JAVA-8354: Split or move core-java-collections-3

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

@@ -12,4 +12,5 @@ This module contains articles about Java collections
 - [Defining a Char Stack in Java](https://www.baeldung.com/java-char-stack)
 - [Guide to the Java Queue Interface](https://www.baeldung.com/java-queue)
 - [An Introduction to Synchronized Java Collections](https://www.baeldung.com/java-synchronized-collections)
-- [[More -->]](/core-java-modules/core-java-collections-2)
+- [Convert an Array of Primitives to a List](https://www.baeldung.com/java-primitive-array-to-list)
+- More articles: [[next -->]](/core-java-modules/core-java-collections-2)

core-java-modules/core-java-collections/pom.xml

@@ -25,6 +25,11 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
     </dependencies>
 
 </project>

core-java-modules/core-java-collections/src/main/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToList.java

@@ -0,0 +1,49 @@
+package com.baeldung.collections.convertarrayprimitives;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+import com.google.common.primitives.Ints;
+
+public class ConvertPrimitivesArrayToList {
+
+    public static void failConvert() {
+        int[] input = new int[]{1,2,3,4};
+        // List<Integer> inputAsList = Arrays.asList(input);
+    }
+
+    public static List<Integer> iterateConvert(int[] input) {
+        List<Integer> output = new ArrayList<Integer>();
+        for (int value : input) {
+            output.add(value);
+        }
+        return output;
+    }
+
+    public static List<Integer> streamConvert(int[] input) {
+        List<Integer> output = Arrays.stream(input).boxed().collect(Collectors.toList());
+        return output;
+    }
+
+    public static List<Integer> streamConvertIntStream(int[] input) {
+        List<Integer> output = IntStream.of(input).boxed().collect(Collectors.toList());
+        return output;
+    }
+
+    public static List<Integer> guavaConvert(int[] input) {
+        List<Integer> output = Ints.asList(input);
+        return output;
+    }
+
+    public static List<Integer> apacheCommonConvert(int[] input) {
+        Integer[] outputBoxed = ArrayUtils.toObject(input);
+        List<Integer> output = Arrays.asList(outputBoxed);
+        return output;
+    }
+
+}

core-java-modules/core-java-collections/src/test/java/com/baeldung/collections/convertarrayprimitives/ConvertPrimitivesArrayToListUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.collections.convertarrayprimitives;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+
+public class ConvertPrimitivesArrayToListUnitTest {
+
+    @Test
+    public void givenArrayWithPrimitives_whenIterativeConvert_thenArrayGetsConverted() {
+        assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.iterateConvert(new int[]{1,2,3,4}));
+    }
+
+    @Test
+    public void givenArrayWithPrimitives_whenStreamConvert_thenArrayGetsConverted() {
+        assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.streamConvert(new int[]{1,2,3,4}));
+    }
+
+    @Test
+    public void givenArrayWithPrimitives_whenIntStreamConvert_thenArrayGetsConverted() {
+        assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.streamConvertIntStream(new int[]{1,2,3,4}));
+    }
+
+    @Test
+    public void givenArrayWithPrimitives_whenGuavaConvert_thenArrayGetsConverted() {
+        assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.guavaConvert(new int[]{1,2,3,4}));
+    }
+
+    @Test
+    public void givenArrayWithPrimitives_whenApacheCommonConvert_thenArrayGetsConverted() {
+        assertEquals(Arrays.asList(1,2,3,4), ConvertPrimitivesArrayToList.apacheCommonConvert(new int[]{1,2,3,4}));
+    }
+}