From d14411e2b471f2d6987bfd040be730a222d0659a Mon Sep 17 00:00:00 2001
From: Ahmed Tawila <atawila@yahoo.com>
Date: Mon, 23 Oct 2017 10:58:07 +0200
Subject: [PATCH] BAEL-1250 Initializing Arrays in Java

---
 .../com/baeldung/array/ArrayInitializer.java  | 26 +++++++++++++++++++
 .../baeldung/array/ArrayInitializerTest.java  | 22 +++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/core-java/src/main/java/com/baeldung/array/ArrayInitializer.java b/core-java/src/main/java/com/baeldung/array/ArrayInitializer.java
index 0c9bf1834e..fd00c74e7f 100644
--- a/core-java/src/main/java/com/baeldung/array/ArrayInitializer.java
+++ b/core-java/src/main/java/com/baeldung/array/ArrayInitializer.java
@@ -45,4 +45,30 @@ public class ArrayInitializer {
         Arrays.fill(array, 0, 3, -50);
         return array;
     }
+
+    public static int[] initializeArrayUsingArraysCopy() {
+        int array[] = { 1, 2, 3, 4, 5 };
+        int[] copy = Arrays.copyOf(array, 5);
+        return copy;
+    }
+
+    public static int[] initializeLargerArrayUsingArraysCopy() {
+        int array[] = { 1, 2, 3, 4, 5 };
+        int[] copy = Arrays.copyOf(array, 6);
+        return copy;
+    }
+
+    public static int[] initializeArrayUsingArraysSetAll() {
+        int[] array = new int[20];
+
+        for (int i = 0; i < 20; i++) {
+            Arrays.setAll(array, p -> {
+                if (p > 9)
+                    return 0;
+                else
+                    return p;
+            });
+        }
+        return array;
+    }
 }
diff --git a/core-java/src/test/java/com/baeldung/array/ArrayInitializerTest.java b/core-java/src/test/java/com/baeldung/array/ArrayInitializerTest.java
index 0797a524c4..d3afad7b00 100644
--- a/core-java/src/test/java/com/baeldung/array/ArrayInitializerTest.java
+++ b/core-java/src/test/java/com/baeldung/array/ArrayInitializerTest.java
@@ -5,7 +5,10 @@ import static com.baeldung.array.ArrayInitializer.initializeArrayAtTimeOfDeclara
 import static com.baeldung.array.ArrayInitializer.initializeArrayAtTimeOfDeclarationMethod3;
 import static com.baeldung.array.ArrayInitializer.initializeArrayInLoop;
 import static com.baeldung.array.ArrayInitializer.initializeArrayRangeUsingArraysFill;
+import static com.baeldung.array.ArrayInitializer.initializeArrayUsingArraysCopy;
 import static com.baeldung.array.ArrayInitializer.initializeArrayUsingArraysFill;
+import static com.baeldung.array.ArrayInitializer.initializeArrayUsingArraysSetAll;
+import static com.baeldung.array.ArrayInitializer.initializeLargerArrayUsingArraysCopy;
 import static com.baeldung.array.ArrayInitializer.initializeMultiDimensionalArrayInLoop;
 import static org.junit.Assert.assertArrayEquals;
 
@@ -38,11 +41,28 @@ public class ArrayInitializerTest {
         assertArrayEquals(new int[] { 1, 2, 3, 4, 5 }, initializeArrayAtTimeOfDeclarationMethod3());
     }
 
+    @Test
     public void whenInitializeArrayUsingArraysFill_thenCorrect() {
         assertArrayEquals(new long[] { 30, 30, 30, 30, 30 }, initializeArrayUsingArraysFill());
     }
 
-    public void whenInitializeArrayRangeUsingArraysFill() {
+    @Test
+    public void whenInitializeArrayRangeUsingArraysFill_thenCorrect() {
         assertArrayEquals(new int[] { -50, -50, -50, 0, 0 }, initializeArrayRangeUsingArraysFill());
     }
+
+    @Test
+    public void whenInitializeArrayRangeUsingArraysCopy_thenCorrect() {
+        assertArrayEquals(new int[] { 1, 2, 3, 4, 5 }, initializeArrayUsingArraysCopy());
+    }
+
+    @Test
+    public void whenInitializeLargerArrayRangeUsingArraysCopy_thenCorrect() {
+        assertArrayEquals(new int[] { 1, 2, 3, 4, 5, 0 }, initializeLargerArrayUsingArraysCopy());
+    }
+
+    @Test
+    public void whenInitializeLargerArrayRangeUsingArraysSetAll_thenCorrect() {
+        assertArrayEquals(new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, initializeArrayUsingArraysSetAll());
+    }
 }