1class Pair<K, V> {
2    private K first;
3    private V second;
4 
5    public Pair(K first, V second) {
6        this.first = first;
7        this.second = second;
8    }
9 
10    public K getFirst() { return first; }
11    public V getSecond() { return second; }
12}
13 
14public class Main {
15    public static void main(String[] args) {
16        Pair<String, Integer> p = new Pair<>("age", 25);
17        System.out.println(p.getFirst());
18        System.out.println(p.getSecond());
19    }
20}