Generic Box

Lab Java Intermediate 20 points

Write class Box<T> with set, get and isEmpty. Store a String and an Integer in two boxes and print their contents and the Integer doubled.

Input

Line 1: a word. Line 2: an integer.

Output

Three lines.

Example

Input

hello
21

Output

hello
21
42

Sample input available Sample output available

Editor

Java

Hints

T is a type parameter - a placeholder for the real type.

Solution explanation

Generics give type safety without casts: number.get() is already an Integer.

Show solution

import java.util.Scanner;

class Box<T> {
    private T value;

    void set(T value) {
        this.value = value;
    }

    T get() {
        return value;
    }

    boolean isEmpty() {
        return value == null;
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Box<String> word = new Box<String>();
        Box<Integer> number = new Box<Integer>();
        word.set(sc.next());
        number.set(sc.nextInt());
        System.out.println(word.get());
        System.out.println(number.get());
        System.out.println(number.get() * 2);
    }
}

Output

Answer