//Topic07 Generic Programming P.11

class Pair {
    public Object first;
    public Object second;

    public Pair() {
    }

    public Pair(Object first, Object second) {
        this.first = first;
        this.second = second;
    }

    @Override
    public String toString() {
        return "(1)" + first + " (2)" + second;
    }
}

public class Main {
    public static void main(String[] args) {
        System.out.println("Demo Pair (Generic)\n=====================");

        Pair p0 = new Pair();
        Pair p1 = new Pair("hello", "cheers");
        Pair p5 = new Pair(123, "cheers");

        System.out.println(p0); // (1)null (2)null
        System.out.println(p1); // (1)hello (2)cheers
        System.out.println(p5); // (1)123 (2)cheers

        System.out.println(p1.first.getClass().toString());
        System.out.println(p5.first.getClass().toString());
        System.out.println(p1.second.getClass().toString());
        System.out.println(p5.second.getClass().toString());

    }
}