public class Method
    public static void main (String [] args){
        int result1 = sun (10,20);
        System.out.pritnln(result1);
 //输出的值为30
        double result2 = sun (10.0,20.5);
        System.out.pritnln(result2);
 //输出的值为30.5
        int result3 = sun (10,20,30);
        System.out.pritnln(result3);
 //输出的值为60
}
        public void sun(int a,int b){
        result a+b;
}
         public void sun(double a,double b){
        result a+b;
}
         public void sun(int a,int b, int c){
        result a+b+c;
}