Java - Method With Parameter

class fun1
  {
    int a, b;

    void calc(int x,int y)
      {
         a = x;
         b = y;
      }

    void add()
      {
         System.out.println("\nAddition :"+(a+b));
      }

    void sub()
      {
         System.out.println("\nSubtraction :"+(a-b));
      }

    void mul()
      {
         System.out.println("\nMultiplication :"+(a*b));
      }

    void div()
      {
         System.out.println("\nDivision :"+(a/b));
      }

    void rem()
      {
         System.out.println("\nModules :"+(a%b));
      }

     public static void main(String arg[])
      {
         fun1 x;
         x = new fun1();

         x.calc(10,3);

         x.add();
         x.sub();
         x.mul();
         x.div();
         x.rem();
      }
 }