From 29bfac0e957bdbb6a6d0a4549107376b1a33659e Mon Sep 17 00:00:00 2001
From: Shouvik Bhattacharya
 <33756821+shouvikbhattacharya@users.noreply.github.com>
Date: Mon, 27 Nov 2017 03:36:18 +0530
Subject: [PATCH] BAEL-1305: A Simple Guide to Java Loops. (#3133)

---
 .../java/com/baeldung/loops/LoopsInJava.java  | 43 +++++++++++++++++++
 .../com/baeldung/loops/WhenUsingLoops.java    | 37 ++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 core-java/src/main/java/com/baeldung/loops/LoopsInJava.java
 create mode 100644 core-java/src/test/java/com/baeldung/loops/WhenUsingLoops.java

diff --git a/core-java/src/main/java/com/baeldung/loops/LoopsInJava.java b/core-java/src/main/java/com/baeldung/loops/LoopsInJava.java
new file mode 100644
index 0000000000..1b2e621b52
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/loops/LoopsInJava.java
@@ -0,0 +1,43 @@
+package com.baeldung.loops;
+
+public class LoopsInJava {
+
+    public int[] simple_for_loop() {
+        int[] arr = new int[5];
+        for (int i = 0; i < 5; i++) {
+            arr[i] = i;
+            System.out.println("Simple for loop: i - " + i);
+        }
+        return arr;
+    }
+
+    public int[] enhanced_for_each_loop() {
+        int[] intArr = { 0, 1, 2, 3, 4 };
+        int[] arr = new int[5];
+        for (int num : intArr) {
+            arr[num] = num;
+            System.out.println("Enhanced for-each loop: i - " + num);
+        }
+        return arr;
+    }
+
+    public int[] while_loop() {
+        int i = 0;
+        int[] arr = new int[5];
+        while (i < 5) {
+            arr[i] = i;
+            System.out.println("While loop: i - " + i++);
+        }
+        return arr;
+    }
+
+    public int[] do_while_loop() {
+        int i = 0;
+        int[] arr = new int[5];
+        do {
+            arr[i] = i;
+            System.out.println("Do-While loop: i - " + i++);
+        } while (i < 5);
+        return arr;
+    }
+}
\ No newline at end of file
diff --git a/core-java/src/test/java/com/baeldung/loops/WhenUsingLoops.java b/core-java/src/test/java/com/baeldung/loops/WhenUsingLoops.java
new file mode 100644
index 0000000000..9590eabfef
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/loops/WhenUsingLoops.java
@@ -0,0 +1,37 @@
+package com.baeldung.loops;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class WhenUsingLoops {
+
+    private LoopsInJava loops = new LoopsInJava();
+
+    @Test
+    public void shouldRunForLoop() {
+        int[] expected = { 0, 1, 2, 3, 4 };
+        int[] actual = loops.simple_for_loop();
+        Assert.assertArrayEquals(expected, actual);
+    }
+
+    @Test
+    public void shouldRunEnhancedForeachLoop() {
+        int[] expected = { 0, 1, 2, 3, 4 };
+        int[] actual = loops.enhanced_for_each_loop();
+        Assert.assertArrayEquals(expected, actual);
+    }
+
+    @Test
+    public void shouldRunWhileLoop() {
+        int[] expected = { 0, 1, 2, 3, 4 };
+        int[] actual = loops.while_loop();
+        Assert.assertArrayEquals(expected, actual);
+    }
+
+    @Test
+    public void shouldRunDoWhileLoop() {
+        int[] expected = { 0, 1, 2, 3, 4 };
+        int[] actual = loops.do_while_loop();
+        Assert.assertArrayEquals(expected, actual);
+    }
+}