquals("one", wordsByKey.get("1")); - } - - @Test - void givenString_WhenUsingGuava_ThenResultingStringIsCorrect() { - Map wordsByKey = StringToMap.convertWithGuava("1=one,2=two,3=three,4=four"); - Assert.assertEquals(4, wordsByKey.size()); - Assert.assertEquals("one", wordsByKey.get("1")); - } -} \ No newline at end of file diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/CopyHashMapUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/CopyHashMapUnitTest.java deleted file mode 100644 index e2d5e327e1..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/CopyHashMapUnitTest.java +++ /dev/null @@ -1,76 +0,0 @@ -package com.baeldung.map.copyhashmap; - -import com.google.common.collect.ImmutableMap; -import org.junit.Test; - -import java.util.HashMap; -import java.util.Map; - -import static org.assertj.core.api.Assertions.assertThat; - -public class CopyHashMapUnitTest { - - @Test - public void givenHashMap_whenShallowCopy_thenCopyisNotSameAsOriginal() { - - HashMap map = new HashMap<>(); - Employee emp1 = new Employee("John"); - Employee emp2 = new Employee("Norman"); - map.put("emp1",emp1); - map.put("emp2",emp2); - - HashMap shallowCopy = CopyHashMap.shallowCopy(map); - - assertThat(shallowCopy).isNotSameAs(map); - - } - - @Test - public void givenHashMap_whenShallowCopyModifyingOriginalObject_thenCopyShouldChange() { - - HashMap map = new HashMap<>(); - Employee emp1 = new Employee("John"); - Employee emp2 = new Employee("Norman"); - map.put("emp1",emp1); - map.put("emp2",emp2); - - HashMap shallowCopy = CopyHashMap.shallowCopy(map); - - emp1.setName("Johny"); - - assertThat(shallowCopy.get("emp1")).isEqualTo(map.get("emp1")); - - } - - @Test - public void givenHashMap_whenDeepCopyModifyingOriginalObject_thenCopyShouldNotChange() { - - HashMap map = new HashMap<>(); - Employee emp1 = new Employee("John"); - Employee emp2 = new Employee("Norman"); - map.put("emp1",emp1); - map.put("emp2",emp2); - HashMap deepCopy = CopyHashMap.deepCopy(map); - - emp1.setName("Johny"); - - assertThat(deepCopy.get("emp1")).isNotEqualTo(map.get("emp1")); - - } - - @Test - public void givenImmutableMap_whenCopyUsingGuava_thenCopyShouldNotChange() { - Employee emp1 = new Employee("John"); - Employee emp2 = new Employee("Norman"); - - Map map = ImmutableMap. builder() - .put("emp1",emp1) - .put("emp2",emp2) - .build(); - Map shallowCopy = ImmutableMap.copyOf(map); - - assertThat(shallowCopy).isSameAs(map); - - } - -} diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/Employee.java b/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/Employee.java deleted file mode 100644 index 5db55c26ea..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/copyhashmap/Employee.java +++ /dev/null @@ -1,28 +0,0 @@ -package com.baeldung.map.copyhashmap; - -import java.io.Serializable; - -public class Employee implements Serializable{ - - private String name; - - public Employee(String name) { - super(); - this.name = name; - } - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - @Override - public String toString() { - return this.name; - } - -} - - diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/initialize/MapInitializerUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/initialize/MapInitializerUnitTest.java deleted file mode 100644 index 7c6dffe787..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/initialize/MapInitializerUnitTest.java +++ /dev/null @@ -1,27 +0,0 @@ -package com.baeldung.map.initialize; - -import org.junit.Test; - -import java.util.Map; - -import static org.junit.Assert.assertEquals; - -public class MapInitializerUnitTest { - - @Test - public void givenStaticMap_whenUpdated_thenCorrect() { - - MapInitializer.articleMapOne.put("NewArticle1", "Convert array to List"); - - assertEquals(MapInitializer.articleMapOne.get("NewArticle1"), "Convert array to List"); - - } - - @Test(expected=UnsupportedOperationException.class) - public void givenSingleTonMap_whenEntriesAdded_throwsException() { - - Map map = MapInitializer.createSingletonMap(); - map.put("username2", "password2"); - } - -} diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/mapmax/MapMaxUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/mapmax/MapMaxUnitTest.java deleted file mode 100644 index 30b945bfc8..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/mapmax/MapMaxUnitTest.java +++ /dev/null @@ -1,58 +0,0 @@ -package com.baeldung.map.mapmax; - - -import org.junit.Before; -import org.junit.Test; - -import java.util.HashMap; -import java.util.Map; - -import static org.junit.Assert.assertEquals; - -public class MapMaxUnitTest { - - Map map = null; - MapMax mapMax = null; - - - @Before - public void setupTestData() { - map = new HashMap(); - map.put(23, 12); - map.put(46, 24); - map.put(27, 38); - mapMax = new MapMax(); - } - - @Test - public void givenMap_whenIterated_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingIteration(map)); - } - - @Test - public void givenMap_whenUsingCollectionsMax_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingCollectionsMax(map)); - } - - @Test - public void givenMap_whenUsingCollectionsMaxAndLambda_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingCollectionsMaxAndLambda(map)); - } - - @Test - public void givenMap_whenUsingCollectionsMaxAndMethodReference_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingCollectionsMaxAndMethodReference(map)); - } - - @Test - public void givenMap_whenUsingStreamAndLambda_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingStreamAndLambda(map)); - } - - @Test - public void givenMap_whenUsingStreamAndMethodReference_thenReturnMaxValue() { - assertEquals(new Integer(38), mapMax.maxUsingStreamAndMethodReference (map)); - } - - -} diff --git a/java-collections-maps-2/src/test/java/com/baeldung/map/weakhashmap/WeakHashMapUnitTest.java b/java-collections-maps-2/src/test/java/com/baeldung/map/weakhashmap/WeakHashMapUnitTest.java deleted file mode 100644 index 293f24c378..0000000000 --- a/java-collections-maps-2/src/test/java/com/baeldung/map/weakhashmap/WeakHashMapUnitTest.java +++ /dev/null @@ -1,72 +0,0 @@ -package com.baeldung.map.weakhashmap; - - -import org.junit.Test; - -import java.util.WeakHashMap; -import java.util.concurrent.TimeUnit; - -import static com.jayway.awaitility.Awaitility.await; -import static org.junit.Assert.assertTrue; - -public class WeakHashMapUnitTest { - - @Test - public void givenWeakHashMap_whenCacheValueThatHasNoReferenceToIt_GCShouldReclaimThatObject() { - //given - WeakHashMap map = new WeakHashMap<>(); - BigImage bigImage = new BigImage("image_id"); - UniqueImageName imageName = new UniqueImageName("name_of_big_image"); - - map.put(imageName, bigImage); - assertTrue(map.containsKey(imageName)); - - //when big image key is not reference anywhere - imageName = null; - System.gc(); - - //then GC will finally reclaim that object - await().atMost(10, TimeUnit.SECONDS).until(map::isEmpty); - } - - @Test - public void givenWeakHashMap_whenCacheValueThatHasNoReferenceToIt_GCShouldReclaimThatObjectButLeaveReferencedObject() { - //given - WeakHashMap map = new WeakHashMap<>(); - BigImage bigImageFirst = new BigImage("foo"); - UniqueImageName imageNameFirst = new UniqueImageName("name_of_big_image"); - - BigImage bigImageSecond = new BigImage("foo_2"); - UniqueImageName imageNameSecond = new UniqueImageName("name_of_big_image_2"); - - map.put(imageNameFirst, bigImageFirst); - map.put(imageNameSecond, bigImageSecond); - assertTrue(map.containsKey(imageNameFirst)); - assertTrue(map.containsKey(imageNameSecond)); - - //when - imageNameFirst = null; - System.gc(); - - //then - await().atMost(10, TimeUnit.SECONDS).until(() -> map.size() == 1); - await().atMost(10, TimeUnit.SECONDS).until(() -> map.containsKey(imageNameSecond)); - } - - - class BigImage { - public final String imageId; - - BigImage(String imageId) { - this.imageId = imageId; - } - } - - class UniqueImageName { - public final String imageName; - - UniqueImageName(String imageName) { - this.imageName = imageName; - } - } -} diff --git a/java-collections-maps-3/README.md b/java-collections-maps-3/README.md deleted file mode 100644 index 886461a35c..0000000000 --- a/java-collections-maps-3/README.md +++ /dev/null @@ -1,8 +0,0 @@ -## Java Collections Cookbooks and Examples - -This module contains articles about Map data structures in Java. - -### Relevant Articles: -- [Java TreeMap vs HashMap](https://www.baeldung.com/java-treemap-vs-hashmap) -- [Comparing Two HashMaps in Java](https://www.baeldung.com/java-compare-hashmaps) -- More articles: [[<-- prev]](/java-collections-maps-2) diff --git a/java-collections-maps-3/pom.xml b/java-collections-maps-3/pom.xml deleted file mode 100644 index 30b0d01528..0000000000 --- a/java-collections-maps-3/pom.xml +++ /dev/null @@ -1,26 +0,0 @@ - - - 4.0.0 - java-collections-maps-3 - 0.1.0-SNAPSHOT - java-collections-maps-3 - jar - - - com.baeldung - parent-java - 0.0.1-SNAPSHOT - ../parent-java - - - - - - - - - - - \ No newline at end of file diff --git a/java-collections-maps-3/src/test/java/com/baeldung/map/compare/HashMapComparisonUnitTest.java b/java-collections-maps-3/src/test/java/com/baeldung/map/compare/HashMapComparisonUnitTest.java deleted file mode 100644 index 0edd0cd87b..0000000000 --- a/java-collections-maps-3/src/test/java/com/baeldung/map/compare/HashMapComparisonUnitTest.java +++ /dev/null @@ -1,225 +0,0 @@ -package com.baeldung.map.compare; - -import com.google.common.base.Equivalence; -import com.google.common.collect.MapDifference; -import com.google.common.collect.MapDifference.ValueDifference; -import com.google.common.collect.Maps; -import org.junit.Before; -import org.junit.Test; - -import java.util.Arrays; -import java.util.HashMap; -import java.util.Map; -import java.util.stream.Collectors; - -import static org.hamcrest.MatcherAssert.assertThat; -import static org.hamcrest.collection.IsMapContaining.hasEntry; -import static org.hamcrest.collection.IsMapContaining.hasKey; -import static org.junit.Assert.*; - -public class HashMapComparisonUnitTest { - - Map asiaCapital1; - Map asiaCapital2; - Map asiaCapital3; - - Map asiaCity1; - Map asiaCity2; - Map asiaCity3; - - @Before - public void setup(){ - asiaCapital1 = new HashMap(); - asiaCapital1.put("Japan", "Tokyo"); - asiaCapital1.put("South Korea", "Seoul"); - - asiaCapital2 = new HashMap(); - asiaCapital2.put("South Korea", "Seoul"); - asiaCapital2.put("Japan", "Tokyo"); - - asiaCapital3 = new HashMap(); - asiaCapital3.put("Japan", "Tokyo"); - asiaCapital3.put("China", "Beijing"); - - asiaCity1 = new HashMap(); - asiaCity1.put("Japan", new String[] { "Tokyo", "Osaka" }); - asiaCity1.put("South Korea", new String[] { "Seoul", "Busan" }); - - asiaCity2 = new HashMap(); - asiaCity2.put("South Korea", new String[] { "Seoul", "Busan" }); - asiaCity2.put("Japan", new String[] { "Tokyo", "Osaka" }); - - asiaCity3 = new HashMap(); - asiaCity3.put("Japan", new String[] { "Tokyo", "Osaka" }); - asiaCity3.put("China", new String[] { "Beijing", "Hong Kong" }); - } - - @Test - public void whenCompareTwoHashMapsUsingEquals_thenSuccess() { - assertTrue(asiaCapital1.equals(asiaCapital2)); - assertFalse(asiaCapital1.equals(asiaCapital3)); - } - - @Test - public void whenCompareTwoHashMapsWithArrayValuesUsingEquals_thenFail() { - assertFalse(asiaCity1.equals(asiaCity2)); - } - - @Test - public void whenCompareTwoHashMapsUsingStreamAPI_thenSuccess() { - assertTrue(areEqual(asiaCapital1, asiaCapital2)); - assertFalse(areEqual(asiaCapital1, asiaCapital3)); - } - - @Test - public void whenCompareTwoHashMapsWithArrayValuesUsingStreamAPI_thenSuccess() { - assertTrue(areEqualWithArrayValue(asiaCity1, asiaCity2)); - assertFalse(areEqualWithArrayValue(asiaCity1, asiaCity3)); - } - - @Test - public void whenCompareTwoHashMapKeys_thenSuccess() { - assertTrue(asiaCapital1.keySet().equals(asiaCapital2.keySet())); - assertFalse(asiaCapital1.keySet().equals(asiaCapital3.keySet())); - } - - @Test - public void whenCompareTwoHashMapKeyValuesUsingStreamAPI_thenSuccess() { - Map asiaCapital3 = new HashMap(); - asiaCapital3.put("Japan", "Tokyo"); - asiaCapital3.put("South Korea", "Seoul"); - asiaCapital3.put("China", "Beijing"); - - Map asiaCapital4 = new HashMap(); - asiaCapital4.put("South Korea", "Seoul"); - asiaCapital4.put("Japan", "Osaka"); - asiaCapital4.put("China", "Beijing"); - - Map result = areEqualKeyValues(asiaCapital3, asiaCapital4); - - assertEquals(3, result.size()); - assertThat(result, hasEntry("Japan", false)); - assertThat(result, hasEntry("South Korea", true)); - assertThat(result, hasEntry("China", true)); - } - - @Test - public void givenDifferentMaps_whenGetDiffUsingGuava_thenSuccess() { - Map asia1 = new HashMap(); - asia1.put("Japan", "Tokyo"); - asia1.put("South Korea", "Seoul"); - asia1.put("India", "New Delhi"); - - Map asia2 = new HashMap(); - asia2.put("Japan", "Tokyo"); - asia2.put("China", "Beijing"); - asia2.put("India", "Delhi"); - - MapDifference diff = Maps.difference(asia1, asia2); - Map> entriesDiffering = diff.entriesDiffering(); - - assertFalse(diff.areEqual()); - assertEquals(1, entriesDiffering.size()); - assertThat(entriesDiffering, hasKey("India")); - assertEquals("New Delhi", entriesDiffering.get("India").leftValue()); - assertEquals("Delhi", entriesDiffering.get("India").rightValue()); - } - - @Test - public void givenDifferentMaps_whenGetEntriesOnOneSideUsingGuava_thenSuccess() { - Map asia1 = new HashMap(); - asia1.put("Japan", "Tokyo"); - asia1.put("South Korea", "Seoul"); - asia1.put("India", "New Delhi"); - - Map asia2 = new HashMap(); - asia2.put("Japan", "Tokyo"); - asia2.put("China", "Beijing"); - asia2.put("India", "Delhi"); - - MapDifference diff = Maps.difference(asia1, asia2); - Map entriesOnlyOnRight = diff.entriesOnlyOnRight(); - Map entriesOnlyOnLeft = diff.entriesOnlyOnLeft(); - - assertEquals(1, entriesOnlyOnRight.size()); - assertThat(entriesOnlyOnRight, hasEntry("China", "Beijing")); - assertEquals(1, entriesOnlyOnLeft.size()); - assertThat(entriesOnlyOnLeft, hasEntry("South Korea", "Seoul")); - } - - @Test - public void givenDifferentMaps_whenGetCommonEntriesUsingGuava_thenSuccess() { - Map asia1 = new HashMap(); - asia1.put("Japan", "Tokyo"); - asia1.put("South Korea", "Seoul"); - asia1.put("India", "New Delhi"); - - Map asia2 = new HashMap(); - asia2.put("Japan", "Tokyo"); - asia2.put("China", "Beijing"); - asia2.put("India", "Delhi"); - - MapDifference diff = Maps.difference(asia1, asia2); - Map entriesInCommon = diff.entriesInCommon(); - - assertEquals(1, entriesInCommon.size()); - assertThat(entriesInCommon, hasEntry("Japan", "Tokyo")); - } - - @Test - public void givenSimilarMapsWithArrayValue_whenCompareUsingGuava_thenFail() { - MapDifference diff = Maps.difference(asiaCity1, asiaCity2); - assertFalse(diff.areEqual()); - } - - @Test - public void givenSimilarMapsWithArrayValue_whenCompareUsingGuavaEquivalence_thenSuccess() { - Equivalence eq = new Equivalence() { - @Override - protected boolean doEquivalent(String[] a, String[] b) { - return Arrays.equals(a, b); - } - - @Override - protected int doHash(String[] value) { - return value.hashCode(); - } - }; - - MapDifference diff = Maps.difference(asiaCity1, asiaCity2, eq); - assertTrue(diff.areEqual()); - - diff = Maps.difference(asiaCity1, asiaCity3, eq); - assertFalse(diff.areEqual()); - } - - // =========================================================================== - - private boolean areEqual(Map first, Map second) { - if (first.size() != second.size()) { - return false; - } - - return first.entrySet() - .stream() - .allMatch(e -> e.getValue() - .equals(second.get(e.getKey()))); - } - - private boolean areEqualWithArrayValue(Map first, Map second) { - if (first.size() != second.size()) { - return false; - } - - return first.entrySet() - .stream() - .allMatch(e -> Arrays.equals(e.getValue(), second.get(e.getKey()))); - } - - private Map areEqualKeyValues(Map first, Map second) { - return first.entrySet() - .stream() - .collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue().equals(second.get(e.getKey())))); - } - -} diff --git a/java-collections-maps-3/src/test/java/com/baeldung/map/treemaphashmap/TreeMapVsHashMapUnitTest.java b/java-collections-maps-3/src/test/java/com/baeldung/map/treemaphashmap/TreeMapVsHashMapUnitTest.java deleted file mode 100644 index 1057e3b9f0..0000000000 --- a/java-collections-maps-3/src/test/java/com/baeldung/map/treemaphashmap/TreeMapVsHashMapUnitTest.java +++ /dev/null @@ -1,58 +0,0 @@ -package com.baeldung.map.treemaphashmap; - -import org.hamcrest.Matchers; -import org.junit.Assert; -import org.junit.Test; - -import java.util.HashMap; -import java.util.Map; -import java.util.TreeMap; - -public class TreeMapVsHashMapUnitTest { - - @Test - public void whenInsertObjectsTreeMap_thenNaturalOrder() { - Map treemap = new TreeMap<>(); - treemap.put(3, "TreeMap"); - treemap.put(2, "vs"); - treemap.put(1, "HashMap"); - Assert.assertThat(treemap.keySet(), Matchers.contains(1, 2, 3)); - } - - @Test(expected = NullPointerException.class) - public void whenInsertNullInTreeMap_thenException() { - Map treemap = new TreeMap<>(); - treemap.put(null, "NullPointerException"); - } - - @Test - public void whenInsertObjectsHashMap_thenRandomOrder() { - Map hashmap = new HashMap<>(); - hashmap.put(3, "TreeMap"); - hashmap.put(2, "vs"); - hashmap.put(1, "HashMap"); - Assert.assertThat(hashmap.keySet(), Matchers.containsInAnyOrder(1, 2, 3)); - } - - @Test - public void whenInsertNullInHashMap_thenInsertsNull() { - Map hashmap = new HashMap<>(); - hashmap.put(null, null); - Assert.assertNull(hashmap.get(null)); - } - - @Test - public void givenHashMapAndTreeMap_whenputDuplicates_thenOnlyUnique() { - Map treeMap = new HashMap<>(); - treeMap.put(1, "Baeldung"); - treeMap.put(1, "Baeldung"); - - Assert.assertTrue(treeMap.size() == 1); - - Map treeMap2 = new TreeMap<>(); - treeMap2.put(1, "Baeldung"); - treeMap2.put(1, "Baeldung"); - - Assert.assertTrue(treeMap2.size() == 1); - } -} \ No newline at end of file diff --git a/java-collections-maps/README.md b/java-collections-maps/README.md deleted file mode 100644 index 8fa6fa32fa..0000000000 --- a/java-collections-maps/README.md +++ /dev/null @@ -1,16 +0,0 @@ -## Java Collections Cookbooks and Examples - -This module contains articles about Map data structures in Java. - -### Relevant Articles: -- [Guide to the Guava BiMap](https://www.baeldung.com/guava-bimap) -- [A Guide to Java HashMap](https://www.baeldung.com/java-hashmap) -- [A Guide to LinkedHashMap in Java](https://www.baeldung.com/java-linked-hashmap) -- [A Guide to TreeMap in Java](https://www.baeldung.com/java-treemap) -- [How to Store Duplicate Keys in a Map in Java?](https://www.baeldung.com/java-map-duplicate-keys) -- [Get the Key for a Value from a Java Map](https://www.baeldung.com/java-map-key-from-value) -- [How to Check If a Key Exists in a Map](https://www.baeldung.com/java-map-key-exists) -- [Immutable Map Implementations in Java](https://www.baeldung.com/java-immutable-maps) -- [Guide to Apache Commons MultiValuedMap](https://www.baeldung.com/apache-commons-multi-valued-map) -- [The Java HashMap Under the Hood](https://www.baeldung.com/java-hashmap-advanced) -- More articles: [[next -->]](/java-collections-maps-2) diff --git a/java-collections-maps/pom.xml b/java-collections-maps/pom.xml deleted file mode 100644 index 38cf1c38ad..0000000000 --- a/java-collections-maps/pom.xml +++ /dev/null @@ -1,35 +0,0 @@ - - - 4.0.0 - java-collections-maps - 0.1.0-SNAPSHOT - java-collections-maps - jar - - - com.baeldung - parent-java - 0.0.1-SNAPSHOT - ../parent-java - - - - - org.apache.commons - commons-collections4 - ${commons-collections4.version} - - - org.assertj - assertj-core - ${assertj.version} - test - - - - - 4.1 - 3.6.1 - - diff --git a/java-collections-maps/src/main/java/com/baeldung/map/MapUtil.java b/java-collections-maps/src/main/java/com/baeldung/map/MapUtil.java deleted file mode 100644 index 91b7197a92..0000000000 --- a/java-collections-maps/src/main/java/com/baeldung/map/MapUtil.java +++ /dev/null @@ -1,44 +0,0 @@ -/** - * - */ -package com.baeldung.map; - -import java.util.HashSet; -import java.util.Map; -import java.util.Map.Entry; -import java.util.Set; -import java.util.stream.Stream; - -/** - * @author swpraman - * - */ -public class MapUtil { - - public static Stream keys(Map map, V value) { - return map.entrySet() - .stream() - .filter(entry -> value.equals(entry.getValue())) - .map(Map.Entry::getKey); - } - - public static Set getKeys(Map map, V value) { - Set keys = new HashSet<>(); - for (Entry entry : map.entrySet()) { - if (entry.getValue().equals(value)) { - keys.add(entry.getKey()); - } - } - return keys; - } - - public static K getKey(Map map, V value) { - for (Entry entry : map.entrySet()) { - if (entry.getValue().equals(value)) { - return entry.getKey(); - } - } - return null; - } - -} diff --git a/java-collections-maps/src/main/java/com/baeldung/map/MyKey.java b/java-collections-maps/src/main/java/com/baeldung/map/MyKey.java deleted file mode 100644 index 9993d7862c..0000000000 --- a/java-collections-maps/src/main/java/com/baeldung/map/MyKey.java +++ /dev/null @@ -1,64 +0,0 @@ -package com.baeldung.map; - -import org.slf4j.Logger; -import org.slf4j.LoggerFactory; - -public class MyKey { - private static final Logger LOG = LoggerFactory.getLogger(MyKey.class); - - private String name; - private int id; - - public MyKey(int id, String name) { - this.id = id; - this.name = name; - } - - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - public int getId() { - return id; - } - - public void setId(int id) { - this.id = id; - } - - @Override - public int hashCode() { - LOG.debug("Calling hashCode()"); - return id; - } - - @Override - public String toString() { - return "MyKey [name=" + name + ", id=" + id + "]"; - } - - @Override - public boolean equals(Object obj) { - LOG.debug("Calling equals() for key: " + obj); - if (this == obj) - return true; - if (obj == null) - return false; - if (getClass() != obj.getClass()) - return false; - MyKey other = (MyKey) obj; - if (id != other.id) - return false; - if (name == null) { - if (other.name != null) - return false; - } else if (!name.equals(other.name)) - return false; - return true; - } - -} diff --git a/java-collections-maps/src/main/java/com/baeldung/map/MyLinkedHashMap.java b/java-collections-maps/src/main/java/com/baeldung/map/MyLinkedHashMap.java deleted file mode 100644 index b687e57d85..0000000000 --- a/java-collections-maps/src/main/java/com/baeldung/map/MyLinkedHashMap.java +++ /dev/null @@ -1,23 +0,0 @@ -package com.baeldung.map; - -import java.util.LinkedHashMap; -import java.util.Map; - -public class MyLinkedHashMap extends LinkedHashMap { - - /** - * - */ - private static final long serialVersionUID = 1L; - private static final int MAX_ENTRIES = 5; - - public MyLinkedHashMap(int initialCapacity, float loadFactor, boolean accessOrder) { - super(initialCapacity, loadFactor, accessOrder); - } - - @Override - protected boolean removeEldestEntry(Map.Entry eldest) { - return size() > MAX_ENTRIES; - } - -} diff --git a/java-collections-maps/src/main/resources/logback.xml b/java-collections-maps/src/main/resources/logback.xml deleted file mode 100644 index 7d900d8ea8..0000000000 --- a/java-collections-maps/src/main/resources/logback.xml +++ /dev/null @@ -1,13 +0,0 @@ - - - - - %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n - - - - - - - - \ No newline at end of file diff --git a/java-collections-maps/src/test/java/com/baeldung/guava/GuavaBiMapUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/guava/GuavaBiMapUnitTest.java deleted file mode 100644 index b44d2db1aa..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/guava/GuavaBiMapUnitTest.java +++ /dev/null @@ -1,120 +0,0 @@ -package com.baeldung.guava; - -import static org.junit.Assert.*; -import java.util.HashMap; -import java.util.Map; -import org.junit.Test; -import com.google.common.collect.BiMap; -import com.google.common.collect.EnumHashBiMap; -import com.google.common.collect.HashBiMap; -import com.google.common.collect.ImmutableBiMap; - -public class GuavaBiMapUnitTest { - @Test - public void whenQueryByValue_returnsKey() { - final BiMap capitalCountryBiMap = HashBiMap.create(); - capitalCountryBiMap.put("New Delhi", "India"); - capitalCountryBiMap.put("Washingon, D.C.", "USA"); - capitalCountryBiMap.put("Moscow", "Russia"); - - final String countryCapitalName = capitalCountryBiMap.inverse().get("India"); - - assertEquals("New Delhi", countryCapitalName); - } - - @Test - public void whenCreateBiMapFromExistingMap_returnsKey() { - final Map capitalCountryMap = new HashMap<>(); - capitalCountryMap.put("New Delhi", "India"); - capitalCountryMap.put("Washingon, D.C.", "USA"); - capitalCountryMap.put("Moscow", "Russia"); - final BiMap capitalCountryBiMap = HashBiMap.create(capitalCountryMap); - - final String countryCapitalName = capitalCountryBiMap.inverse().get("India"); - - assertEquals("New Delhi", countryCapitalName); - } - - @Test - public void whenQueryByKey_returnsValue() { - final BiMap capitalCountryBiMap = HashBiMap.create(); - - capitalCountryBiMap.put("New Delhi", "India"); - capitalCountryBiMap.put("Washingon, D.C.", "USA"); - capitalCountryBiMap.put("Moscow", "Russia"); - - assertEquals("USA", capitalCountryBiMap.get("Washingon, D.C.")); - } - - @Test(expected = IllegalArgumentException.class) - public void whenSameValueIsPresent_throwsException() { - final BiMap capitalCountryBiMap = HashBiMap.create(); - - capitalCountryBiMap.put("New Delhi", "India"); - capitalCountryBiMap.put("Washingon, D.C.", "USA"); - capitalCountryBiMap.put("Moscow", "Russia"); - capitalCountryBiMap.put("Trump", "USA"); - } - - @Test - public void givenSameValueIsPresent_whenForcePut_completesSuccessfully() { - final BiMap capitalCountryBiMap = HashBiMap.create(); - - capitalCountryBiMap.put("New Delhi", "India"); - capitalCountryBiMap.put("Washingon, D.C.", "USA"); - capitalCountryBiMap.put("Moscow", "Russia"); - capitalCountryBiMap.forcePut("Trump", "USA"); - - assertEquals("USA", capitalCountryBiMap.get("Trump")); - assertEquals("Trump", capitalCountryBiMap.inverse().get("USA")); - } - - @Test - public void whenSameKeyIsPresent_replacesAlreadyPresent() { - final BiMap capitalCountryBiMap = HashBiMap.create(); - - capitalCountryBiMap.put("New Delhi", "India"); - capitalCountryBiMap.put("Washingon, D.C.", "USA"); - capitalCountryBiMap.put("Moscow", "Russia"); - capitalCountryBiMap.put("Washingon, D.C.", "HongKong"); - - assertEquals("HongKong", capitalCountryBiMap.get("Washingon, D.C.")); - } - - @Test - public void whenUsingImmutableBiMap_allowsPutSuccessfully() { - final BiMap capitalCountryBiMap = new ImmutableBiMap.Builder().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build(); - - assertEquals("USA", capitalCountryBiMap.get("Washingon, D.C.")); - } - - @Test(expected = UnsupportedOperationException.class) - public void whenUsingImmutableBiMap_doesntAllowRemove() { - final BiMap capitalCountryBiMap = new ImmutableBiMap.Builder().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build(); - - capitalCountryBiMap.remove("New Delhi"); - } - - @Test(expected = UnsupportedOperationException.class) - public void whenUsingImmutableBiMap_doesntAllowPut() { - final BiMap capitalCountryBiMap = new ImmutableBiMap.Builder().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build(); - - capitalCountryBiMap.put("New York", "USA"); - } - - private enum Operation { - ADD, SUBTRACT, MULTIPLY, DIVIDE - } - - @Test - public void whenUsingEnumAsKeyInMap_replacesAlreadyPresent() { - final BiMap operationStringBiMap = EnumHashBiMap.create(Operation.class); - - operationStringBiMap.put(Operation.ADD, "Add"); - operationStringBiMap.put(Operation.SUBTRACT, "Subtract"); - operationStringBiMap.put(Operation.MULTIPLY, "Multiply"); - operationStringBiMap.put(Operation.DIVIDE, "Divide"); - - assertEquals("Divide", operationStringBiMap.get(Operation.DIVIDE)); - } -} \ No newline at end of file diff --git a/java-collections-maps/src/test/java/com/baeldung/map/ImmutableMapUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/ImmutableMapUnitTest.java deleted file mode 100644 index d308aac7eb..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/ImmutableMapUnitTest.java +++ /dev/null @@ -1,84 +0,0 @@ -package com.baeldung.map; - -import com.google.common.collect.ImmutableMap; -import org.junit.jupiter.api.Test; - -import java.util.Collections; -import java.util.HashMap; -import java.util.Map; - -import static org.junit.jupiter.api.Assertions.*; - - -public class ImmutableMapUnitTest { - - @Test - public void whenCollectionsUnModifiableMapMethod_thenOriginalCollectionChangesReflectInUnmodifiableMap() { - - Map mutableMap = new HashMap<>(); - mutableMap.put("USA", "North America"); - - Map unmodifiableMap = Collections.unmodifiableMap(mutableMap); - assertThrows(UnsupportedOperationException.class, () -> unmodifiableMap.put("Canada", "North America")); - - mutableMap.remove("USA"); - assertFalse(unmodifiableMap.containsKey("USA")); - - mutableMap.put("Mexico", "North America"); - assertTrue(unmodifiableMap.containsKey("Mexico")); - } - - @Test - @SuppressWarnings("deprecation") - public void whenGuavaImmutableMapFromCopyOfMethod_thenOriginalCollectionChangesDoNotReflectInImmutableMap() { - - Map mutableMap = new HashMap<>(); - mutableMap.put("USA", "North America"); - - ImmutableMap immutableMap = ImmutableMap.copyOf(mutableMap); - assertTrue(immutableMap.containsKey("USA")); - - assertThrows(UnsupportedOperationException.class, () -> immutableMap.put("Canada", "North America")); - - mutableMap.remove("USA"); - assertTrue(immutableMap.containsKey("USA")); - - mutableMap.put("Mexico", "North America"); - assertFalse(immutableMap.containsKey("Mexico")); - } - - @Test - @SuppressWarnings("deprecation") - public void whenGuavaImmutableMapFromBuilderMethod_thenOriginalCollectionChangesDoNotReflectInImmutableMap() { - - Map mutableMap = new HashMap<>(); - mutableMap.put("USA", "North America"); - - ImmutableMap immutableMap = ImmutableMap.builder() - .putAll(mutableMap) - .put("Costa Rica", "North America") - .build(); - assertTrue(immutableMap.containsKey("USA")); - assertTrue(immutableMap.containsKey("Costa Rica")); - - assertThrows(UnsupportedOperationException.class, () -> immutableMap.put("Canada", "North America")); - - mutableMap.remove("USA"); - assertTrue(immutableMap.containsKey("USA")); - - mutableMap.put("Mexico", "North America"); - assertFalse(immutableMap.containsKey("Mexico")); - } - - @Test - @SuppressWarnings("deprecation") - public void whenGuavaImmutableMapFromOfMethod_thenOriginalCollectionChangesDoNotReflectInImmutableMap() { - - ImmutableMap immutableMap = ImmutableMap.of("USA", "North America", "Costa Rica", "North America"); - assertTrue(immutableMap.containsKey("USA")); - assertTrue(immutableMap.containsKey("Costa Rica")); - - assertThrows(UnsupportedOperationException.class, () -> immutableMap.put("Canada", "North America")); - } - -} diff --git a/java-collections-maps/src/test/java/com/baeldung/map/KeyCheckUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/KeyCheckUnitTest.java deleted file mode 100644 index dbad2e5b5e..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/KeyCheckUnitTest.java +++ /dev/null @@ -1,27 +0,0 @@ -package com.baeldung.map; - -import org.junit.Test; - -import java.util.Collections; -import java.util.Map; - -import static org.junit.Assert.*; - -public class KeyCheckUnitTest { - - @Test - public void whenKeyIsPresent_thenContainsKeyReturnsTrue() { - Map map = Collections.singletonMap("key", "value"); - - assertTrue(map.containsKey("key")); - assertFalse(map.containsKey("missing")); - } - - @Test - public void whenKeyHasNullValue_thenGetStillWorks() { - Map map = Collections.singletonMap("nothing", null); - - assertTrue(map.containsKey("nothing")); - assertNull(map.get("nothing")); - } -} \ No newline at end of file diff --git a/java-collections-maps/src/test/java/com/baeldung/map/MapMultipleValuesUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/MapMultipleValuesUnitTest.java deleted file mode 100644 index 721b48ea7b..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/MapMultipleValuesUnitTest.java +++ /dev/null @@ -1,119 +0,0 @@ -package com.baeldung.map; - -import com.google.common.collect.ArrayListMultimap; -import com.google.common.collect.LinkedHashMultimap; -import com.google.common.collect.Multimap; -import com.google.common.collect.TreeMultimap; -import org.apache.commons.collections4.MultiMap; -import org.apache.commons.collections4.MultiMapUtils; -import org.apache.commons.collections4.MultiValuedMap; -import org.apache.commons.collections4.map.MultiValueMap; -import org.apache.commons.collections4.multimap.ArrayListValuedHashMap; -import org.apache.commons.collections4.multimap.HashSetValuedHashMap; -import org.junit.Test; -import org.slf4j.Logger; -import org.slf4j.LoggerFactory; - -import java.util.*; - -import static org.assertj.core.api.Assertions.assertThat; - -public class MapMultipleValuesUnitTest { - private static final Logger LOG = LoggerFactory.getLogger(MapMultipleValuesUnitTest.class); - - @Test - public void givenHashMap_whenPuttingTwice_thenReturningFirstValue() { - Map map = new HashMap<>(); - assertThat(map.put("key1", "value1")).isEqualTo(null); - assertThat(map.put("key1", "value2")).isEqualTo("value1"); - assertThat(map.get("key1")).isEqualTo("value2"); - } - - @Test - public void givenCollectionAsValue_whenPuttingTwice_thenReturningCollection() { - Map> map = new HashMap<>(); - List list = new ArrayList<>(); - map.put("key1", list); - map.get("key1").add("value1"); - map.get("key1").add("value2"); - assertThat(map.get("key1").get(0)).isEqualTo("value1"); - assertThat(map.get("key1").get(1)).isEqualTo("value2"); - } - - @Test - public void givenCollectionAsValueAndJava8_whenPuttingTwice_thenReturningCollection() { - Map> map = new HashMap<>(); - map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value1"); - map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value2"); - assertThat(map.get("key1").get(0)).isEqualTo("value1"); - assertThat(map.get("key1").get(1)).isEqualTo("value2"); - } - - @Test - public void givenMultiValueMap_whenPuttingTwice_thenReturningValues() { - MultiMap map = new MultiValueMap<>(); - map.put("key1", "value1"); - map.put("key1", "value2"); - assertThat((Collection) map.get("key1")) - .contains("value1", "value2"); - } - - @Test - public void givenArrayListValuedHashMap_whenPuttingDoubleValues_thenReturningAllValues() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("key1", "value1"); - map.put("key1", "value2"); - map.put("key1", "value2"); - assertThat((Collection) map.get("key1")) - .containsExactly("value1", "value2", "value2"); - } - - @Test - public void givenHashSetValuedHashMap_whenPuttingTwiceTheSame_thenReturningOneValue() { - MultiValuedMap map = new HashSetValuedHashMap<>(); - map.put("key1", "value1"); - map.put("key1", "value1"); - assertThat((Collection) map.get("key1")) - .containsExactly("value1"); - } - - @Test(expected = UnsupportedOperationException.class) - public void givenUnmodifiableMultiValuedMap_whenInserting_thenThrowingException() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("key1", "value1"); - map.put("key1", "value2"); - MultiValuedMap immutableMap = - MultiMapUtils.unmodifiableMultiValuedMap(map); - immutableMap.put("key1", "value3"); - } - - @Test - public void givenArrayListMultiMap_whenInserting_thenCorrectOutput() { - Multimap map = ArrayListMultimap.create(); - map.put("key1", "value2"); - map.put("key1", "value1"); - assertThat((Collection) map.get("key1")) - .containsExactly("value2", "value1"); - } - - @Test - public void givenLinkedHashMultiMap_whenInserting_thenReturningValuesInInsertionOrder() { - Multimap map = LinkedHashMultimap.create(); - map.put("key1", "value3"); - map.put("key1", "value1"); - map.put("key1", "value2"); - assertThat((Collection) map.get("key1")) - .containsExactly("value3", "value1", "value2"); - } - - @Test - public void givenTreeMultimap_whenInserting_thenReturningValuesInNaturalOrder() { - Multimap map = TreeMultimap.create(); - map.put("key1", "value3"); - map.put("key1", "value1"); - map.put("key1", "value2"); - assertThat((Collection) map.get("key1")) - .containsExactly("value1", "value2", "value3"); - } - -} \ No newline at end of file diff --git a/java-collections-maps/src/test/java/com/baeldung/map/MapUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/MapUnitTest.java deleted file mode 100644 index eaf68ccba5..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/MapUnitTest.java +++ /dev/null @@ -1,336 +0,0 @@ -package com.baeldung.map; - -import org.junit.Test; -import org.slf4j.Logger; -import org.slf4j.LoggerFactory; - -import java.util.*; -import java.util.Map.Entry; - -import static org.junit.Assert.*; - -public class MapUnitTest { - private static final Logger LOG = LoggerFactory.getLogger(MapUnitTest.class); - - - @Test - public void givenHashMap_whenRetrievesKeyset_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - Set keys = map.keySet(); - - assertEquals(2, keys.size()); - assertTrue(keys.contains("name")); - assertTrue(keys.contains("type")); - } - - @Test - public void givenHashMap_whenRetrievesValues_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - Collection values = map.values(); - - assertEquals(2, values.size()); - assertTrue(values.contains("baeldung")); - assertTrue(values.contains("blog")); - } - - @Test - public void givenHashMap_whenRetrievesEntries_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - Set> entries = map.entrySet(); - - assertEquals(2, entries.size()); - for (Entry e : entries) { - String key = e.getKey(); - String val = e.getValue(); - assertTrue(key.equals("name") || key.equals("type")); - assertTrue(val.equals("baeldung") || val.equals("blog")); - } - } - - @Test - public void givenKeySet_whenChangeReflectsInMap_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - assertEquals(2, map.size()); - - Set keys = map.keySet(); - - keys.remove("name"); - assertEquals(1, map.size()); - } - - @Test(expected = ConcurrentModificationException.class) - public void givenIterator_whenFailsFastOnModification_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - Set keys = map.keySet(); - Iterator it = keys.iterator(); - map.remove("type"); - while (it.hasNext()) { - String key = it.next(); - } - } - - public void givenIterator_whenRemoveWorks_thenCorrect() { - Map map = new HashMap<>(); - map.put("name", "baeldung"); - map.put("type", "blog"); - - Set keys = map.keySet(); - Iterator it = keys.iterator(); - while (it.hasNext()) { - it.next(); - it.remove(); - } - assertEquals(0, map.size()); - } - - @Test - public void whenHashCodeIsCalledOnPut_thenCorrect() { - MyKey key = new MyKey(1, "name"); - Map map = new HashMap<>(); - map.put(key, "val"); - } - - @Test - public void whenHashCodeIsCalledOnGet_thenCorrect() { - MyKey key = new MyKey(1, "name"); - Map map = new HashMap<>(); - map.put(key, "val"); - map.get(key); - } - - @Test - public void whenGetWorks_thenCorrect() { - Map map = new HashMap<>(); - map.put("key", "val"); - - String val = map.get("key"); - - assertEquals("val", val); - } - - @Test - public void givenNewKey_whenPutReturnsNull_thenCorrect() { - Map map = new HashMap<>(); - - String rtnVal = map.put("key1", "val1"); - - assertNull(rtnVal); - } - - @Test - public void givenUnmappedKey_whenGetReturnsNull_thenCorrect() { - Map map = new HashMap<>(); - - String rtnVal = map.get("key1"); - - assertNull(rtnVal); - } - - @Test - public void givenNullVal_whenPutReturnsNull_thenCorrect() { - Map map = new HashMap<>(); - - String rtnVal = map.put("key1", null); - - assertNull(rtnVal); - } - - @Test - public void givenNullKeyAndVal_whenAccepts_thenCorrect() { - Map map = new HashMap<>(); - - map.put(null, null); - } - - @Test - public void givenNullVal_whenRetrieves_thenCorrect() { - Map map = new HashMap<>(); - map.put("key", null); - - String val = map.get("key"); - - assertNull(val); - } - - @Test - public void whenContainsDistinguishesNullValues_thenCorrect() { - Map map = new HashMap<>(); - - String val1 = map.get("key"); - boolean valPresent = map.containsKey("key"); - - assertNull(val1); - assertFalse(valPresent); - - map.put("key", null); - String val = map.get("key"); - valPresent = map.containsKey("key"); - - assertNull(val); - assertTrue(valPresent); - - } - - @Test - public void whenPutReturnsPrevValue_thenCorrect() { - Map map = new HashMap<>(); - map.put("key1", "val1"); - String rtnVal = map.put("key1", "val2"); - - assertEquals("val1", rtnVal); - } - - @Test - public void whenCallsEqualsOnCollision_thenCorrect() { - HashMap map = new HashMap<>(); - MyKey k1 = new MyKey(1, "firstKey"); - MyKey k2 = new MyKey(2, "secondKey"); - MyKey k3 = new MyKey(2, "thirdKey"); - - LOG.debug("storing value for k1"); - map.put(k1, "firstValue"); - - LOG.debug("storing value for k2"); - map.put(k2, "secondValue"); - - LOG.debug("storing value for k3"); - map.put(k3, "thirdValue"); - - LOG.debug("retrieving value for k1"); - String v1 = map.get(k1); - - LOG.debug("retrieving value for k2"); - String v2 = map.get(k2); - - LOG.debug("retrieving value for k3"); - String v3 = map.get(k3); - - assertEquals("firstValue", v1); - assertEquals("secondValue", v2); - assertEquals("thirdValue", v3); - - } - - @Test - public void givenLinkedHashMap_whenGetsOrderedKeyset_thenCorrect() { - LinkedHashMap map = new LinkedHashMap<>(); - map.put(1, null); - map.put(2, null); - map.put(3, null); - map.put(4, null); - map.put(5, null); - Set keys = map.keySet(); - Integer[] arr = keys.toArray(new Integer[0]); - for (int i = 0; i < arr.length; i++) { - assertEquals(new Integer(i + 1), arr[i]); - - } - } - - @Test - public void givenLinkedHashMap_whenAccessOrderWorks_thenCorrect() { - LinkedHashMap map = new LinkedHashMap<>(16, .75f, true); - map.put(1, null); - map.put(2, null); - map.put(3, null); - map.put(4, null); - map.put(5, null); - Set keys = map.keySet(); - assertEquals("[1, 2, 3, 4, 5]", keys.toString()); - map.get(4); - assertEquals("[1, 2, 3, 5, 4]", keys.toString()); - map.get(1); - assertEquals("[2, 3, 5, 4, 1]", keys.toString()); - map.get(3); - assertEquals("[2, 5, 4, 1, 3]", keys.toString()); - } - - @Test - public void givenLinkedHashMap_whenRemovesEldestEntry_thenCorrect() { - LinkedHashMap map = new MyLinkedHashMap<>(16, .75f, true); - map.put(1, null); - map.put(2, null); - map.put(3, null); - map.put(4, null); - map.put(5, null); - Set keys = map.keySet(); - assertEquals("[1, 2, 3, 4, 5]", keys.toString()); - map.put(6, null); - assertEquals("[2, 3, 4, 5, 6]", keys.toString()); - map.put(7, null); - assertEquals("[3, 4, 5, 6, 7]", keys.toString()); - map.put(8, null); - assertEquals("[4, 5, 6, 7, 8]", keys.toString()); - } - - @Test - public void givenTreeMap_whenOrdersEntriesNaturally_thenCorrect() { - TreeMap map = new TreeMap<>(); - map.put(3, "val"); - map.put(2, "val"); - map.put(1, "val"); - map.put(5, "val"); - map.put(4, "val"); - assertEquals("[1, 2, 3, 4, 5]", map.keySet().toString()); - } - - @Test - public void givenTreeMap_whenOrdersEntriesNaturally_thenCorrect2() { - TreeMap map = new TreeMap<>(); - map.put("c", "val"); - map.put("b", "val"); - map.put("a", "val"); - map.put("e", "val"); - map.put("d", "val"); - - assertEquals("[a, b, c, d, e]", map.keySet().toString()); - } - - @Test - public void givenTreeMap_whenOrdersEntriesByComparator_thenCorrect() { - TreeMap map = new TreeMap<>(Comparator.reverseOrder()); - map.put(3, "val"); - map.put(2, "val"); - map.put(1, "val"); - map.put(5, "val"); - map.put(4, "val"); - - assertEquals("[5, 4, 3, 2, 1]", map.keySet().toString()); - } - - @Test - public void givenTreeMap_whenPerformsQueries_thenCorrect() { - TreeMap map = new TreeMap<>(); - map.put(3, "val"); - map.put(2, "val"); - map.put(1, "val"); - map.put(5, "val"); - map.put(4, "val"); - - Integer highestKey = map.lastKey(); - Integer lowestKey = map.firstKey(); - Set keysLessThan3 = map.headMap(3).keySet(); - Set keysGreaterThanEqTo3 = map.tailMap(3).keySet(); - - assertEquals(new Integer(5), highestKey); - assertEquals(new Integer(1), lowestKey); - assertEquals("[1, 2]", keysLessThan3.toString()); - assertEquals("[3, 4, 5]", keysGreaterThanEqTo3.toString()); - } - -} diff --git a/java-collections-maps/src/test/java/com/baeldung/map/MapUtilUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/MapUtilUnitTest.java deleted file mode 100644 index f8e4c8fd8a..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/MapUtilUnitTest.java +++ /dev/null @@ -1,103 +0,0 @@ -/** - * - */ -package com.baeldung.map; - -import com.google.common.collect.HashBiMap; -import org.apache.commons.collections4.BidiMap; -import org.apache.commons.collections4.bidimap.DualHashBidiMap; -import org.junit.Test; - -import java.util.Arrays; -import java.util.HashMap; -import java.util.HashSet; -import java.util.Map; -import java.util.stream.Collectors; - -import static org.junit.Assert.assertEquals; - -/** - * @author swpraman - * - */ -public class MapUtilUnitTest { - - - @Test - public void whenUsingImperativeWayForSingleKey_shouldReturnSingleKey() { - Map capitalCountryMap = new HashMap<>(); - capitalCountryMap.put("Tokyo", "Japan"); - capitalCountryMap.put("New Delhi", "India"); - assertEquals("New Delhi", MapUtil.getKey(capitalCountryMap, "India")); - } - - @Test - public void whenUsingImperativeWayForAllKeys_shouldReturnAllKeys() { - Map capitalCountryMap = new HashMap<>(); - capitalCountryMap.put("Tokyo", "Japan"); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - capitalCountryMap.put("Pretoria", "South Africa"); - capitalCountryMap.put("Bloemfontein", "South Africa"); - - assertEquals(new HashSet(Arrays.asList( - new String[] {"Cape Town", "Pretoria", "Bloemfontein"})), - MapUtil.getKeys(capitalCountryMap, "South Africa")); - } - - @Test - public void whenUsingFunctionalWayForSingleKey_shouldReturnSingleKey() { - Map capitalCountryMap = new HashMap<>(); - capitalCountryMap.put("Tokyo", "Japan"); - capitalCountryMap.put("Berlin", "Germany"); - assertEquals("Berlin", MapUtil.keys(capitalCountryMap, "Germany").findFirst().get()); - } - - @Test - public void whenUsingFunctionalWayForAllKeys_shouldReturnAllKeys() { - Map capitalCountryMap = new HashMap<>(); - capitalCountryMap.put("Tokyo", "Japan"); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - capitalCountryMap.put("Pretoria", "South Africa"); - capitalCountryMap.put("Bloemfontein", "South Africa"); - assertEquals(new HashSet(Arrays.asList( - new String[] {"Cape Town", "Pretoria", "Bloemfontein"})), - MapUtil.keys(capitalCountryMap, "South Africa").collect(Collectors.toSet())); - } - - @Test - public void whenUsingBidiMap_shouldReturnKey() { - BidiMap capitalCountryMap = new DualHashBidiMap(); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - assertEquals("Berlin", capitalCountryMap.getKey("Germany")); - } - - @Test - public void whenUsingBidiMapAddDuplicateValue_shouldRemoveOldEntry() { - BidiMap capitalCountryMap = new DualHashBidiMap(); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - capitalCountryMap.put("Pretoria", "South Africa"); - assertEquals("Pretoria", capitalCountryMap.getKey("South Africa")); - } - - @Test - public void whenUsingBiMap_shouldReturnKey() { - HashBiMap capitalCountryMap = HashBiMap.create(); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - assertEquals("Berlin", capitalCountryMap.inverse().get("Germany")); - } - - @Test(expected=IllegalArgumentException.class) - public void whenUsingBiMapAddDuplicateValue_shouldThrowException() { - HashBiMap capitalCountryMap = HashBiMap.create(); - capitalCountryMap.put("Berlin", "Germany"); - capitalCountryMap.put("Cape Town", "South Africa"); - capitalCountryMap.put("Pretoria", "South Africa"); - assertEquals("Berlin", capitalCountryMap.inverse().get("Germany")); - } - -} diff --git a/java-collections-maps/src/test/java/com/baeldung/map/MultiValuedMapUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/MultiValuedMapUnitTest.java deleted file mode 100644 index 686c1cef87..0000000000 --- a/java-collections-maps/src/test/java/com/baeldung/map/MultiValuedMapUnitTest.java +++ /dev/null @@ -1,227 +0,0 @@ -package com.baeldung.map; - -import org.apache.commons.collections4.MultiMapUtils; -import org.apache.commons.collections4.MultiSet; -import org.apache.commons.collections4.MultiValuedMap; -import org.apache.commons.collections4.multimap.ArrayListValuedHashMap; -import org.apache.commons.collections4.multimap.HashSetValuedHashMap; -import org.junit.Test; - -import java.util.Arrays; -import java.util.Collection; -import java.util.Map; -import java.util.Map.Entry; -import java.util.Set; - -import static org.assertj.core.api.Assertions.assertThat; -import static org.junit.Assert.assertTrue; -import static org.junit.jupiter.api.Assertions.assertEquals; -import static org.junit.jupiter.api.Assertions.assertFalse; - -public class MultiValuedMapUnitTest { - - @Test - public void givenMultiValuesMap_whenPuttingMultipleValuesUsingPutMethod_thenReturningAllValues() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.put("fruits", "apple"); - map.put("fruits", "orange"); - - assertThat((Collection) map.get("fruits")).containsExactly("apple", "orange"); - - } - - @Test - public void givenMultiValuesMap_whenPuttingMultipleValuesUsingPutAllMethod_thenReturningAllValues() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.putAll("vehicles", Arrays.asList("car", "bike")); - - assertThat((Collection) map.get("vehicles")).containsExactly("car", "bike"); - - } - - @Test - public void givenMultiValuesMap_whenGettingValueUsingGetMethod_thenReturningValue() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.put("fruits", "apple"); - - assertThat((Collection) map.get("fruits")).containsExactly("apple"); - } - - @Test - public void givenMultiValuesMap_whenUsingEntriesMethod_thenReturningMappings() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - - Collection> entries = (Collection>) map.entries(); - - for(Map.Entry entry : entries) { - assertThat(entry.getKey()).contains("fruits"); - assertTrue(entry.getValue().equals("apple") || entry.getValue().equals("orange") ); - } - } - - @Test - public void givenMultiValuesMap_whenUsingKeysMethod_thenReturningAllKeys() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - MultiSet keys = map.keys(); - - assertThat((keys)).contains("fruits", "vehicles"); - - } - - @Test - public void givenMultiValuesMap_whenUsingKeySetMethod_thenReturningAllKeys() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - Set keys = map.keySet(); - - assertThat(keys).contains("fruits", "vehicles"); - - } - - @Test - public void givenMultiValuesMap_whenUsingValuesMethod_thenReturningAllValues() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - assertThat(((Collection) map.values())).contains("apple", "orange", "car", "bike"); - } - - @Test - public void givenMultiValuesMap_whenUsingRemoveMethod_thenReturningUpdatedMap() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - assertThat(((Collection) map.values())).contains("apple", "orange", "car", "bike"); - - map.remove("fruits"); - - assertThat(((Collection) map.values())).contains("car", "bike"); - - } - - @Test - public void givenMultiValuesMap_whenUsingRemoveMappingMethod_thenReturningUpdatedMapAfterMappingRemoved() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - assertThat(((Collection) map.values())).contains("apple", "orange", "car", "bike"); - - map.removeMapping("fruits", "apple"); - - assertThat(((Collection) map.values())).contains("orange", "car", "bike"); - } - - @Test - public void givenMultiValuesMap_whenUsingClearMethod_thenReturningEmptyMap() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - assertThat(((Collection) map.values())).contains("apple", "orange", "car", "bike"); - - map.clear(); - - assertTrue(map.isEmpty()); - } - - @Test - public void givenMultiValuesMap_whenUsingContainsKeyMethod_thenReturningTrue() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - assertTrue(map.containsKey("fruits")); - } - - @Test - public void givenMultiValuesMap_whenUsingContainsValueMethod_thenReturningTrue() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - assertTrue(map.containsValue("orange")); - } - - @Test - public void givenMultiValuesMap_whenUsingIsEmptyMethod_thenReturningFalse() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - assertFalse(map.isEmpty()); - } - - @Test - public void givenMultiValuesMap_whenUsingSizeMethod_thenReturningElementCount() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("vehicles", "car"); - map.put("vehicles", "bike"); - - assertEquals(4, map.size()); - } - - @Test - public void givenArrayListValuedHashMap_whenPuttingDoubleValues_thenReturningAllValues() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - map.put("fruits", "orange"); - - assertThat((Collection) map.get("fruits")).containsExactly("apple", "orange", "orange"); - } - - @Test - public void givenHashSetValuedHashMap_whenPuttingTwiceTheSame_thenReturningOneValue() { - MultiValuedMap map = new HashSetValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "apple"); - - assertThat((Collection) map.get("fruits")).containsExactly("apple"); - } - - @Test(expected = UnsupportedOperationException.class) - public void givenUnmodifiableMultiValuedMap_whenInserting_thenThrowingException() { - MultiValuedMap map = new ArrayListValuedHashMap<>(); - map.put("fruits", "apple"); - map.put("fruits", "orange"); - MultiValuedMap immutableMap = MultiMapUtils.unmodifiableMultiValuedMap(map); - - immutableMap.put("fruits", "banana"); - - } - - -}