resolved the issue and added code of squaring of any number in java

Java/SquareOfNum.txt

@@ -0,0 +1,35 @@
+//Hey,This is the java code for finding square of any number! - NikhilSharma
+
+import java.util.*;
+
+class SquareOfNum {
+    public static void main(String[] args) {
+        //Taking input number from the user using scanner class
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter number : ");
+        long num = sc.nextLong();
+
+
+        /*
+        created generateSquare function that takes num as input
+        and return squared value of num as output
+        */
+
+        long squaredNum = generateSquare(num);
+
+        //printing the squared value to screen
+        System.out.println("Squared number : " + squaredNum);
+    }
+
+    static long generateSquare(long num){
+        /*
+        we can square the number in many ways:
+
+        1. just multiplying the number with itself - num*num
+        2. using pow function in math class - Math.pow(num,2);
+
+        */
+
+        return num * num;
+    }
+}