Generic Pair

Lab Java Intermediate 20 points

Write class Pair<A, B> with first(), second(), swap() (returns Pair<B, A>) and toString (a, b). Read a name and an age, make a pair, print it and its swap.

Input

One line: name age.

Output

Two lines.

Example

Input

Ada 36

Output

(Ada, 36)
(36, Ada)

Sample input available Sample output available

Editor

Java

Hints

A class can have several type parameters.

Solution explanation

swap() shows that generic types can be rearranged in return types.

Show solution

import java.util.Scanner;

class Pair<A, B> {
    private final A a;
    private final B b;

    Pair(A a, B b) {
        this.a = a;
        this.b = b;
    }

    A first() { return a; }

    B second() { return b; }

    Pair<B, A> swap() {
        return new Pair<B, A>(b, a);
    }

    @Override
    public String toString() {
        return "(" + a + ", " + b + ")";
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Pair<String, Integer> p = new Pair<String, Integer>(sc.next(), sc.nextInt());
        System.out.println(p);
        System.out.println(p.swap());
    }
}

Output

Answer