初学者习题练习。从键盘上输入一位整数，当输入1-7时，显示下面对应的英文姓起名称的缩写。 1：MON 2:TUE 3:WED 4:THU 5:FRI 6:SAT 7:SUN 输入其他数字时提示用户重新输入，输入数字0时程序结束。

import java.util.*;

public class Demo12 {

public static void main(String[] args) {
boolean kaiGuan = true;
Scanner input = new Scanner(System.in);
for (; kaiGuan;) {
System.out.println("请输入你的数字：");
int num = input.nextInt();
switch (num) {
case 1:
System.out.println("1：MON");

break;
case 2:
System.out.println("2:TUE");

break;
case 3:
System.out.println("3:WED");

break;
case 4:
System.out.println("4:THU");

break;
case 5:
System.out.println("5:FRI");

break;
case 6:
System.out.println("6:SAT");

break;
case 7:
System.out.println("7:SUN");

break;
case 0:
kaiGuan = false;

break;

default:
System.out.println("输入错误，重新输入");
break;
}

}
System.out.println("程序结束");

}

}