Java重载

public class Sample{

   public int add(int a, int b){

      int c = a+b;

      return c;

   }

   public void add(int a, int b, int c){

      int z = a+b+c;

      System.out.println(z);

   }

   public static void main(String args[] ){

      Sample obj = new Sample();

      System.out.println(obj.add(40, 50));

      obj.add(40, 50, 60);

   }

}