通过trycatch避免inputmismatch

发布于 2025-01-24 21:15:36 字数 774 浏览 2 评论 0原文

要验证INT输入，我已经看到了使用InputMismatch异常的try-catch的用法。不过，在输入字符串后，我只是播放了捕获代码块，然后由于不匹配而退出程序，但是我想允许用户重新输入输入。搜索后循环时，我在循环时实现了一个布尔值，但这仍然没有解决问题。

        int quantity = 0;
        boolean correct = true;
        while(correct){
            try{
                System.out.print("Input Quantity you would like to purchase: ");//Get quantity
                quantity = input.nextInt();
            }catch(InputMismatchException e){
                System.out.println("Input must be a number");
                input.nextInt();//Get the input as a string
                correct = false;
            }
            System.out.println("Quantity: " + quantity);
        }

我以前刚刚使用了扫描仪内置的Hasnextint，它效果很好，但想测试Try-Catch。我听说要使用try-catch而不使用try-catch。为什么我要避免使用它？

原文

To validate for an int input, I've seen the usage of try-catch using the InputMismatch exception. After inputting a string though, I simply get the catch code block played, then my program exits due to mismatch, but instead I want to allow the user to re-enter input. I implemented a boolean correct while loop after searching around but that still didn't do the trick.

        int quantity = 0;
        boolean correct = true;
        while(correct){
            try{
                System.out.print("Input Quantity you would like to purchase: ");//Get quantity
                quantity = input.nextInt();
            }catch(InputMismatchException e){
                System.out.println("Input must be a number");
                input.nextInt();//Get the input as a string
                correct = false;
            }
            System.out.println("Quantity: " + quantity);
        }

I previously just used the Scanner's built in hasNextInt, and that works great, but wanted to test out try-catch. I've heard to use try-catch and not to use try-catch. Why would I avoid using it?

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紫轩蝶泪 2025-01-31 21:15:36

这是修复程序，使用input.nextline（）;在捕获中，并且不要使正确= false，

while(correct){
            try{
                System.out.print("Input Quantity you would like to purchase: ");//Get quantity
                quantity = input.nextInt();
            }catch(InputMismatchException e){
                System.out.println("Input must be a number");
                input.nextLine();
                continue;
            }
            System.out.println("Quantity: " + quantity);
        }

但就像其他指出的那样，尽量不要使用常规流程。仅将其用于跟踪异常例外。因此，我阻止您使用此代码。使用，input.hasnextint（）而不是

Here is the fix, use input.nextLine(); in catch and don't make the correct=false

while(correct){
            try{
                System.out.print("Input Quantity you would like to purchase: ");//Get quantity
                quantity = input.nextInt();
            }catch(InputMismatchException e){
                System.out.println("Input must be a number");
                input.nextLine();
                continue;
            }
            System.out.println("Quantity: " + quantity);
        }

But like others pointed out, try not to use Exceptions for general flow. Use it only for tracking unusual exceptions. So, I am discouraging you to use this code. Use, input.hasNextInt() instead

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