class C0 {
}

class C1<T> extends C0 {
}

class C2<T> extends C1<T> {

}

class C3<T> extends C1<String> {
}

class Pair<T> {
    private T first;
    private T second;

    public Pair(T x1, T x2) {
        first = x1;
        second = x2;
    }

    public <S> void display(S head1, S head2) {
        System.out.println("(" + head1 + ")" + first + ", (" + head2 + ")" + second);
    }

    public <S extends Comparable<S>> void showHigherCost(S cost1, S cost2) {
        S higher = cost1.compareTo(cost2) > 0 ? cost1 : cost2;
        if (higher == cost1)
            System.out.printf("More expensive: " + first + " $" + higher);
        else
            System.out.println("More expensive: " + second + " $" + higher);
    }
}

public class Main {
    public static void main(String[] args) {
        Pair<String> p = new Pair<String>("Orange", "Pear");
        p.<String>display("a", "b");
        p.<Integer>display(1, 2);
        p.<Double>showHigherCost(10.0, 20.0);

        p.display("a", "b");
        p.display(1, 2);
        p.showHigherCost(10.0, 20.0);
    }
}

/*
(a)Orange, (b)Pear
(1)Orange, (2)Pear
More expensive: Pear $20.0
(a)Orange, (b)Pear
(1)Orange, (2)Pear
More expensive: Pear $20.0
*/