public class Calculadora{

       private int n1,n2;

       public void sumar(int n1,int n2){
              int res;
              res=n1+n2;
              System.out.println("El resultado es: "+res);

       }
       public void restar(int n1,int n2){
              int res;
              res=n1-n2;
       }

}