Convert an ArrayList of String to a String Array in Java (#14583)

* Convert an ArrayList of String to a String Array in Java

* fixing typo

* module moving

core-java-modules/core-java-arrays-convert/pom.xml

@@ -20,5 +20,4 @@
             <version>${commons-lang3.version}</version>
         </dependency>
     </dependencies>
-
 </project>

core-java-modules/core-java-collections-conversions-2/pom.xml

@@ -44,7 +44,6 @@
     <properties>
         <vavr.version>0.10.3</vavr.version>
         <java.version>11</java.version>
-	<modelmapper.version>3.1.1</modelmapper.version>
+        <modelmapper.version>3.1.1</modelmapper.version>
     </properties>
-
 </project>

core-java-modules/core-java-collections-conversions-2/src/test/java/com/baeldung/arrayconversion/ArrayListToArrayUnitTest.java

@@ -0,0 +1,46 @@
+package com.baeldung.arrayconversion;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.Lists;
+
+public class ArrayListToArrayUnitTest {
+    private static final List<String> INPUT_LIST = Lists.newArrayList("Michael Bolton", "Michael Jackson", "Guns and Roses", "Bryan Adams", "Air Supply");
+    private static final String[] EXPECTED_ARRAY = new String[] { "Michael Bolton", "Michael Jackson", "Guns and Roses", "Bryan Adams", "Air Supply" };
+
+    @Test
+    void whenUsingForLoop_thenGetExpectedResult() {
+        String[] result = new String[INPUT_LIST.size()];
+        for (int i = 0; i < INPUT_LIST.size(); i++) {
+            result[i] = INPUT_LIST.get(i);
+        }
+        assertArrayEquals(EXPECTED_ARRAY, result);
+    }
+
+    @Test
+    void whenUsingListToArray_thenGetExpectedResult() {
+        String[] result = new String[INPUT_LIST.size()];
+        INPUT_LIST.toArray(result);
+        assertArrayEquals(EXPECTED_ARRAY, result);
+
+        String[] result2 = INPUT_LIST.toArray(new String[0]);
+        assertArrayEquals(EXPECTED_ARRAY, result2);
+    }
+
+    @Test
+    void whenUsingStreamApi_thenGetExpectedResult() {
+        String[] result = INPUT_LIST.stream()
+          .toArray(String[]::new);
+        assertArrayEquals(EXPECTED_ARRAY, result);
+    }
+
+    @Test
+    void whenUsingListToArrayInJava11_thenGetExpectedResult() {
+        String[] result = INPUT_LIST.toArray(String[]::new);
+        assertArrayEquals(EXPECTED_ARRAY, result);
+    }
+}