From 1d0afe4f07c1e823166102379b0ff4cf3c2f0227 Mon Sep 17 00:00:00 2001
From: Kai Yuan <kent.yuan@Gmail.com>
Date: Wed, 16 Aug 2023 02:40:47 +0200
Subject: [PATCH] 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-arrays-convert/pom.xml          |  1 -
 .../pom.xml                                   |  3 +-
 .../ArrayListToArrayUnitTest.java             | 46 +++++++++++++++++++
 3 files changed, 47 insertions(+), 3 deletions(-)
 create mode 100644 core-java-modules/core-java-collections-conversions-2/src/test/java/com/baeldung/arrayconversion/ArrayListToArrayUnitTest.java

diff --git a/core-java-modules/core-java-arrays-convert/pom.xml b/core-java-modules/core-java-arrays-convert/pom.xml
index c90b60e09a..480e1b3f07 100644
--- a/core-java-modules/core-java-arrays-convert/pom.xml
+++ b/core-java-modules/core-java-arrays-convert/pom.xml
@@ -20,5 +20,4 @@
             <version>${commons-lang3.version}</version>
         </dependency>
     </dependencies>
-
 </project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-collections-conversions-2/pom.xml b/core-java-modules/core-java-collections-conversions-2/pom.xml
index 0a30cbeae6..7b7533fc39 100644
--- a/core-java-modules/core-java-collections-conversions-2/pom.xml
+++ b/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>
\ No newline at end of file
diff --git a/core-java-modules/core-java-collections-conversions-2/src/test/java/com/baeldung/arrayconversion/ArrayListToArrayUnitTest.java b/core-java-modules/core-java-collections-conversions-2/src/test/java/com/baeldung/arrayconversion/ArrayListToArrayUnitTest.java
new file mode 100644
index 0000000000..63cdf22f3a
--- /dev/null
+++ b/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);
+    }
+}
\ No newline at end of file