无法弄清楚如何捕获InputMismatchException [英] Cannot Figure out how to catch InputMismatchException

问题描述

所以这是我当前用于捕获InputMismatchException错误的代码

So here is my current code for catching an InputMismatchException error

int weapon = 0
   boolean selection = true;
   while(selection) {
    try {
      System.out.println("Pick number 1, 2, or 3.");
      weapon = scan.nextInt(); 
      selection = false;
    } catch(InputMismatchException e) {
        System.out.println("Choose 1,2,3");
        weapon = scan.nextInt();
      }
   }

我正在努力确保int是输入而不是其他任何东西。
扫描仪课程已经实施，扫描将对我有效。

I'm trying to make sure that an int is entered and not anything else. Scanner class as already been implemented and 'scan' will act as it for me.

感谢您的帮助！

推荐答案

试试这个：

int weapon = 0;
   do{
       System.out.println("Pick number 1, 2, or 3.");
       if(scan.hasNextInt()){
           weapon = scan.nextInt();
           break;
       }else{
           System.out.println("Enter an integer only");
           scan.nextLine();
       }
   }while(true);

这将确保它是一个整数，它会一直询问直到它得到它。

This will make sure it is an integer and it will keep asking until it gets it.

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