如何用某个变量结束while循环

Question

我正在用while循环编写奇数或偶数程序。我试图弄清楚如何以某个数字结束while循环。现在我有1个继续循环，并尝试使2终止循环。还试图弄清楚如果用户键入除字母/单词之类的数字以外的任何内容，如何终止程序。

package oddoreven;
import java.util.Scanner;

public class oddoreven {
    public static void main (String[] args){            
        int num;
        int x = 1;
        while(x == 1) {
            System.out.println("Enter a number to check whether or not it is odd or even");
            Scanner s = new Scanner(System.in);
            num = s.nextInt();
            if (num % 2 == 0)
                System.out.println("The number is even");
            else 
                System.out.println("The number is odd");
            //trying to figure out how to get the code to terminate if you put in a value that isn't a number
            System.out.println("Type 1 to continue, 0 to terminate");
            x = s.nextInt();
        }

    }

}

Answer 1

您可以尝试的另一件事是，您可以继续要求用户输入正确的输入，而不是退出程序，只有在输入正确的输入后才继续操作。我不知道您的要求是什么，但是如果您想通过良好的代码习惯进行操作，则不应仅因为用户输入了错误的输入而终止程序。想象一下，如果您用错字搜索了一个单词，而Google刚刚关闭。

反正这就是我的做法

import java.util.Scanner;

public class oddoreven {
    public static void main(String[] args) {
        int num;
        int x = 1;
        while (x == 1) {
            System.out.println("Enter a number to check whether or not it is odd or even");
            Scanner s = new Scanner(System.in);

            boolean isInt = s.hasNextInt(); // Check if input is int
            while (isInt == false) { // If it is not int
                s.nextLine(); // Discarding the line with wrong input
                System.out.print("Please Enter correct input: "); // Asking user again
                isInt = s.hasNextInt(); // If this is true it exits the loop otherwise it loops again
            }
            num = s.nextInt(); // If it is int. It reads the input

            if (num % 2 == 0)
                System.out.println("The number is even");
            else
                System.out.println("The number is odd");
            // trying to figure out how to get the code to terminate if you put in a value
            // that isn't a number
            System.out.println("Type 1 to continue, 0 to terminate");
            x = s.nextInt();
        }

    }
}