[JAVA-616] core-java-arrays-operations-basic

* Creation

* Moved code from https://www.baeldung.com/java-initialize-array

* Moved code from https://www.baeldung.com/java-common-array-operations

* Moved code from
https://www.baeldung.com/java-add-element-to-array-vs-list

* Moved code from https://www.baeldung.com/java-array-contains-value

* Moved code from https://www.baeldung.com/java-array-remove-element

* Moved code from https://www.baeldung.com/java-array-remove-first-element

* Moved code from https://www.baeldung.com/java-array-add-element-at-the-end

core-java-modules/core-java-arrays-2/README.md

@@ -4,10 +4,5 @@ This module contains articles about Java arrays
 
 ## Relevant Articles
 
-- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
-- [Array Operations in Java](https://www.baeldung.com/java-common-array-operations)
 - [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
-- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
-- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
-- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
 - [[<-- Prev]](/core-java-modules/core-java-arrays)

core-java-modules/core-java-arrays-2/src/main/java/com/baeldung/array/operations/ArraysIntersectionOperations.java

@@ -0,0 +1,27 @@
+package com.baeldung.array.operations;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.stream.Stream;
+
+public class ArraysIntersectionOperations {
+
+    public static Integer[] intersectionSimple(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(Arrays.asList(b)::contains)
+            .toArray(Integer[]::new);
+    }
+
+    public static Integer[] intersectionSet(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(Arrays.asList(b)::contains)
+            .distinct()
+            .toArray(Integer[]::new);
+    }
+
+    public static Integer[] intersectionMultiSet(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(new LinkedList<>(Arrays.asList(b))::remove)
+            .toArray(Integer[]::new);
+    }
+}

core-java-modules/core-java-arrays-2/src/test/java/com/baeldung/array/operations/IntersectionUnitTest.java

@@ -2,7 +2,7 @@ package com.baeldung.array.operations;
 
 import org.junit.jupiter.api.Test;
 
-import static com.baeldung.array.operations.ArrayOperations.*;
+import static com.baeldung.array.operations.ArraysIntersectionOperations.*;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class IntersectionUnitTest {

core-java-modules/core-java-arrays-operations-basic/README.md

@@ -0,0 +1,19 @@
+## Core Java Arrays - Basic Operations
+
+This module contains articles about basic operations on arrays in Java
+
+Basic operations would cover anything elementary we should expect to be able to achieve on a collection type:
+
+- Adding/Removing elements
+- Getting elements
+- Iterating
+
+### Relevant Articles: 
+- [Initializing Arrays in Java](https://www.baeldung.com/java-initialize-array)
+- [Array Operations in Java](https://www.baeldung.com/java-common-array-operations)
+- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
+- [Check if a Java Array Contains a Value](https://www.baeldung.com/java-array-contains-value)
+- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
+- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
+- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
+- [[More advanced operations -->]](/core-java-modules/core-java-arrays-operations-advanced)

core-java-modules/core-java-arrays-operations-basic/pom.xml

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-operations-basic</artifactId>
+    <name>core-java-arrays-operations-basic</name>
+    <packaging>jar</packaging>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>${shade.plugin.version}</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <finalName>benchmarks</finalName>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>org.openjdk.jmh.Main</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+
+        <!-- Benchmarking -->
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <shade.plugin.version>3.2.0</shade.plugin.version>
+
+        <commons-lang3.version>3.9</commons-lang3.version>
+
+        <jmh.version>1.19</jmh.version>
+
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-operations-basic/src/main/java/com/baeldung/array/ArrayBenchmarkRunner.java

@@ -9,7 +9,7 @@ public class ArrayBenchmarkRunner {
   public static void main(String[] args) throws Exception {
 
     Options options = new OptionsBuilder()
-        .include(SearchArrayUnitTest.class.getSimpleName()).threads(1)
+        .include(SearchArrayBenchmark.class.getSimpleName()).threads(1)
         .forks(1).shouldFailOnError(true).shouldDoGC(true)
         .jvmArgs("-server").build();
 

core-java-modules/core-java-arrays-operations-basic/src/main/java/com/baeldung/array/SearchArrayBenchmark.java

@@ -8,7 +8,7 @@ import java.util.concurrent.TimeUnit;
 @BenchmarkMode(Mode.AverageTime)
 @Warmup(iterations = 5)
 @OutputTimeUnit(TimeUnit.MICROSECONDS)
-public class SearchArrayUnitTest {
+public class SearchArrayBenchmark {
 
     @State(Scope.Benchmark)
     public static class SearchData {

core-java-modules/core-java-arrays/README.md

@@ -4,7 +4,5 @@ This module contains articles about Java arrays
 
 ### Relevant Articles: 
 - [How to Copy an Array in Java](https://www.baeldung.com/java-array-copy)
-- [Check if a Java Array Contains a Value](https://www.baeldung.com/java-array-contains-value)
-- [Initializing Arrays in Java](https://www.baeldung.com/java-initialize-array)
 - [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
 - [[More -->]](/core-java-modules/core-java-arrays-2)

core-java-modules/pom.xml

@@ -126,6 +126,7 @@
         <module>core-java-arrays-guides</module>
         <module>core-java-arrays-multidimensional</module>
         <module>core-java-arrays-convert</module>
+        <module>core-java-arrays-operations-basic</module>
     </modules>
 
 </project>