Merge pull request #15815 from sk1418/mv-0-to-end-array

[mv-0-to-end-array] move zeros to the end

core-java-modules/core-java-arrays-operations-advanced-2/src/test/java/com/baeldung/movezerototheend/MoveZeroesToTheEndOfAnArrayUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.movezerototheend;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+public class MoveZeroesToTheEndOfAnArrayUnitTest {
+    private static final int[] EXPECTED = new int[] { 42, 2, 3, 4, 0, 0 };
+
+    @Test
+    void whenCreatingANewArrayAndCopyingValues_thenGetTheExpectedResult() {
+        int[] array = new int[] { 42, 2, 0, 3, 4, 0 };
+        int[] result = new int[array.length];
+        int idx = 0;
+        for (int n : array) {
+            if (n != 0) {
+                result[idx++] = n;
+            }
+        }
+        assertArrayEquals(EXPECTED, result);
+    }
+
+    @Test
+    void whenMovingZeroInTheOriginalArray_thenGetTheExpectedResult() {
+        int[] array = new int[] { 42, 2, 0, 3, 4, 0 };
+        int idx = 0;
+        for (int n : array) {
+            if (n != 0) {
+                array[idx++] = n;
+            }
+        }
+        while (idx < array.length) {
+            array[idx++] = 0;
+        }
+        assertArrayEquals(EXPECTED, array);
+    }
+}