simple java conversion logic

core-java/src/test/java/org/baeldung/java/collections/CoreJavaCollectionsUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java;
+package org.baeldung.java.collections;
 
 import java.util.ArrayList;
 import java.util.Arrays;

core-java/src/test/java/org/baeldung/java/collections/JavaCollectionConversionUnitTest.java

@@ -0,0 +1,47 @@
+package org.baeldung.java.collections;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+import com.google.common.primitives.Ints;
+
+@SuppressWarnings("unused")
+public class JavaCollectionConversionUnitTest {
+
+    @Test
+    public final void givenUsingCoreJava_whenArrayConvertedToList_thenCorrect() {
+        final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
+        final List<Integer> targetList = Arrays.asList(sourceArray);
+    }
+
+    @Test
+    public void givenUsingCoreJava_whenListConvertedToArray_thenCorrect() {
+        final List<Integer> sourceList = Lists.<Integer> newArrayList(0, 1, 2, 3, 4, 5);
+        final Integer[] targetArray = sourceList.toArray(new Integer[sourceList.size()]);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenArrayConvertedToList_thenCorrect() {
+        final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
+        final List<Integer> targetList = Lists.newArrayList(sourceArray);
+    }
+
+    @Test
+    public void givenUsingGuava_whenLIistConvertedToArray_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final int[] targetArray = Ints.toArray(sourceList);
+    }
+
+    @Test
+    public void givenUsingCommonsCollections_whenArrayConvertedToList_thenCorrect() {
+        final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
+        final List<Integer> targetList = new ArrayList<>(6);
+        CollectionUtils.addAll(targetList, sourceArray);
+    }
+
+}