使用户仅在扫描仪Java中输入整数 [英] Make user only input integer in scanner Java

问题描述

我在这里遇到一些问题.我只想用户可以输入为整数.我已经尝试了许多代码，但仍然无法正常工作.顺便说一句，这是我的代码

i have some problems here. I want to user only can input as an integer. I have tried by many code, but still doesn't work. Btw, this is my code

import java.util.Scanner;

public class test { 
  public static void main (String []args){
    Scanner scan = new Scanner(System.in);
    int number = scan.nextInt();
  }
}

出现错误时，消息将显示为

When error, the message will shown as

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at test.main(test.java:6)

请帮助我(初级程序员)；

Please help me (Beginner Programmer);

推荐答案

  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    while (!scan.hasNextInt()) {
      System.out.println("Input is not a number.");
      scan.nextLine();
    }
    int number = scan.nextInt();
  }

此代码将检查输入是否为整数，如果为整数则将继续输入.

This code will check if the input is an Integer, if it is then it will continue.

这篇关于使用户仅在扫描仪Java中输入整数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！