Question

编写一个程序，要求用户输入一年。然后该程序应根据中国十二生肖指示其年份类型。

您将需要：

用于输入的扫描仪对象输入验证：确保输入的年份为正数！（对此部分使用while循环。）用于存储输入年份的变量用于选择适当的星座的开关语句

输出示例如下所示：输入年份：-89 请输入anno domini（AD）年份！重新进入年份：1989年 1989年是蛇的一年

当我运行代码并输入一年时，代码会继续运行并重复自身。如何制作它只打印一次？

import java.util.Scanner;

public class ChineseZodiac {

    public static void main(String[] args) {
        int year;
        Scanner in = new Scanner(System.in);

        System.out.print("Enter a year: ");
        year = in.nextInt();

        while (year != 0)
        {
            switch (year % 12) 
            {
            case 0: 
            {
                System.out.println("The year " + year + " is the year of the Monkey"); 
            break;
            }

            case 1: 
            {   
                System.out.println("The year " + year + " is the year of the Rooster"); 
            break;
            }

            case 2: 
            {   
                System.out.println("The year " + year + " is the year of the Dog"); 
            break;
            }

            case 3: 
            {
                System.out.println("The year " + year + " is the year of the Pig"); 
            break;
            }

            case 4:
            {
                System.out.println("The year " + year + " is the year of the Rat"); 
            break;
            }

            case 5: 
            {   
                System.out.println("The year " + year + " is the year of the Ox"); 
            break;
            }

            case 6: 
            {
                System.out.println("The year " + year + " is the year of the Tiger"); 
            break;
            }

            case 7: 
            {
                System.out.println("The year " + year + " is the year of the Rabbit"); 
            break;
            }

            case 8: 
            {   
                System.out.println("The year " + year + " is the year of the Dragon"); 
            break;
            }

            case 9: 
            {   
                System.out.println("The year " + year + " is the year of the Snake"); 
            break;
            }

            case 10: 
            {   
                System.out.println("The year " + year + " is the year of the Horse"); 
            break;
            }

            case 11: 
            {
                System.out.println("The year " + year + " is the year of the Sheep"); 
            break;
            }
        }

    }

}

}

Answer 1

while要求年份等于0结束，但问题是你永远不会改变循环内的年份值，所以它会不断重复。

Answer 2

....代码继续运行并重复自己。我怎么做到这一点它只打印一次？..

您有while，它将一直循环到year=0

while (year != 0)
{

应该是

if (year != 0)
{

此外，没有任何意义，因为它永远不会执行case 0。下面的代码行是没用的。

case 0: 
        {
            System.out.println("The year " + year + " is the year of the Monkey"); 
        break;
        }

虽然循环和开关不断重复

2 个答案: