Java 程序：输入数字显示星期几

import java.util.Scanner;

public class Weekday {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print('请输入一个数字（0~6）：');
    int num = input.nextInt();
    switch(num) {
        case 0:
            System.out.println('星期日');
            break;
        case 1:
            System.out.println('星期一');
            break;
        case 2:
            System.out.println('星期二');
            break;
        case 3:
            System.out.println('星期三');
            break;
        case 4:
            System.out.println('星期四');
            break;
        case 5:
            System.out.println('星期五');
            break;
        case 6:
            System.out.println('星期六');
            break;
        default:
            System.out.println('输入错误！');
    }
}