package w8;

public class Pair<k,v> {
    private k key;
    private v value;
    public Pair(k key,v value){
        this.key=key;
        this.value=value;
    }
    public k getkey(){
        return key;
    }
    public v getvalue(){
        return value;
    }
    public static <k,v> Pair<v,k> swap(Pair<k,v> pair){
        return new Pair<>(pair.getvalue(),pair.getkey());
    }
}
class PairTest {
    public static void main(String[] args) {
        Pair<Integer,String> pair=new Pair<>(1,"a");
        System.out.println(pair.getkey());
        System.out.println(pair.getvalue());
        Pair<String,Integer> pair2=Pair.swap(pair);
        System.out.println(pair2.getkey());
        System.out.println(pair2.getvalue());
    }
}