如何修复InputMismatchException

Question

所以我有这样的代码：

protected void giveNr(Scanner sc) {
    //variable to keep the input
    int input = 0;
    do {
      System.out.println("Please give a number between: " + MIN + " and " + MAX);
      //get the input
      input = sc.nextInt();
    } while(input < MIN || input > MAX);
}

如果输入的内容不是整数，比如字母或字符串，程序就会崩溃，并给出错误InputMismatchException。我如何修复它，以便当输入了错误的输入类型时，再次要求人类输入(并且程序不会崩溃？)

Answer 1

您可以捕获InputMismatchException，打印一条错误消息，告诉用户哪里出了问题，然后再次循环：

int input = 0;
do {
    System.out.println("Please give a number between: " + MIN + " and " + MAX);
    try {
        input = sc.nextInt();
    }
    catch (InputMismatchException e) {
        System.out.println("That was not a number.  Please try again.");
        input = MIN - 1; // guarantee we go around the loop again
    }
while (input < MIN || input > MAX)