- Added guest contribution by Mohammad Meraj Zia.

1 files changed, 35 insertions, 0 deletions

diff --git a/challenge-163/ziameraj16/java/HappyNumbers.java b/challenge-163/ziameraj16/java/HappyNumbers.java
new file mode 100755
index 0000000000..bb93a2aacc
--- /dev/null
+++ b/challenge-163/ziameraj16/java/HappyNumbers.java
@@ -0,0 +1,35 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class HappyNumbers {
+
+    public static void main(String[] args) {
+        int c = 0;
+        for (int i = 0; c < 8; i++) {
+            if (isHappyNumber(i)) {
+                System.out.println(i);
+                c++;
+            }
+        }
+    }
+
+    private static boolean isHappyNumber(int i) {
+        List<Integer> list = new ArrayList();
+        while(i > 0) {
+            list.add(i % 10);
+            i = i / 10;
+        }
+        int sum = 0;
+        for (int j : list) {
+            sum = sum + j*j;
+        }
+        if (sum == 1) {
+            return true;
+        } else if (sum < 10) {
+            return false;
+        } else {
+            isHappyNumber(sum);
+        }
+        return false;
+    }
+}