diff --git a/core-java-modules/core-java-9-streams/README.md b/core-java-modules/core-java-9-streams/README.md new file mode 100644 index 0000000000..0ad8500689 --- /dev/null +++ b/core-java-modules/core-java-9-streams/README.md @@ -0,0 +1,6 @@ +## Core Java 9 streams + +This module contains articles about Java 9 streams + +### Relevant Articles: +- [How to Break from Java Stream forEach](https://www.baeldung.com/java-break-stream-foreach) diff --git a/core-java-modules/core-java-9-streams/pom.xml b/core-java-modules/core-java-9-streams/pom.xml new file mode 100644 index 0000000000..6e167caf9c --- /dev/null +++ b/core-java-modules/core-java-9-streams/pom.xml @@ -0,0 +1,31 @@ + + 4.0.0 + core-java-9-streams + 0.1.0-SNAPSHOT + core-java-9-streams + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../../parent-java + + + + + + + core-java-9-streams + + + src/main/resources + true + + + + + + + diff --git a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomForEach.java b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomForEach.java similarity index 94% rename from java-streams-2/src/main/java/com/baeldung/breakforeach/CustomForEach.java rename to core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomForEach.java index 1f8866b16c..357571f092 100644 --- a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomForEach.java +++ b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomForEach.java @@ -1,4 +1,4 @@ -package com.baeldung.breakforeach; +package com.baeldung.streams.breakforeach; import java.util.Spliterator; import java.util.function.BiConsumer; diff --git a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomSpliterator.java b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomSpliterator.java similarity index 95% rename from java-streams-2/src/main/java/com/baeldung/breakforeach/CustomSpliterator.java rename to core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomSpliterator.java index cfe4bedac3..1844a3dc37 100644 --- a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomSpliterator.java +++ b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomSpliterator.java @@ -1,4 +1,4 @@ -package com.baeldung.breakforeach; +package com.baeldung.streams.breakforeach; import java.util.Spliterator; import java.util.Spliterators; diff --git a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomTakeWhile.java b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomTakeWhile.java similarity index 90% rename from java-streams-2/src/main/java/com/baeldung/breakforeach/CustomTakeWhile.java rename to core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomTakeWhile.java index 05574f9ae6..1852df3d9c 100644 --- a/java-streams-2/src/main/java/com/baeldung/breakforeach/CustomTakeWhile.java +++ b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/CustomTakeWhile.java @@ -1,4 +1,4 @@ -package com.baeldung.breakforeach; +package com.baeldung.streams.breakforeach; import java.util.function.Predicate; import java.util.stream.Stream; diff --git a/java-streams-2/src/main/java/com/baeldung/breakforeach/TakeWhileExample.java b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/TakeWhileExample.java similarity index 94% rename from java-streams-2/src/main/java/com/baeldung/breakforeach/TakeWhileExample.java rename to core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/TakeWhileExample.java index 1838ae5fb7..3a16c9d691 100644 --- a/java-streams-2/src/main/java/com/baeldung/breakforeach/TakeWhileExample.java +++ b/core-java-modules/core-java-9-streams/src/main/java/com/baeldung/streams/breakforeach/TakeWhileExample.java @@ -1,4 +1,4 @@ -package com.baeldung.breakforeach; +package com.baeldung.streams.breakforeach; import java.util.List; import java.util.stream.Stream; diff --git a/java-streams-2/src/test/java/com/baeldung/breakforeach/BreakFromStreamForEachUnitTest.java b/core-java-modules/core-java-9-streams/src/test/java/com/baeldung/streams/breakforeach/BreakFromStreamForEachUnitTest.java similarity index 96% rename from java-streams-2/src/test/java/com/baeldung/breakforeach/BreakFromStreamForEachUnitTest.java rename to core-java-modules/core-java-9-streams/src/test/java/com/baeldung/streams/breakforeach/BreakFromStreamForEachUnitTest.java index 23653c0a39..66d293b3fa 100644 --- a/java-streams-2/src/test/java/com/baeldung/breakforeach/BreakFromStreamForEachUnitTest.java +++ b/core-java-modules/core-java-9-streams/src/test/java/com/baeldung/streams/breakforeach/BreakFromStreamForEachUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.breakforeach; +package com.baeldung.streams.breakforeach; import org.junit.Test; diff --git a/core-java-modules/core-java-streams-2/README.md b/core-java-modules/core-java-streams-2/README.md new file mode 100644 index 0000000000..2ff95045c3 --- /dev/null +++ b/core-java-modules/core-java-streams-2/README.md @@ -0,0 +1,16 @@ +## Core Java streams + +This module contains articles about the Stream API in Java. + +### Relevant Articles: +- [The Java 8 Stream API Tutorial](https://www.baeldung.com/java-8-streams) +- [Introduction to Java 8 Streams](https://www.baeldung.com/java-8-streams-introduction) +- [Java 8 Stream findFirst() vs. findAny()](https://www.baeldung.com/java-stream-findfirst-vs-findany) +- [Guide to Stream.reduce()](https://www.baeldung.com/java-stream-reduce) +- [Java IntStream Conversions](https://www.baeldung.com/java-intstream-convert) +- [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api) +- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams) +- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection) +- [How to Add a Single Element to a Stream](https://www.baeldung.com/java-stream-append-prepend) +- [Operating on and Removing an Item from Stream](https://www.baeldung.com/java-use-remove-item-stream) +- More articles: [[<-- prev>]](/../core-java-streams) [[next -->]](/../core-java-streams-3) diff --git a/java-streams-2/pom.xml b/core-java-modules/core-java-streams-2/pom.xml similarity index 84% rename from java-streams-2/pom.xml rename to core-java-modules/core-java-streams-2/pom.xml index 4cebd44427..20c028edaa 100644 --- a/java-streams-2/pom.xml +++ b/core-java-modules/core-java-streams-2/pom.xml @@ -1,49 +1,53 @@ - - - 4.0.0 - com.baeldung.javastreams2 - java-streams-2 - 1.0 - java-streams-2 - jar - - - com.baeldung - parent-java - 0.0.1-SNAPSHOT - ../parent-java - - - - - org.openjdk.jmh - jmh-core - ${jmh-core.version} - - - org.openjdk.jmh - jmh-generator-annprocess - ${jmh-generator.version} - - - junit - junit - ${junit.version} - test - jar - - - org.assertj - assertj-core - ${assertj.version} - test - - - - - UTF-8 - 1.9 - 1.9 - 3.11.1 - + + + 4.0.0 + core-java-streams-2 + 1.0 + core-java-streams-2 + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../../parent-java + + + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + + + log4j + log4j + ${log4j.version} + + + junit + junit + ${junit.version} + test + jar + + + org.assertj + assertj-core + ${assertj.version} + test + + + + + UTF-8 + 1.9 + 1.9 + 3.11.1 + \ No newline at end of file diff --git a/java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java similarity index 97% rename from java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java rename to core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java index 79c557524d..62d080c32c 100644 --- a/java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/application/Application.java @@ -1,39 +1,39 @@ -package com.baeldung.reduce.application; - -import com.baeldung.reduce.entities.User; -import com.baeldung.reduce.utilities.NumberUtils; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.List; - -public class Application { - - public static void main(String[] args) { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result1 = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); - System.out.println(result1); - - int result2 = numbers.stream().reduce(0, Integer::sum); - System.out.println(result2); - - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result3 = letters.stream().reduce("", (partialString, element) -> partialString + element); - System.out.println(result3); - - String result4 = letters.stream().reduce("", String::concat); - System.out.println(result4); - - String result5 = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); - System.out.println(result5); - - List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); - int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - System.out.println(result6); - - String result7 = letters.parallelStream().reduce("", String::concat); - System.out.println(result7); - - int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - System.out.println(result8); - } -} +package com.baeldung.reduce.application; + +import com.baeldung.reduce.entities.User; +import com.baeldung.reduce.utilities.NumberUtils; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +public class Application { + + public static void main(String[] args) { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result1 = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); + System.out.println(result1); + + int result2 = numbers.stream().reduce(0, Integer::sum); + System.out.println(result2); + + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result3 = letters.stream().reduce("", (partialString, element) -> partialString + element); + System.out.println(result3); + + String result4 = letters.stream().reduce("", String::concat); + System.out.println(result4); + + String result5 = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); + System.out.println(result5); + + List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); + int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + System.out.println(result6); + + String result7 = letters.parallelStream().reduce("", String::concat); + System.out.println(result7); + + int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + System.out.println(result8); + } +} diff --git a/java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java similarity index 97% rename from java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java rename to core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java index af4a9276a9..ecb0347e96 100644 --- a/java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/benchmarks/JMHStreamReduceBenchMark.java @@ -1,52 +1,52 @@ -package com.baeldung.reduce.benchmarks; - -import com.baeldung.reduce.entities.User; -import java.util.ArrayList; -import java.util.List; -import org.openjdk.jmh.annotations.Benchmark; -import org.openjdk.jmh.annotations.BenchmarkMode; -import org.openjdk.jmh.annotations.Mode; -import org.openjdk.jmh.annotations.Scope; -import org.openjdk.jmh.annotations.State; -import org.openjdk.jmh.runner.Runner; -import org.openjdk.jmh.runner.RunnerException; -import org.openjdk.jmh.runner.options.Options; -import org.openjdk.jmh.runner.options.OptionsBuilder; - -@State(Scope.Thread) -@BenchmarkMode(Mode.AverageTime) -public class JMHStreamReduceBenchMark { - - private final List userList = createUsers(); - - public static void main(String[] args) throws RunnerException { - - Options options = new OptionsBuilder() - .include(JMHStreamReduceBenchMark.class.getSimpleName()).threads(1) - .forks(1).shouldFailOnError(true).shouldDoGC(true) - .jvmArgs("-server").build(); - new Runner(options).run(); - } - - private List createUsers() { - List users = new ArrayList<>(); - for (int i = 0; i <= 1000000; i++) { - users.add(new User("John" + i, i)); - } - return users; - } - - @Benchmark - public Integer executeReduceOnParallelizedStream() { - return this.userList - .parallelStream() - .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - } - - @Benchmark - public Integer executeReduceOnSequentialStream() { - return this.userList - .stream() - .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - } -} +package com.baeldung.reduce.benchmarks; + +import com.baeldung.reduce.entities.User; +import java.util.ArrayList; +import java.util.List; +import org.openjdk.jmh.annotations.Benchmark; +import org.openjdk.jmh.annotations.BenchmarkMode; +import org.openjdk.jmh.annotations.Mode; +import org.openjdk.jmh.annotations.Scope; +import org.openjdk.jmh.annotations.State; +import org.openjdk.jmh.runner.Runner; +import org.openjdk.jmh.runner.RunnerException; +import org.openjdk.jmh.runner.options.Options; +import org.openjdk.jmh.runner.options.OptionsBuilder; + +@State(Scope.Thread) +@BenchmarkMode(Mode.AverageTime) +public class JMHStreamReduceBenchMark { + + private final List userList = createUsers(); + + public static void main(String[] args) throws RunnerException { + + Options options = new OptionsBuilder() + .include(JMHStreamReduceBenchMark.class.getSimpleName()).threads(1) + .forks(1).shouldFailOnError(true).shouldDoGC(true) + .jvmArgs("-server").build(); + new Runner(options).run(); + } + + private List createUsers() { + List users = new ArrayList<>(); + for (int i = 0; i <= 1000000; i++) { + users.add(new User("John" + i, i)); + } + return users; + } + + @Benchmark + public Integer executeReduceOnParallelizedStream() { + return this.userList + .parallelStream() + .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + } + + @Benchmark + public Integer executeReduceOnSequentialStream() { + return this.userList + .stream() + .reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + } +} diff --git a/java-streams/src/main/java/com/baeldung/reduce/entities/User.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java similarity index 94% rename from java-streams/src/main/java/com/baeldung/reduce/entities/User.java rename to core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java index a17c6a02b6..6e0a529de6 100644 --- a/java-streams/src/main/java/com/baeldung/reduce/entities/User.java +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java @@ -1,25 +1,25 @@ -package com.baeldung.reduce.entities; - -public class User { - - private final String name; - private final int age; - - public User(String name, int age) { - this.name = name; - this.age = age; - } - - public String getName() { - return name; - } - - public int getAge() { - return age; - } - - @Override - public String toString() { - return "User{" + "name=" + name + ", age=" + age + '}'; - } -} +package com.baeldung.reduce.entities; + +public class User { + + private final String name; + private final int age; + + public User(String name, int age) { + this.name = name; + this.age = age; + } + + public String getName() { + return name; + } + + public int getAge() { + return age; + } + + @Override + public String toString() { + return "User{" + "name=" + name + ", age=" + age + '}'; + } +} diff --git a/java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java similarity index 97% rename from java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java rename to core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java index a7a4b8df29..38d5b50120 100644 --- a/java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java @@ -1,52 +1,52 @@ -package com.baeldung.reduce.utilities; - -import java.util.List; -import java.util.function.BiFunction; -import java.util.logging.Level; -import java.util.logging.Logger; - -public abstract class NumberUtils { - - private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName()); - - public static int divideListElements(List values, Integer divider) { - return values.stream() - .reduce(0, (a, b) -> { - try { - return a / divider + b / divider; - } catch (ArithmeticException e) { - LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); - } - return 0; - }); - } - - public static int divideListElementsWithExtractedTryCatchBlock(List values, int divider) { - return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider)); - } - - public static int divideListElementsWithApplyFunctionMethod(List values, int divider) { - BiFunction division = (a, b) -> a / b; - return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider)); - } - - private static int divide(int value, int factor) { - int result = 0; - try { - result = value / factor; - } catch (ArithmeticException e) { - LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); - } - return result; - } - - private static int applyFunction(BiFunction function, int a, int b) { - try { - return function.apply(a, b); - } - catch(Exception e) { - LOGGER.log(Level.INFO, "Exception thrown!"); - } - return 0; - } -} +package com.baeldung.reduce.utilities; + +import java.util.List; +import java.util.function.BiFunction; +import java.util.logging.Level; +import java.util.logging.Logger; + +public abstract class NumberUtils { + + private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName()); + + public static int divideListElements(List values, Integer divider) { + return values.stream() + .reduce(0, (a, b) -> { + try { + return a / divider + b / divider; + } catch (ArithmeticException e) { + LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); + } + return 0; + }); + } + + public static int divideListElementsWithExtractedTryCatchBlock(List values, int divider) { + return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider)); + } + + public static int divideListElementsWithApplyFunctionMethod(List values, int divider) { + BiFunction division = (a, b) -> a / b; + return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider)); + } + + private static int divide(int value, int factor) { + int result = 0; + try { + result = value / factor; + } catch (ArithmeticException e) { + LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); + } + return result; + } + + private static int applyFunction(BiFunction function, int a, int b) { + try { + return function.apply(a, b); + } + catch(Exception e) { + LOGGER.log(Level.INFO, "Exception thrown!"); + } + return 0; + } +} diff --git a/java-streams/src/test/java/com/baeldung/stream/mycollectors/MyImmutableListCollector.java b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java similarity index 93% rename from java-streams/src/test/java/com/baeldung/stream/mycollectors/MyImmutableListCollector.java rename to core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java index cf6b3601c3..6d515bfb46 100644 --- a/java-streams/src/test/java/com/baeldung/stream/mycollectors/MyImmutableListCollector.java +++ b/core-java-modules/core-java-streams-2/src/main/java/com/baeldung/streams/MyImmutableListCollector.java @@ -1,4 +1,4 @@ -package com.baeldung.stream.mycollectors; +package com.baeldung.streams; import java.util.ArrayList; import java.util.Collections; diff --git a/java-streams/src/main/resources/logback.xml b/core-java-modules/core-java-streams-2/src/main/resources/logback.xml similarity index 100% rename from java-streams/src/main/resources/logback.xml rename to core-java-modules/core-java-streams-2/src/main/resources/logback.xml diff --git a/java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java similarity index 100% rename from java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/convert/intstreams/IntStreamsConversionsUnitTest.java diff --git a/java-streams-2/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java similarity index 95% rename from java-streams-2/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java index 564d614017..21eedf953e 100644 --- a/java-streams-2/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/reduce/StreamReduceUnitTest.java @@ -1,79 +1,80 @@ -package com.baeldung.reduce.tests; - -import com.baeldung.reduce.entities.User; -import com.baeldung.reduce.utilities.NumberUtils; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.List; -import static org.assertj.core.api.Assertions.assertThat; -import org.junit.Test; - -public class StreamReduceUnitTest { - - @Test - public void givenIntegerList_whenReduceWithSumAccumulatorLambda_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); - assertThat(result).isEqualTo(21); - } - - @Test - public void givenIntegerList_whenReduceWithSumAccumulatorMethodReference_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result = numbers.stream().reduce(0, Integer::sum); - assertThat(result).isEqualTo(21); - } - - @Test - public void givenStringList_whenReduceWithConcatenatorAccumulatorLambda_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", (partialString, element) -> partialString + element); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenStringList_whenReduceWithConcatenatorAccumulatorMethodReference_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", String::concat); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenStringList_whenReduceWithUppercaseConcatenatorAccumulator_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); - assertThat(result).isEqualTo("ABCDE"); - } - - @Test - public void givenUserList_whenReduceWithAgeAccumulatorAndSumCombiner_thenCorrect() { - List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); - int result = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - assertThat(result).isEqualTo(65); - } - - @Test - public void givenStringList_whenReduceWithParallelStream_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.parallelStream().reduce("", String::concat); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenNumberUtilsClass_whenCalledDivideListElements_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElements(numbers, 1)).isEqualTo(21); - } - - @Test - public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlock_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21); - } - - @Test - public void givenStream_whneCalleddivideListElementsWithApplyFunctionMethod_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElementsWithApplyFunctionMethod(numbers, 1)).isEqualTo(21); - } -} +package com.baeldung.reduce; + +import com.baeldung.reduce.entities.User; +import com.baeldung.reduce.utilities.NumberUtils; +import org.junit.Test; + +import java.util.Arrays; +import java.util.List; + +import static org.assertj.core.api.Assertions.assertThat; + +public class StreamReduceUnitTest { + + @Test + public void givenIntegerList_whenReduceWithSumAccumulatorLambda_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); + assertThat(result).isEqualTo(21); + } + + @Test + public void givenIntegerList_whenReduceWithSumAccumulatorMethodReference_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + int result = numbers.stream().reduce(0, Integer::sum); + assertThat(result).isEqualTo(21); + } + + @Test + public void givenStringList_whenReduceWithConcatenatorAccumulatorLambda_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", (partialString, element) -> partialString + element); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenStringList_whenReduceWithConcatenatorAccumulatorMethodReference_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", String::concat); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenStringList_whenReduceWithUppercaseConcatenatorAccumulator_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); + assertThat(result).isEqualTo("ABCDE"); + } + + @Test + public void givenUserList_whenReduceWithAgeAccumulatorAndSumCombiner_thenCorrect() { + List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); + int result = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); + assertThat(result).isEqualTo(65); + } + + @Test + public void givenStringList_whenReduceWithParallelStream_thenCorrect() { + List letters = Arrays.asList("a", "b", "c", "d", "e"); + String result = letters.parallelStream().reduce("", String::concat); + assertThat(result).isEqualTo("abcde"); + } + + @Test + public void givenNumberUtilsClass_whenCalledDivideListElements_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElements(numbers, 1)).isEqualTo(21); + } + + @Test + public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlock_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21); + } + + @Test + public void givenStream_whneCalleddivideListElementsWithApplyFunctionMethod_thenCorrect() { + List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); + assertThat(NumberUtils.divideListElementsWithApplyFunctionMethod(numbers, 1)).isEqualTo(21); + } +} diff --git a/java-streams/src/main/java/com/baeldung/java_8_features/Detail.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java similarity index 85% rename from java-streams/src/main/java/com/baeldung/java_8_features/Detail.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java index 811937dba7..d2f5774b24 100644 --- a/java-streams/src/main/java/com/baeldung/java_8_features/Detail.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Detail.java @@ -1,4 +1,4 @@ -package com.baeldung.java_8_features; +package com.baeldung.streams; import java.util.Arrays; import java.util.List; diff --git a/java-streams/src/test/java/com/baeldung/java8/streams/Java8FindAnyFindFirstUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java similarity index 97% rename from java-streams/src/test/java/com/baeldung/java8/streams/Java8FindAnyFindFirstUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java index 5f52fe375e..934d7b3542 100644 --- a/java-streams/src/test/java/com/baeldung/java8/streams/Java8FindAnyFindFirstUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8FindAnyFindFirstUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.java8.streams; +package com.baeldung.streams; import org.junit.Test; diff --git a/java-streams/src/test/java/com/baeldung/java8/streams/Java8StreamApiUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java similarity index 99% rename from java-streams/src/test/java/com/baeldung/java8/streams/Java8StreamApiUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java index 75cfbc049f..c4e1f2b3cb 100644 --- a/java-streams/src/test/java/com/baeldung/java8/streams/Java8StreamApiUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java @@ -1,6 +1,5 @@ -package com.baeldung.java8.streams; +package com.baeldung.streams; -import com.baeldung.stream.Product; import org.junit.Before; import org.junit.Test; import org.slf4j.Logger; diff --git a/java-streams/src/test/java/com/baeldung/java8/Java8StreamsUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java similarity index 97% rename from java-streams/src/test/java/com/baeldung/java8/Java8StreamsUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java index e40f9f9506..f46fa79b08 100644 --- a/java-streams/src/test/java/com/baeldung/java8/Java8StreamsUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamsUnitTest.java @@ -1,6 +1,5 @@ -package com.baeldung.java8; +package com.baeldung.streams; -import com.baeldung.java_8_features.Detail; import org.junit.Before; import org.junit.Test; diff --git a/java-streams/src/test/java/com/baeldung/stream/PeekUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java similarity index 98% rename from java-streams/src/test/java/com/baeldung/stream/PeekUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java index a3a2816e9c..97af4149d3 100644 --- a/java-streams/src/test/java/com/baeldung/stream/PeekUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/PeekUnitTest.java @@ -1,13 +1,13 @@ -package com.baeldung.stream; +package com.baeldung.streams; -import static org.assertj.core.api.Assertions.assertThat; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; import java.io.StringWriter; import java.util.stream.Collectors; import java.util.stream.Stream; -import org.junit.jupiter.api.BeforeEach; -import org.junit.jupiter.api.Test; +import static org.assertj.core.api.Assertions.assertThat; public class PeekUnitTest { diff --git a/java-streams/src/main/java/com/baeldung/stream/Product.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java similarity index 96% rename from java-streams/src/main/java/com/baeldung/stream/Product.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java index e99a969b81..7883f055a1 100644 --- a/java-streams/src/main/java/com/baeldung/stream/Product.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Product.java @@ -1,4 +1,4 @@ -package com.baeldung.stream; +package com.baeldung.streams; import java.util.List; import java.util.stream.Stream; diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamAddUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java similarity index 97% rename from java-streams/src/test/java/com/baeldung/stream/StreamAddUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java index d0745b8bc9..1fada26de5 100644 --- a/java-streams/src/test/java/com/baeldung/stream/StreamAddUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamAddUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.stream; +package com.baeldung.streams; import org.junit.Test; diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamMapUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java similarity index 96% rename from java-streams/src/test/java/com/baeldung/stream/StreamMapUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java index 5cb2a274d1..509a3a3569 100644 --- a/java-streams/src/test/java/com/baeldung/stream/StreamMapUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamMapUnitTest.java @@ -1,16 +1,13 @@ -package com.baeldung.stream; +package com.baeldung.streams; import org.junit.Before; import org.junit.Test; -import java.util.Collection; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Optional; -import java.util.Set; import java.util.stream.Collectors; -import java.util.stream.Stream; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertTrue; diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamToImmutableUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java similarity index 81% rename from java-streams/src/test/java/com/baeldung/stream/StreamToImmutableUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java index bd540201d2..e5339d8327 100644 --- a/java-streams/src/test/java/com/baeldung/stream/StreamToImmutableUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/StreamToImmutableUnitTest.java @@ -1,20 +1,12 @@ -package com.baeldung.stream; - -import static java.util.stream.Collectors.collectingAndThen; -import static java.util.stream.Collectors.toList; -import static java.util.stream.Collectors.toSet; - -import java.util.ArrayList; -import java.util.Arrays; -import java.util.Collections; -import java.util.LinkedList; -import java.util.List; -import java.util.stream.IntStream; +package com.baeldung.streams; +import com.google.common.collect.ImmutableList; import org.junit.Test; -import com.baeldung.stream.mycollectors.MyImmutableListCollector; -import com.google.common.collect.ImmutableList; +import java.util.*; +import java.util.stream.IntStream; + +import static java.util.stream.Collectors.*; public class StreamToImmutableUnitTest { diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamOperateAndRemoveUnitTest.java b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java similarity index 98% rename from java-streams/src/test/java/com/baeldung/stream/StreamOperateAndRemoveUnitTest.java rename to core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java index c5aa9a1651..194d0bd4d6 100644 --- a/java-streams/src/test/java/com/baeldung/stream/StreamOperateAndRemoveUnitTest.java +++ b/core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/removeitem/StreamOperateAndRemoveUnitTest.java @@ -1,9 +1,4 @@ -package com.baeldung.stream; - -import java.util.ArrayList; -import java.util.List; -import java.util.function.Predicate; -import java.util.stream.Collectors; +package com.baeldung.streams.removeitem; import org.junit.Assert; import org.junit.Before; @@ -11,6 +6,11 @@ import org.junit.Test; import org.slf4j.Logger; import org.slf4j.LoggerFactory; +import java.util.ArrayList; +import java.util.List; +import java.util.function.Predicate; +import java.util.stream.Collectors; + public class StreamOperateAndRemoveUnitTest { private List itemList; diff --git a/core-java-modules/core-java-streams-3/README.md b/core-java-modules/core-java-streams-3/README.md new file mode 100644 index 0000000000..4b2c9ed94c --- /dev/null +++ b/core-java-modules/core-java-streams-3/README.md @@ -0,0 +1,11 @@ +## Core Java streams + +This module contains articles about the Stream API in Java. + +### Relevant Articles: +- [The Difference Between map() and flatMap()](https://www.baeldung.com/java-difference-map-and-flatmap) +- [How to Use if/else Logic in Java 8 Streams](https://www.baeldung.com/java-8-streams-if-else-logic) +- [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach) +- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors) +- [Primitive Type Streams in Java 8](https://www.baeldung.com/java-8-primitive-streams) +- More articles: [[<-- prev>]](/../core-java-streams-2) \ No newline at end of file diff --git a/core-java-modules/core-java-streams-3/pom.xml b/core-java-modules/core-java-streams-3/pom.xml new file mode 100644 index 0000000000..b5b21a4368 --- /dev/null +++ b/core-java-modules/core-java-streams-3/pom.xml @@ -0,0 +1,53 @@ + + 4.0.0 + core-java-streams-3 + 0.1.0-SNAPSHOT + core-java-streams-3 + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../../parent-java + + + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + org.projectlombok + lombok + ${lombok.version} + provided + + + + org.assertj + assertj-core + ${assertj.version} + test + + + + + core-java-streams-3 + + + src/main/resources + true + + + + + + + 3.6.1 + + 2.22.1 + + diff --git a/core-java-modules/core-java-streams/src/main/java/com/baeldung/forEach/ReverseList.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java similarity index 98% rename from core-java-modules/core-java-streams/src/main/java/com/baeldung/forEach/ReverseList.java rename to core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java index b2ce77a9f6..c4128d9b72 100644 --- a/core-java-modules/core-java-streams/src/main/java/com/baeldung/forEach/ReverseList.java +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/forEach/ReverseList.java @@ -1,4 +1,4 @@ -package com.baeldung.forEach; +package com.baeldung.streams.forEach; import java.util.ArrayList; import java.util.Arrays; diff --git a/java-streams/src/main/java/com/baeldung/stream/PrimitiveStreams.java b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java similarity index 90% rename from java-streams/src/main/java/com/baeldung/stream/PrimitiveStreams.java rename to core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java index b0afb65a35..fb2001f10f 100644 --- a/java-streams/src/main/java/com/baeldung/stream/PrimitiveStreams.java +++ b/core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/primitivestreams/PrimitiveStreams.java @@ -1,4 +1,4 @@ -package com.baeldung.stream; +package com.baeldung.streams.primitivestreams; import java.util.Arrays; import java.util.stream.IntStream; diff --git a/core-java-modules/core-java-streams-3/src/main/resources/logback.xml b/core-java-modules/core-java-streams-3/src/main/resources/logback.xml new file mode 100644 index 0000000000..7d900d8ea8 --- /dev/null +++ b/core-java-modules/core-java-streams-3/src/main/resources/logback.xml @@ -0,0 +1,13 @@ + + + + + %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n + + + + + + + + \ No newline at end of file diff --git a/core-java-modules/core-java-streams/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/collectors/Java8CollectorsUnitTest.java similarity index 99% rename from core-java-modules/core-java-streams/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java rename to core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/collectors/Java8CollectorsUnitTest.java index e742635758..6afc9f4182 100644 --- a/core-java-modules/core-java-streams/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/collectors/Java8CollectorsUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.collectors; +package com.baeldung.streams.collectors; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableSet; diff --git a/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/conditional/StreamForEachIfElseUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java similarity index 96% rename from core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/conditional/StreamForEachIfElseUnitTest.java rename to core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java index b5d26eb6a8..a49a092864 100644 --- a/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/conditional/StreamForEachIfElseUnitTest.java +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/conditional/StreamForEachIfElseUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.stream.conditional; +package com.baeldung.streams.conditional; import java.util.Arrays; import java.util.List; diff --git a/java-streams/src/test/java/com/baeldung/stream/PrimitiveStreamsUnitTest.java b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java similarity index 98% rename from java-streams/src/test/java/com/baeldung/stream/PrimitiveStreamsUnitTest.java rename to core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java index 67954f0bba..18966425e4 100644 --- a/java-streams/src/test/java/com/baeldung/stream/PrimitiveStreamsUnitTest.java +++ b/core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/primitivestreams/PrimitiveStreamsUnitTest.java @@ -1,14 +1,14 @@ -package com.baeldung.stream; +package com.baeldung.streams.primitivestreams; -import static org.junit.Assert.assertEquals; -import static org.junit.Assert.assertTrue; +import org.junit.Test; import java.util.List; import java.util.stream.Collectors; import java.util.stream.IntStream; import java.util.stream.Stream; -import org.junit.Test; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; public class PrimitiveStreamsUnitTest { diff --git a/java-streams/.gitignore b/core-java-modules/core-java-streams/.gitignore similarity index 100% rename from java-streams/.gitignore rename to core-java-modules/core-java-streams/.gitignore diff --git a/core-java-modules/core-java-streams/README.md b/core-java-modules/core-java-streams/README.md index e97641c221..e556c231fe 100644 --- a/core-java-modules/core-java-streams/README.md +++ b/core-java-modules/core-java-streams/README.md @@ -1,9 +1,16 @@ -========= +## Core Java streams -## Core Java 8 Cookbooks and Examples +This module contains articles about the Stream API in Java. ### Relevant Articles: -- [The Difference Between map() and flatMap()](https://www.baeldung.com/java-difference-map-and-flatmap) -- [How to Use if/else Logic in Java 8 Streams](https://www.baeldung.com/java-8-streams-if-else-logic) -- [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach) -- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors) \ No newline at end of file +- [Java 8 and Infinite Streams](https://www.baeldung.com/java-inifinite-streams) +- [How to Get the Last Element of a Stream in Java?](https://www.baeldung.com/java-stream-last-element) +- [“Stream has already been operated upon or closed” Exception in Java](https://www.baeldung.com/java-stream-operated-upon-or-closed-exception) +- [Iterable to Stream in Java](https://www.baeldung.com/java-iterable-to-stream) +- [How to Iterate Over a Stream With Indices](https://www.baeldung.com/java-stream-indices) +- [Stream Ordering in Java](https://www.baeldung.com/java-stream-ordering) +- [Introduction to Protonpack](https://www.baeldung.com/java-protonpack) +- [Java Stream Filter with Lambda Expression](https://www.baeldung.com/java-stream-filter-lambda) +- [Counting Matches on a Stream Filter](https://www.baeldung.com/java-stream-filter-count) +- [Summing Numbers with Java Streams](https://www.baeldung.com/java-stream-sum) +- More articles: [[next -->]](/../core-java-streams-2) \ No newline at end of file diff --git a/core-java-modules/core-java-streams/pom.xml b/core-java-modules/core-java-streams/pom.xml index 96d97f3759..9b68c8dded 100644 --- a/core-java-modules/core-java-streams/pom.xml +++ b/core-java-modules/core-java-streams/pom.xml @@ -14,6 +14,34 @@ + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + provided + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + log4j + log4j + ${log4j.version} + + + org.projectlombok + lombok + ${lombok.version} + provided + org.assertj @@ -21,6 +49,36 @@ ${assertj.version} test + + com.codepoetics + protonpack + ${protonpack.version} + + + io.vavr + vavr + ${vavr.version} + + + one.util + streamex + ${streamex.version} + + + org.aspectj + aspectjrt + ${asspectj.version} + + + org.aspectj + aspectjweaver + ${asspectj.version} + + + pl.touk + throwing-function + ${throwing-function.version} + @@ -31,10 +89,33 @@ true + + + + org.apache.maven.plugins + maven-compiler-plugin + ${maven-compiler-plugin.version} + + ${maven.compiler.source} + ${maven.compiler.target} + -parameters + + + + + 0.9.0 + 1.15 + 0.6.5 + 2.10 + 1.3 - 3.6.1 + 3.11.1 + 1.8.9 + 3.1 + 1.8 + 1.8 diff --git a/java-streams/src/main/java/com/baeldung/stream/InfiniteStreams.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/InfiniteStreams.java similarity index 100% rename from java-streams/src/main/java/com/baeldung/stream/InfiniteStreams.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/InfiniteStreams.java diff --git a/java-streams/src/main/java/com/baeldung/stream/StreamApi.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/StreamApi.java similarity index 100% rename from java-streams/src/main/java/com/baeldung/stream/StreamApi.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/StreamApi.java diff --git a/java-streams/src/main/java/com/baeldung/stream/StreamIndices.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/StreamIndices.java similarity index 100% rename from java-streams/src/main/java/com/baeldung/stream/StreamIndices.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/StreamIndices.java diff --git a/java-streams/src/main/java/com/baeldung/stream/filter/Customer.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/filter/Customer.java similarity index 100% rename from java-streams/src/main/java/com/baeldung/stream/filter/Customer.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/filter/Customer.java diff --git a/java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java similarity index 94% rename from java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java index 3170b1fb31..c44aaf8005 100644 --- a/java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java +++ b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/ArithmeticUtils.java @@ -1,8 +1,8 @@ -package com.baeldung.stream.sum; - -public class ArithmeticUtils { - - public static int add(int a, int b) { - return a + b; - } -} +package com.baeldung.stream.sum; + +public class ArithmeticUtils { + + public static int add(int a, int b) { + return a + b; + } +} diff --git a/java-streams/src/main/java/com/baeldung/stream/sum/Item.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/Item.java similarity index 94% rename from java-streams/src/main/java/com/baeldung/stream/sum/Item.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/Item.java index 2f162d6eda..28a1737db8 100644 --- a/java-streams/src/main/java/com/baeldung/stream/sum/Item.java +++ b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/Item.java @@ -1,31 +1,31 @@ -package com.baeldung.stream.sum; - -public class Item { - - private int id; - private Integer price; - - public Item(int id, Integer price) { - super(); - this.id = id; - this.price = price; - } - - // Standard getters and setters - public long getId() { - return id; - } - - public void setId(int id) { - this.id = id; - } - - public Integer getPrice() { - return price; - } - - public void setPrice(Integer price) { - this.price = price; - } - -} +package com.baeldung.stream.sum; + +public class Item { + + private int id; + private Integer price; + + public Item(int id, Integer price) { + super(); + this.id = id; + this.price = price; + } + + // Standard getters and setters + public long getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public Integer getPrice() { + return price; + } + + public void setPrice(Integer price) { + this.price = price; + } + +} diff --git a/java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java similarity index 96% rename from java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java index 2f63cf8629..ea6459d360 100644 --- a/java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java +++ b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculator.java @@ -1,59 +1,59 @@ -package com.baeldung.stream.sum; - -import java.util.Arrays; -import java.util.List; -import java.util.Map; -import java.util.stream.Collectors; - -public class StreamSumCalculator { - - public static Integer getSumUsingCustomizedAccumulator(List integers) { - return integers.stream() - .reduce(0, ArithmeticUtils::add); - - } - - public static Integer getSumUsingJavaAccumulator(List integers) { - return integers.stream() - .reduce(0, Integer::sum); - - } - - public static Integer getSumUsingReduce(List integers) { - return integers.stream() - .reduce(0, (a, b) -> a + b); - - } - - public static Integer getSumUsingCollect(List integers) { - - return integers.stream() - .collect(Collectors.summingInt(Integer::intValue)); - - } - - public static Integer getSumUsingSum(List integers) { - - return integers.stream() - .mapToInt(Integer::intValue) - .sum(); - } - - public static Integer getSumOfMapValues(Map map) { - - return map.values() - .stream() - .mapToInt(Integer::valueOf) - .sum(); - } - - public static Integer getSumIntegersFromString(String str) { - - Integer sum = Arrays.stream(str.split(" ")) - .filter((s) -> s.matches("\\d+")) - .mapToInt(Integer::valueOf) - .sum(); - - return sum; - } -} +package com.baeldung.stream.sum; + +import java.util.Arrays; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; + +public class StreamSumCalculator { + + public static Integer getSumUsingCustomizedAccumulator(List integers) { + return integers.stream() + .reduce(0, ArithmeticUtils::add); + + } + + public static Integer getSumUsingJavaAccumulator(List integers) { + return integers.stream() + .reduce(0, Integer::sum); + + } + + public static Integer getSumUsingReduce(List integers) { + return integers.stream() + .reduce(0, (a, b) -> a + b); + + } + + public static Integer getSumUsingCollect(List integers) { + + return integers.stream() + .collect(Collectors.summingInt(Integer::intValue)); + + } + + public static Integer getSumUsingSum(List integers) { + + return integers.stream() + .mapToInt(Integer::intValue) + .sum(); + } + + public static Integer getSumOfMapValues(Map map) { + + return map.values() + .stream() + .mapToInt(Integer::valueOf) + .sum(); + } + + public static Integer getSumIntegersFromString(String str) { + + Integer sum = Arrays.stream(str.split(" ")) + .filter((s) -> s.matches("\\d+")) + .mapToInt(Integer::valueOf) + .sum(); + + return sum; + } +} diff --git a/java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java similarity index 96% rename from java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java rename to core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java index b83616928e..8a162429d2 100644 --- a/java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java +++ b/core-java-modules/core-java-streams/src/main/java/com/baeldung/stream/sum/StreamSumCalculatorWithObject.java @@ -1,38 +1,38 @@ -package com.baeldung.stream.sum; - -import java.util.List; -import java.util.stream.Collectors; - -public class StreamSumCalculatorWithObject { - - public static Integer getSumUsingCustomizedAccumulator(List items) { - return items.stream() - .map(x -> x.getPrice()) - .reduce(0, ArithmeticUtils::add); - } - - public static Integer getSumUsingJavaAccumulator(List items) { - return items.stream() - .map(x -> x.getPrice()) - .reduce(0, Integer::sum); - } - - public static Integer getSumUsingReduce(List items) { - return items.stream() - .map(item -> item.getPrice()) - .reduce(0, (a, b) -> a + b); - } - - public static Integer getSumUsingCollect(List items) { - return items.stream() - .map(x -> x.getPrice()) - .collect(Collectors.summingInt(Integer::intValue)); - } - - public static Integer getSumUsingSum(List items) { - return items.stream() - .mapToInt(x -> x.getPrice()) - .sum(); - } - -} +package com.baeldung.stream.sum; + +import java.util.List; +import java.util.stream.Collectors; + +public class StreamSumCalculatorWithObject { + + public static Integer getSumUsingCustomizedAccumulator(List items) { + return items.stream() + .map(x -> x.getPrice()) + .reduce(0, ArithmeticUtils::add); + } + + public static Integer getSumUsingJavaAccumulator(List items) { + return items.stream() + .map(x -> x.getPrice()) + .reduce(0, Integer::sum); + } + + public static Integer getSumUsingReduce(List items) { + return items.stream() + .map(item -> item.getPrice()) + .reduce(0, (a, b) -> a + b); + } + + public static Integer getSumUsingCollect(List items) { + return items.stream() + .map(x -> x.getPrice()) + .collect(Collectors.summingInt(Integer::intValue)); + } + + public static Integer getSumUsingSum(List items) { + return items.stream() + .mapToInt(x -> x.getPrice()) + .sum(); + } + +} diff --git a/java-streams/src/test/java/com/baeldung/java/conversion/IterableStreamConversionUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/conversion/IterableStreamConversionUnitTest.java similarity index 96% rename from java-streams/src/test/java/com/baeldung/java/conversion/IterableStreamConversionUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/conversion/IterableStreamConversionUnitTest.java index 99e8088054..f65f91a768 100644 --- a/java-streams/src/test/java/com/baeldung/java/conversion/IterableStreamConversionUnitTest.java +++ b/core-java-modules/core-java-streams/src/test/java/com/baeldung/conversion/IterableStreamConversionUnitTest.java @@ -1,4 +1,4 @@ -package com.baeldung.java.conversion; +package com.baeldung.conversion; import org.junit.Assert; import org.junit.Test; diff --git a/java-streams/src/test/java/com/baeldung/protonpack/ProtonpackUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/protonpack/ProtonpackUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/protonpack/ProtonpackUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/protonpack/ProtonpackUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/InfiniteStreamUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/InfiniteStreamUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/stream/InfiniteStreamUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/InfiniteStreamUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamApiUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/StreamApiUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/stream/StreamApiUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/StreamApiUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/StreamIndicesUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/StreamIndicesUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/stream/StreamIndicesUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/StreamIndicesUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java similarity index 97% rename from java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java index a496e18b2d..69edc4f535 100644 --- a/java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java +++ b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/SupplierStreamUnitTest.java @@ -1,35 +1,35 @@ -package com.baeldung.stream; - -import static org.junit.Assert.fail; - -import java.util.Optional; -import java.util.function.Supplier; -import java.util.stream.Stream; - -import org.junit.Test; - -public class SupplierStreamUnitTest { - - @Test(expected = IllegalStateException.class) - public void givenStream_whenStreamUsedTwice_thenThrowException() { - Stream stringStream = Stream.of("A", "B", "C", "D"); - Optional result1 = stringStream.findAny(); - System.out.println(result1.get()); - Optional result2 = stringStream.findFirst(); - System.out.println(result2.get()); - } - - @Test - public void givenStream_whenUsingSupplier_thenNoExceptionIsThrown() { - try { - Supplier> streamSupplier = () -> Stream.of("A", "B", "C", "D"); - Optional result1 = streamSupplier.get().findAny(); - System.out.println(result1.get()); - Optional result2 = streamSupplier.get().findFirst(); - System.out.println(result2.get()); - } catch (IllegalStateException e) { - fail(); - } - } - +package com.baeldung.stream; + +import static org.junit.Assert.fail; + +import java.util.Optional; +import java.util.function.Supplier; +import java.util.stream.Stream; + +import org.junit.Test; + +public class SupplierStreamUnitTest { + + @Test(expected = IllegalStateException.class) + public void givenStream_whenStreamUsedTwice_thenThrowException() { + Stream stringStream = Stream.of("A", "B", "C", "D"); + Optional result1 = stringStream.findAny(); + System.out.println(result1.get()); + Optional result2 = stringStream.findFirst(); + System.out.println(result2.get()); + } + + @Test + public void givenStream_whenUsingSupplier_thenNoExceptionIsThrown() { + try { + Supplier> streamSupplier = () -> Stream.of("A", "B", "C", "D"); + Optional result1 = streamSupplier.get().findAny(); + System.out.println(result1.get()); + Optional result2 = streamSupplier.get().findFirst(); + System.out.println(result2.get()); + } catch (IllegalStateException e) { + fail(); + } + } + } \ No newline at end of file diff --git a/java-streams/src/test/java/com/baeldung/stream/filter/StreamCountUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/filter/StreamCountUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/stream/filter/StreamCountUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/filter/StreamCountUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/filter/StreamFilterUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/filter/StreamFilterUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/stream/filter/StreamFilterUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/filter/StreamFilterUnitTest.java diff --git a/java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java similarity index 97% rename from java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java index 46e1af9a4a..f03703154a 100644 --- a/java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java +++ b/core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/sum/StreamSumUnitTest.java @@ -1,136 +1,136 @@ -package com.baeldung.stream.sum; - -import static org.junit.jupiter.api.Assertions.assertEquals; - -import java.util.Arrays; -import java.util.HashMap; -import java.util.List; -import java.util.Map; - -import org.junit.jupiter.api.Test; - -public class StreamSumUnitTest { - - @Test - public void givenListOfIntegersWhenSummingUsingCustomizedAccumulatorThenCorrectValueReturned() { - List integers = Arrays.asList(1, 2, 3, 4, 5); - Integer sum = StreamSumCalculator.getSumUsingCustomizedAccumulator(integers); - assertEquals(15, sum.intValue()); - - } - - @Test - public void givenListOfIntegersWhenSummingUsingJavaAccumulatorThenCorrectValueReturned() { - List integers = Arrays.asList(1, 2, 3, 4, 5); - Integer sum = StreamSumCalculator.getSumUsingJavaAccumulator(integers); - assertEquals(15, sum.intValue()); - } - - @Test - public void givenListOfIntegersWhenSummingUsingReduceThenCorrectValueReturned() { - List integers = Arrays.asList(1, 2, 3, 4, 5); - Integer sum = StreamSumCalculator.getSumUsingReduce(integers); - assertEquals(15, sum.intValue()); - } - - @Test - public void givenListOfIntegersWhenSummingUsingCollectThenCorrectValueReturned() { - List integers = Arrays.asList(1, 2, 3, 4, 5); - Integer sum = StreamSumCalculator.getSumUsingCollect(integers); - assertEquals(15, sum.intValue()); - } - - @Test - public void givenListOfIntegersWhenSummingUsingSumThenCorrectValueReturned() { - List integers = Arrays.asList(1, 2, 3, 4, 5); - Integer sum = StreamSumCalculator.getSumUsingSum(integers); - assertEquals(15, sum.intValue()); - } - - @Test - public void givenListOfItemsWhenSummingUsingCustomizedAccumulatorThenCorrectValueReturned() { - Item item1 = new Item(1, 10); - Item item2 = new Item(2, 15); - Item item3 = new Item(3, 25); - Item item4 = new Item(4, 40); - - List items = Arrays.asList(item1, item2, item3, item4); - - Integer sum = StreamSumCalculatorWithObject.getSumUsingCustomizedAccumulator(items); - assertEquals(90, sum.intValue()); - - } - - @Test - public void givenListOfItemsWhenSummingUsingJavaAccumulatorThenCorrectValueReturned() { - Item item1 = new Item(1, 10); - Item item2 = new Item(2, 15); - Item item3 = new Item(3, 25); - Item item4 = new Item(4, 40); - - List items = Arrays.asList(item1, item2, item3, item4); - - Integer sum = StreamSumCalculatorWithObject.getSumUsingJavaAccumulator(items); - assertEquals(90, sum.intValue()); - } - - @Test - public void givenListOfItemsWhenSummingUsingReduceThenCorrectValueReturned() { - Item item1 = new Item(1, 10); - Item item2 = new Item(2, 15); - Item item3 = new Item(3, 25); - Item item4 = new Item(4, 40); - - List items = Arrays.asList(item1, item2, item3, item4); - - Integer sum = StreamSumCalculatorWithObject.getSumUsingReduce(items); - assertEquals(90, sum.intValue()); - } - - @Test - public void givenListOfItemsWhenSummingUsingCollectThenCorrectValueReturned() { - Item item1 = new Item(1, 10); - Item item2 = new Item(2, 15); - Item item3 = new Item(3, 25); - Item item4 = new Item(4, 40); - - List items = Arrays.asList(item1, item2, item3, item4); - - Integer sum = StreamSumCalculatorWithObject.getSumUsingCollect(items); - assertEquals(90, sum.intValue()); - } - - @Test - public void givenListOfItemsWhenSummingUsingSumThenCorrectValueReturned() { - Item item1 = new Item(1, 10); - Item item2 = new Item(2, 15); - Item item3 = new Item(3, 25); - Item item4 = new Item(4, 40); - - List items = Arrays.asList(item1, item2, item3, item4); - - Integer sum = StreamSumCalculatorWithObject.getSumUsingSum(items); - assertEquals(90, sum.intValue()); - } - - @Test - public void givenMapWhenSummingThenCorrectValueReturned() { - Map map = new HashMap(); - map.put(1, 10); - map.put(2, 15); - map.put(3, 25); - map.put(4, 40); - - Integer sum = StreamSumCalculator.getSumOfMapValues(map); - assertEquals(90, sum.intValue()); - } - - @Test - public void givenStringWhenSummingThenCorrectValueReturned() { - String string = "Item1 10 Item2 25 Item3 30 Item4 45"; - - Integer sum = StreamSumCalculator.getSumIntegersFromString(string); - assertEquals(110, sum.intValue()); - } - -} +package com.baeldung.stream.sum; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import org.junit.jupiter.api.Test; + +public class StreamSumUnitTest { + + @Test + public void givenListOfIntegersWhenSummingUsingCustomizedAccumulatorThenCorrectValueReturned() { + List integers = Arrays.asList(1, 2, 3, 4, 5); + Integer sum = StreamSumCalculator.getSumUsingCustomizedAccumulator(integers); + assertEquals(15, sum.intValue()); + + } + + @Test + public void givenListOfIntegersWhenSummingUsingJavaAccumulatorThenCorrectValueReturned() { + List integers = Arrays.asList(1, 2, 3, 4, 5); + Integer sum = StreamSumCalculator.getSumUsingJavaAccumulator(integers); + assertEquals(15, sum.intValue()); + } + + @Test + public void givenListOfIntegersWhenSummingUsingReduceThenCorrectValueReturned() { + List integers = Arrays.asList(1, 2, 3, 4, 5); + Integer sum = StreamSumCalculator.getSumUsingReduce(integers); + assertEquals(15, sum.intValue()); + } + + @Test + public void givenListOfIntegersWhenSummingUsingCollectThenCorrectValueReturned() { + List integers = Arrays.asList(1, 2, 3, 4, 5); + Integer sum = StreamSumCalculator.getSumUsingCollect(integers); + assertEquals(15, sum.intValue()); + } + + @Test + public void givenListOfIntegersWhenSummingUsingSumThenCorrectValueReturned() { + List integers = Arrays.asList(1, 2, 3, 4, 5); + Integer sum = StreamSumCalculator.getSumUsingSum(integers); + assertEquals(15, sum.intValue()); + } + + @Test + public void givenListOfItemsWhenSummingUsingCustomizedAccumulatorThenCorrectValueReturned() { + Item item1 = new Item(1, 10); + Item item2 = new Item(2, 15); + Item item3 = new Item(3, 25); + Item item4 = new Item(4, 40); + + List items = Arrays.asList(item1, item2, item3, item4); + + Integer sum = StreamSumCalculatorWithObject.getSumUsingCustomizedAccumulator(items); + assertEquals(90, sum.intValue()); + + } + + @Test + public void givenListOfItemsWhenSummingUsingJavaAccumulatorThenCorrectValueReturned() { + Item item1 = new Item(1, 10); + Item item2 = new Item(2, 15); + Item item3 = new Item(3, 25); + Item item4 = new Item(4, 40); + + List items = Arrays.asList(item1, item2, item3, item4); + + Integer sum = StreamSumCalculatorWithObject.getSumUsingJavaAccumulator(items); + assertEquals(90, sum.intValue()); + } + + @Test + public void givenListOfItemsWhenSummingUsingReduceThenCorrectValueReturned() { + Item item1 = new Item(1, 10); + Item item2 = new Item(2, 15); + Item item3 = new Item(3, 25); + Item item4 = new Item(4, 40); + + List items = Arrays.asList(item1, item2, item3, item4); + + Integer sum = StreamSumCalculatorWithObject.getSumUsingReduce(items); + assertEquals(90, sum.intValue()); + } + + @Test + public void givenListOfItemsWhenSummingUsingCollectThenCorrectValueReturned() { + Item item1 = new Item(1, 10); + Item item2 = new Item(2, 15); + Item item3 = new Item(3, 25); + Item item4 = new Item(4, 40); + + List items = Arrays.asList(item1, item2, item3, item4); + + Integer sum = StreamSumCalculatorWithObject.getSumUsingCollect(items); + assertEquals(90, sum.intValue()); + } + + @Test + public void givenListOfItemsWhenSummingUsingSumThenCorrectValueReturned() { + Item item1 = new Item(1, 10); + Item item2 = new Item(2, 15); + Item item3 = new Item(3, 25); + Item item4 = new Item(4, 40); + + List items = Arrays.asList(item1, item2, item3, item4); + + Integer sum = StreamSumCalculatorWithObject.getSumUsingSum(items); + assertEquals(90, sum.intValue()); + } + + @Test + public void givenMapWhenSummingThenCorrectValueReturned() { + Map map = new HashMap(); + map.put(1, 10); + map.put(2, 15); + map.put(3, 25); + map.put(4, 40); + + Integer sum = StreamSumCalculator.getSumOfMapValues(map); + assertEquals(90, sum.intValue()); + } + + @Test + public void givenStringWhenSummingThenCorrectValueReturned() { + String string = "Item1 10 Item2 25 Item3 30 Item4 45"; + + Integer sum = StreamSumCalculator.getSumIntegersFromString(string); + assertEquals(110, sum.intValue()); + } + +} diff --git a/java-streams/src/test/java/com/baeldung/streamordering/BenchmarkManualTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/streamordering/BenchmarkManualTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/streamordering/BenchmarkManualTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/streamordering/BenchmarkManualTest.java diff --git a/java-streams/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java b/core-java-modules/core-java-streams/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java similarity index 100% rename from java-streams/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java rename to core-java-modules/core-java-streams/src/test/java/com/baeldung/streamordering/StreamsOrderingUnitTest.java diff --git a/java-streams/src/test/resources/.gitignore b/core-java-modules/core-java-streams/src/test/resources/.gitignore similarity index 100% rename from java-streams/src/test/resources/.gitignore rename to core-java-modules/core-java-streams/src/test/resources/.gitignore diff --git a/core-java-modules/core-java/README.md b/core-java-modules/core-java/README.md index 41275f6367..54110d9362 100644 --- a/core-java-modules/core-java/README.md +++ b/core-java-modules/core-java/README.md @@ -7,7 +7,7 @@ - [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven) - [Introduction to Nashorn](http://www.baeldung.com/java-nashorn) - [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency) -- [How to Add a Single Element to a Stream](http://www.baeldung.com/java-stream-append-prepend) +- [JVM Log Forging](http://www.baeldung.com/jvm-log-forging) - [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null) - [How to Get a Name of a Method Being Executed?](http://www.baeldung.com/java-name-of-executing-method) - [Introduction to Java Serialization](http://www.baeldung.com/java-serialization) diff --git a/java-streams-2/README.md b/java-streams-2/README.md deleted file mode 100644 index 66fbe69ed4..0000000000 --- a/java-streams-2/README.md +++ /dev/null @@ -1,9 +0,0 @@ -## Java Streams Cookbooks and Examples - -This module contains articles about the Stream API in Java. - -### Relevant Articles: -- [Guide to Stream.reduce()](https://www.baeldung.com/java-stream-reduce) -- [How to Break from Java Stream forEach](https://www.baeldung.com/java-break-stream-foreach) -- [Java IntStream Conversions](https://www.baeldung.com/java-intstream-convert) -- More articles: [[<-- prev]](/java-streams) diff --git a/java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java b/java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java deleted file mode 100644 index a17c6a02b6..0000000000 --- a/java-streams-2/src/main/java/com/baeldung/reduce/entities/User.java +++ /dev/null @@ -1,25 +0,0 @@ -package com.baeldung.reduce.entities; - -public class User { - - private final String name; - private final int age; - - public User(String name, int age) { - this.name = name; - this.age = age; - } - - public String getName() { - return name; - } - - public int getAge() { - return age; - } - - @Override - public String toString() { - return "User{" + "name=" + name + ", age=" + age + '}'; - } -} diff --git a/java-streams/README.md b/java-streams/README.md deleted file mode 100644 index a57fdec7fa..0000000000 --- a/java-streams/README.md +++ /dev/null @@ -1,21 +0,0 @@ -## Java Streams Cookbooks and Examples - -This module contains articles about the Stream API in Java. - -### Relevant Articles: -- [The Java 8 Stream API Tutorial](https://www.baeldung.com/java-8-streams) -- [Introduction to Java 8 Streams](https://www.baeldung.com/java-8-streams-introduction) -- [Java 8 and Infinite Streams](https://www.baeldung.com/java-inifinite-streams) -- [Java 8 Stream findFirst() vs. findAny()](https://www.baeldung.com/java-stream-findfirst-vs-findany) -- [How to Get the Last Element of a Stream in Java?](https://www.baeldung.com/java-stream-last-element) -- [“Stream has already been operated upon or closed” Exception in Java](https://www.baeldung.com/java-stream-operated-upon-or-closed-exception) -- [Iterable to Stream in Java](https://www.baeldung.com/java-iterable-to-stream) -- [How to Iterate Over a Stream With Indices](https://www.baeldung.com/java-stream-indices) -- [Primitive Type Streams in Java 8](https://www.baeldung.com/java-8-primitive-streams) -- [Stream Ordering in Java](https://www.baeldung.com/java-stream-ordering) -- [Introduction to Protonpack](https://www.baeldung.com/java-protonpack) -- [Java Stream Filter with Lambda Expression](https://www.baeldung.com/java-stream-filter-lambda) -- [Counting Matches on a Stream Filter](https://www.baeldung.com/java-stream-filter-count) -- [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api) -- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams) -- More articles: [[next -->]](/java-streams-2) diff --git a/java-streams/pom.xml b/java-streams/pom.xml deleted file mode 100644 index bd0123e01d..0000000000 --- a/java-streams/pom.xml +++ /dev/null @@ -1,121 +0,0 @@ - - 4.0.0 - java-streams - 0.1.0-SNAPSHOT - java-streams - jar - - - com.baeldung - parent-java - 0.0.1-SNAPSHOT - ../parent-java - - - - - - org.openjdk.jmh - jmh-core - ${jmh-core.version} - - - org.openjdk.jmh - jmh-generator-annprocess - ${jmh-generator.version} - provided - - - org.apache.commons - commons-lang3 - ${commons-lang3.version} - - - log4j - log4j - ${log4j.version} - - - org.projectlombok - lombok - ${lombok.version} - provided - - - - org.assertj - assertj-core - ${assertj.version} - test - - - com.codepoetics - protonpack - ${protonpack.version} - - - io.vavr - vavr - ${vavr.version} - - - one.util - streamex - ${streamex.version} - - - org.aspectj - aspectjrt - ${asspectj.version} - - - org.aspectj - aspectjweaver - ${asspectj.version} - - - pl.touk - throwing-function - ${throwing-function.version} - - - - - java-streams - - - src/main/resources - true - - - - - - org.apache.maven.plugins - maven-compiler-plugin - ${maven-compiler-plugin.version} - - ${maven.compiler.source} - ${maven.compiler.target} - -parameters - - - - - - - - 0.9.0 - 1.15 - 0.6.5 - 2.10 - 1.3 - - 3.11.1 - 1.8.9 - 3.1 - 1.8 - 1.8 - - diff --git a/java-streams/src/main/java/com/baeldung/reduce/application/Application.java b/java-streams/src/main/java/com/baeldung/reduce/application/Application.java deleted file mode 100644 index b101c86780..0000000000 --- a/java-streams/src/main/java/com/baeldung/reduce/application/Application.java +++ /dev/null @@ -1,70 +0,0 @@ -package com.baeldung.reduce.application; - -import com.baeldung.reduce.entities.User; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.List; -import org.openjdk.jmh.annotations.Benchmark; -import org.openjdk.jmh.annotations.BenchmarkMode; -import org.openjdk.jmh.annotations.Fork; -import org.openjdk.jmh.annotations.Mode; -import org.openjdk.jmh.annotations.Warmup; - -public class Application { - - public static void main(String[] args) throws Exception { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result1 = numbers.stream().reduce(0, (subtotal, element) -> subtotal + element); - System.out.println(result1); - - int result2 = numbers.stream().reduce(0, Integer::sum); - System.out.println(result2); - - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result3 = letters.stream().reduce("", (partialString, element) -> partialString + element); - System.out.println(result3); - - String result4 = letters.stream().reduce("", String::concat); - System.out.println(result4); - - String result5 = letters.stream().reduce("", (partialString, element) -> partialString.toUpperCase() + element.toUpperCase()); - System.out.println(result5); - - List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); - int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - System.out.println(result6); - - String result7 = letters.parallelStream().reduce("", String::concat); - System.out.println(result7); - - int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - System.out.println(result8); - - org.openjdk.jmh.Main.main(args); - - } - - @Benchmark - @Fork(value = 1, warmups = 2) - @Warmup(iterations = 2) - @BenchmarkMode(Mode.AverageTime) - public void executeReduceOnParallelizedStream() { - List userList = new ArrayList<>(); - for (int i = 0; i <= 1000000; i++) { - userList.add(new User("John" + i, i)); - } - userList.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - } - - @Benchmark - @Fork(value = 1, warmups = 2) - @Warmup(iterations = 2) - @BenchmarkMode(Mode.AverageTime) - public void executeReduceOnSequentialStream() { - List userList = new ArrayList<>(); - for (int i = 0; i <= 1000000; i++) { - userList.add(new User("John" + i, i)); - } - userList.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - } -} diff --git a/java-streams/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java b/java-streams/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java deleted file mode 100644 index 8b4af2cbe2..0000000000 --- a/java-streams/src/main/java/com/baeldung/reduce/utilities/NumberUtils.java +++ /dev/null @@ -1,52 +0,0 @@ -package com.baeldung.reduce.utilities; - -import java.util.List; -import java.util.function.BiFunction; -import java.util.logging.Level; -import java.util.logging.Logger; - -public abstract class NumberUtils { - - private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName()); - - public static int divideListElements(List values, Integer divider) { - return values.stream() - .reduce(0, (a, b) -> { - try { - return a / divider + b / divider; - } catch (ArithmeticException e) { - LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); - } - return 0; - }); - } - - public static int divideListElementsWithExtractedTryCatchBlock(List values, int divider) { - return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider)); - } - - public static int divideListElementsWithApplyFunctionMethod(List values, int divider) { - BiFunction division = (a, b) -> a / b; - return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider)); - } - - private static int divide(int value, int factor) { - int result = 0; - try { - result = value / factor; - } catch (ArithmeticException e) { - LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero"); - } - return result; - } - - private static int applyFunction(BiFunction function, int a, int b) { - try { - return function.apply(a, b); - } - catch(Exception e) { - LOGGER.log(Level.INFO, "Exception occurred!"); - } - return 0; - } -} diff --git a/java-streams/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java b/java-streams/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java deleted file mode 100644 index 8e2ff7bf22..0000000000 --- a/java-streams/src/test/java/com/baeldung/reduce/tests/StreamReduceUnitTest.java +++ /dev/null @@ -1,79 +0,0 @@ -package com.baeldung.reduce.tests; - -import com.baeldung.reduce.entities.User; -import com.baeldung.reduce.utilities.NumberUtils; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.List; -import static org.assertj.core.api.Assertions.assertThat; -import org.junit.Test; - -public class StreamReduceUnitTest { - - @Test - public void givenIntegerList_whenReduceWithSumAccumulatorLambda_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result = numbers.stream().reduce(0, (a, b) -> a + b); - assertThat(result).isEqualTo(21); - } - - @Test - public void givenIntegerList_whenReduceWithSumAccumulatorMethodReference_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - int result = numbers.stream().reduce(0, Integer::sum); - assertThat(result).isEqualTo(21); - } - - @Test - public void givenStringList_whenReduceWithConcatenatorAccumulatorLambda_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", (a, b) -> a + b); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenStringList_whenReduceWithConcatenatorAccumulatorMethodReference_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", String::concat); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenStringList_whenReduceWithUppercaseConcatenatorAccumulator_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.stream().reduce("", (a, b) -> a.toUpperCase() + b.toUpperCase()); - assertThat(result).isEqualTo("ABCDE"); - } - - @Test - public void givenUserList_whenReduceWithAgeAccumulatorAndSumCombiner_thenCorrect() { - List users = Arrays.asList(new User("John", 30), new User("Julie", 35)); - int result = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum); - assertThat(result).isEqualTo(65); - } - - @Test - public void givenStringList_whenReduceWithParallelStream_thenCorrect() { - List letters = Arrays.asList("a", "b", "c", "d", "e"); - String result = letters.parallelStream().reduce("", String::concat); - assertThat(result).isEqualTo("abcde"); - } - - @Test - public void givenNumberUtilsClass_whenCalledDivideListElements_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElements(numbers, 1)).isEqualTo(21); - } - - @Test - public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlock_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21); - } - - @Test - public void givenStream_whneCalleddivideListElementsWithApplyFunctionMethod_thenCorrect() { - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6); - assertThat(NumberUtils.divideListElementsWithApplyFunctionMethod(numbers, 1)).isEqualTo(21); - } -} diff --git a/pom.xml b/pom.xml index f9e45f5c93..8ec64309ee 100644 --- a/pom.xml +++ b/pom.xml @@ -381,7 +381,7 @@ cloud-foundry-uaa/cf-uaa-oauth2-client cloud-foundry-uaa/cf-uaa-oauth2-resource-server code-generation - core-groovy + core-groovy core-groovy-2 core-groovy-collections @@ -391,6 +391,9 @@ core-java-modules/core-java-8-2 core-java-modules/core-java-annotations core-java-modules/core-java-streams + core-java-modules/core-java-streams-2 + core-java-modules/core-java-streams-3 + core-java-modules/core-java-function core-java-modules/core-java-lang-math @@ -500,8 +503,6 @@ java-numbers-2 java-rmi java-spi - java-streams - java-strings java-strings-2 java-strings-3 @@ -1152,7 +1153,7 @@ cloud-foundry-uaa/cf-uaa-oauth2-client cloud-foundry-uaa/cf-uaa-oauth2-resource-server code-generation - core-groovy + core-groovy core-groovy-2 core-groovy-collections @@ -1161,6 +1162,9 @@ core-java-modules/core-java-8-2 core-java-modules/core-java-annotations core-java-modules/core-java-streams + core-java-modules/core-java-streams-2 + core-java-modules/core-java-streams-3 + core-java-modules/core-java-function core-java-modules/core-java-lang-math @@ -1204,9 +1208,9 @@ core-java-modules/core-java-perf core-java-modules/core-java-sun core-java-modules/core-java-string-conversions - core-java-modules/core-java-string-conversions-2 - core-java-modules/core-java-string-apis - core-scala + core-java-modules/core-java-string-conversions-2 + core-java-modules/core-java-string-apis + core-scala couchbase custom-pmd @@ -1266,8 +1270,6 @@ java-numbers-2 java-rmi java-spi - java-streams - java-strings java-strings-2 java-strings-3