java - 为什么我的异常处理错误会导致无限循环？

Question

我的异常处理遇到了麻烦。如果我输入一个数字，程序运行正常，但如果输入一个字符，则创建一个无限循环。

boolean ask= true;
    while(ask)
    {
        ask = false;
        try 
        {
            System.out.println("What is the age?");
            int age = input.nextInt();  
            setAge(age);
        }catch(InputMismatchException e) {
            System.out.println("Invalid input!");
            ask = true;
        }
    }//end while

Answer 1

尝试下面的代码:

      boolean ask= false;
        while(!ask)
        {
           try
           {
               System.out.println("What is the age?");
               int age = input.nextInt();//does not read the newline character in your input created by hitting "Enter,"
               setAge(age);
               ask = true;
           }catch(InputMismatchException e) {
               System.out.println("Invalid input!");
               input.nextLine();//consumes the \n character
           }
        }//end while