diff --git a/code25 b/code25
new file mode 100644
index 0000000..d2c3f5e
--- /dev/null
+++ b/code25
@@ -0,0 +1,25 @@
+class Main {
+
+  // calculate the sum
+  public int add(int a, int b) {
+
+    // calculate sum
+    int sum = a + b;
+    return sum;
+  }
+
+  // calculate the square
+  public void square(int num) {
+    int result = num * num;
+    System.out.println(result);    // prints 576
+  }
+  public static void main(String[] args) {
+
+    Main obj = new Main();
+
+    // call the square() method
+    // passing add() as an argument
+    obj.square(obj.add(15, 9));
+
+  }
+}