SAS

public class Adder{

    private String add(String s1,String s2){
        return s1+s2;
    }

    private int add(int b1,int b2){
        return b1+b2;
    }

    public static void main(String[] args){
        Adder a=new Adder();
        System.out.println(a.add(1,2));
        System.out.println(a.add("ciao"," come stai?"));
    }
}