如何使用循环语句而不是go to语句

Question

 while(true)
    {
  
        switch (...)
        {
            case 1:
                //some code
                break;
            case 2:
                //some code
                break;
        }


        System.out.println("(1)Continue (2)Exit");

   //example:

        int choice = scanner.nextInt();

        if (choice == 1)
            continue; //it should go to switch

        else if (choice == 2)
        {
            System.out.println("Exit..."); // should exit
            break;
        }

 
        else
        {
            System.out.println("Wrong num, try it again!"); // should ask choose again until we enter 1 or 2

            //goto example;
        }

    }

我的问题是：当我选择错误的数字时，它会转到循环的开始。我希望它转到要求选择的部分（int choice=scanner.nextInt（）；）再问一遍。“1”->切换，“2”->“退出”，“3”->再次询问选择。

Answer 1

这应该能解决你的问题。

import java.util.Scanner;

class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        
      
            switch (0)
            {
                case 1:
                    //some code
                    break;
                case 2:
                    //some code
                    break;
            }


            System.out.println("(1)Continue (2)Exit");

        while(true)
        {
            int choice = sc.nextInt();

            if (choice == 1)
                continue;

            else if (choice == 2)
            {
                System.out.println("Exit...");
                break;
            }
            
            else
            {
                System.out.println("Wrong num, try it again!");
            }

        }
    }
}

如果您有其他要求，请更新您的问题。