diff --git a/core-java-8/pom.xml b/core-java-8/pom.xml index f5506f095e..17d330b3b8 100644 --- a/core-java-8/pom.xml +++ b/core-java-8/pom.xml @@ -1,258 +1,276 @@ - - 4.0.0 - com.baeldung - core-java-8 - 0.1.0-SNAPSHOT - jar - - core-java-8 - - - - com.baeldung - parent-modules - 1.0.0-SNAPSHOT - - - - - - - com.google.guava - guava - ${guava.version} - - - - org.apache.commons - commons-collections4 - ${commons-collections4.version} - - - - commons-io - commons-io - ${commons-io.version} - - - - org.apache.commons - commons-lang3 - ${commons-lang3.version} - - - - org.apache.commons - commons-math3 - ${commons-math3.version} - - - - log4j - log4j - 1.2.17 - - - - commons-codec - commons-codec - ${commons-codec.version} - - - - org.projectlombok - lombok - ${lombok.version} - provided - - - - - - org.assertj - assertj-core - ${assertj.version} - test - - - - com.jayway.awaitility - awaitility - ${avaitility.version} - test - - - - - - core-java-8 - - - src/main/resources - true - - - - - - org.apache.maven.plugins - maven-dependency-plugin - - - copy-dependencies - prepare-package - - copy-dependencies - - - ${project.build.directory}/libs - - - - - - - org.apache.maven.plugins - maven-jar-plugin - - - - true - libs/ - org.baeldung.executable.ExecutableMavenJar - - - - - - org.apache.maven.plugins - maven-assembly-plugin - - - package - - single - - - ${project.basedir} - - - org.baeldung.executable.ExecutableMavenJar - - - - jar-with-dependencies - - - - - - - org.apache.maven.plugins - maven-shade-plugin - - - - shade - - - true - - - org.baeldung.executable.ExecutableMavenJar - - - - - - - - com.jolira - onejar-maven-plugin - - - - org.baeldung.executable.ExecutableMavenJar - true - ${project.build.finalName}-onejar.${project.packaging} - - - one-jar - - - - - - org.springframework.boot - spring-boot-maven-plugin - - - - repackage - - - spring-boot - org.baeldung.executable.ExecutableMavenJar - - - - - - - - - - - integration - - - - org.apache.maven.plugins - maven-surefire-plugin - - - integration-test - - test - - - - **/*ManualTest.java - - - **/*IntegrationTest.java - - - - - - - json - - - - - - - - - - - - 21.0 - 3.5 - 3.6.1 - 2.5 - 4.1 - 4.01 - 1.10 - 1.16.12 - - - 3.6.1 - 1.7.0 - - + + 4.0.0 + com.baeldung + core-java-8 + 0.1.0-SNAPSHOT + jar + + core-java-8 + + + + com.baeldung + parent-modules + 1.0.0-SNAPSHOT + + + + + + + com.google.guava + guava + ${guava.version} + + + + org.apache.commons + commons-collections4 + ${commons-collections4.version} + + + + commons-io + commons-io + ${commons-io.version} + + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + + org.apache.commons + commons-math3 + ${commons-math3.version} + + + + log4j + log4j + 1.2.17 + + + + commons-codec + commons-codec + ${commons-codec.version} + + + + org.projectlombok + lombok + ${lombok.version} + provided + + + + + + org.assertj + assertj-core + ${assertj.version} + test + + + + com.jayway.awaitility + awaitility + ${avaitility.version} + test + + + + org.openjdk.jmh + jmh-core + 1.19 + + + + org.openjdk.jmh + jmh-generator-annprocess + 1.19 + + + + org.openjdk.jmh + jmh-generator-bytecode + 1.19 + + + + + + core-java-8 + + + src/main/resources + true + + + + + + org.apache.maven.plugins + maven-dependency-plugin + + + copy-dependencies + prepare-package + + copy-dependencies + + + ${project.build.directory}/libs + + + + + + + org.apache.maven.plugins + maven-jar-plugin + + + + true + libs/ + org.baeldung.executable.ExecutableMavenJar + + + + + + org.apache.maven.plugins + maven-assembly-plugin + + + package + + single + + + ${project.basedir} + + + org.baeldung.executable.ExecutableMavenJar + + + + jar-with-dependencies + + + + + + + org.apache.maven.plugins + maven-shade-plugin + + + + shade + + + true + + + org.baeldung.executable.ExecutableMavenJar + + + + + + + + com.jolira + onejar-maven-plugin + + + + org.baeldung.executable.ExecutableMavenJar + true + ${project.build.finalName}-onejar.${project.packaging} + + + one-jar + + + + + + org.springframework.boot + spring-boot-maven-plugin + + + + repackage + + + spring-boot + org.baeldung.executable.ExecutableMavenJar + + + + + + + + + + + integration + + + + org.apache.maven.plugins + maven-surefire-plugin + + + integration-test + + test + + + + **/*ManualTest.java + + + **/*IntegrationTest.java + + + + + + + json + + + + + + + + + + + + 21.0 + 3.5 + 3.6.1 + 2.5 + 4.1 + 4.01 + 1.10 + 1.16.12 + + + 3.6.1 + 1.7.0 + + \ No newline at end of file diff --git a/core-java-8/src/test/java/com/baeldung/counter/CounterStatistics.java b/core-java-8/src/test/java/com/baeldung/counter/CounterStatistics.java new file mode 100644 index 0000000000..2a42a166fa --- /dev/null +++ b/core-java-8/src/test/java/com/baeldung/counter/CounterStatistics.java @@ -0,0 +1,45 @@ +package com.baeldung.counter; + +import java.util.HashMap; +import java.util.Map; + +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 com.baeldung.counter.CounterUtil.MutableInteger; + +@Fork(value = 1, warmups = 3) +@BenchmarkMode(Mode.All) +public class CounterStatistics { + + private static final Map counterMap = new HashMap<>(); + private static final Map counterWithMutableIntMap = new HashMap<>(); + private static final Map counterWithIntArrayMap = new HashMap<>(); + private static final Map counterWithLongWrapperMap = new HashMap<>(); + + @Benchmark + public void wrapperAsCounter() { + CounterUtil.counterWithWrapperObject(counterMap); + } + + @Benchmark + public void lambdaExpressionWithWrapper() { + CounterUtil.counterWithLambdaAndWrapper(counterWithLongWrapperMap); + } + + @Benchmark + public void mutableIntegerAsCounter() { + CounterUtil.counterWithMutableInteger(counterWithMutableIntMap); + } + + @Benchmark + public void primitiveArrayAsCounter() { + CounterUtil.counterWithPrimitiveArray(counterWithIntArrayMap); + } + + public static void main(String[] args) throws Exception { + org.openjdk.jmh.Main.main(args); + } +} diff --git a/core-java-8/src/test/java/com/baeldung/counter/CounterTest.java b/core-java-8/src/test/java/com/baeldung/counter/CounterTest.java new file mode 100644 index 0000000000..657b510452 --- /dev/null +++ b/core-java-8/src/test/java/com/baeldung/counter/CounterTest.java @@ -0,0 +1,53 @@ +package com.baeldung.counter; + +import java.util.HashMap; +import java.util.Map; + +import static org.junit.Assert.*; + +import org.junit.Test; + +import com.baeldung.counter.CounterUtil.MutableInteger; + +public class CounterTest { + + @Test + public void whenMapWithWrapperAsCounter_runsSuccessfully() { + Map counterMap = new HashMap<>(); + CounterUtil.counterWithWrapperObject(counterMap); + + assertEquals(3, counterMap.get("China") + .intValue()); + assertEquals(2, counterMap.get("India") + .intValue()); + } + + @Test + public void whenMapWithLambdaAndWrapperCounter_runsSuccessfully() { + Map counterMap = new HashMap<>(); + CounterUtil.counterWithLambdaAndWrapper(counterMap); + + assertEquals(3l, counterMap.get("China") + .longValue()); + assertEquals(2l, counterMap.get("India") + .longValue()); + } + + @Test + public void whenMapWithMutableIntegerCounter_runsSuccessfully() { + Map counterMap = new HashMap<>(); + CounterUtil.counterWithMutableInteger(counterMap); + assertEquals(3, counterMap.get("China") + .getCount()); + assertEquals(2, counterMap.get("India") + .getCount()); + } + + @Test + public void whenMapWithPrimitiveArray_runsSuccessfully() { + Map counterMap = new HashMap<>(); + CounterUtil.counterWithPrimitiveArray(counterMap); + assertEquals(3, counterMap.get("China")[0]); + assertEquals(2, counterMap.get("India")[0]); + } +} diff --git a/core-java-8/src/test/java/com/baeldung/counter/CounterUtil.java b/core-java-8/src/test/java/com/baeldung/counter/CounterUtil.java new file mode 100644 index 0000000000..647fbfb0cc --- /dev/null +++ b/core-java-8/src/test/java/com/baeldung/counter/CounterUtil.java @@ -0,0 +1,61 @@ +package com.baeldung.counter; + +import java.util.Map; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class CounterUtil { + + private final static String[] COUNTRY_NAMES = { "China", "Australia", "India", "USA", "USSR", "UK", "China", "France", "Poland", "Austria", "India", "USA", "Egypt", "China" }; + + public static void counterWithWrapperObject(Map counterMap) { + for (String country : COUNTRY_NAMES) { + counterMap.compute(country, (k, v) -> v == null ? 1 : v + 1); + } + } + + public static void counterWithLambdaAndWrapper(Map counterMap) { + counterMap.putAll(Stream.of(COUNTRY_NAMES) + .parallel() + .collect(Collectors.groupingBy(k -> k, Collectors.counting()))); + } + + public static class MutableInteger { + int count; + + public MutableInteger(int count) { + this.count = count; + } + + public void increment() { + this.count++; + } + + public int getCount() { + return this.count; + } + } + + public static void counterWithMutableInteger(Map counterMap) { + for (String country : COUNTRY_NAMES) { + MutableInteger oldValue = counterMap.get(country); + if (oldValue != null) { + oldValue.increment(); + } else { + counterMap.put(country, new MutableInteger(1)); + } + } + } + + public static void counterWithPrimitiveArray(Map counterMap) { + for (String country : COUNTRY_NAMES) { + int[] oldCounter = counterMap.get(country); + if (oldCounter != null) { + oldCounter[0] += 1; + } else { + counterMap.put(country, new int[] { 1 }); + } + } + } + +}