while（）循环用于用户输入 [英] while() loop for user input

问题描述

我正在设置一个 while（），直到用户输入一个整数为止。但是，就我现在的方式而言，循环在输入整数后再次打印消息请输入一个整数，然后程序正常执行。有人建议在输入整数后再次打印该消息的方法吗？谢谢！

I'm working on setting up a while() that executes until the user enters an integer. However, the way I have it now, the loop prints the message "Please enter an integer" again after the integer has been entered, and then the program executes normally. Can someone suggest a way to make not print that message again after an integer has been entered? Thanks!

            System.out.println("Enter word length");
            if(in.hasNextInt())
            {    
                n = in.nextInt();
            }
            else
            {
                while(in.hasNext()) //this is the loop i'm talking about
                {
                    System.out.println("Please enter an integer");
                    if(in.hasNextInt())
                    {    
                        n = in.nextInt();
                        break;
                    }
                    else
                    {
                        String c = in.next();
                    }
                }
            }      

推荐答案

我假设您希望用户输入int（或Integer）并反复询问用户，直到用户输入int（或Integer）。如果是这样，试试这个：

I am assuming that you want user to enter int (or Integer) and repeatedly ask user until user enters int(or Integer). If so, try this:

System.out.println("Enter word length");
if(in.hasNextInt()) {    
    n = in.nextInt();
 } else {
         while(in.hasNext()) //this is the loop i'm talking about
         {

             if(in.hasNextInt())
             {    
                 n = in.nextInt();
                 break;
             }
             else
             {
                 String c = in.next();
                 System.out.println("Please enter an integer");
             }
         }
     }      

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