Java Program to find area and perimeter of a square

//Program to find area and perimeter of a square
import java.util.*;
class areaofs
     {
public static void main(String args[])
      {
    int a,area;
    System.out.println(" Enter the side of a square :");
    Scanner obj=new Scanner(System.in);
    a=obj.nextInt();
    System.out.println(" Area of a square : "+a*a);
    System.out.println(" Perimeter of square : "+4*a);
      }
    }