Question

此程序仅用于if语句以三个数字作为用户输入，然后按升序将它们打印到屏幕上。但是，当我尝试运行此代码时，我收到以下输出：

Enter first number: Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:862)
    at java.util.Scanner.next(Scanner.java:1485)
    at java.util.Scanner.nextInt(Scanner.java:2117)
    at java.util.Scanner.nextInt(Scanner.java:2076)
    at OrderNumbers.main(OrderNumbers.java:10)

这是我目前正在运行的代码：

import java.util.*;

public class OrderNumbers{
   public static void main(String[] args){
      Scanner scan = new Scanner(System.in);

      System.out.print("Ordering 3 whole numbers \n");

      System.out.print("Enter first number: ");
      int numberOne = scan.nextInt();
      System.out.print("Enter second number: ");
      int numberTwo = scan.nextInt();
      System.out.print("Enter third number: ");
      int numberThree = scan.nextInt();

      if( numberOne > numberTwo && numberTwo > numberThree){
         System.out.println( "Ordered numbers are: " + numberThree + ", " + numberTwo + ", " + numberOne);
      }
      else if( numberOne > numberTwo && numberThree > numberTwo) {
         System.out.println( "Ordered numbers are: " + numberTwo + ", " + numberThree + ", " + numberOne);
      }
      else if( numberTwo > numberOne && numberOne > numberThree) {
         System.out.println( "Ordered numbers are: " + numberThree + ", " + numberOne + ", " + numberTwo);
      }
      else if( numberTwo > numberOne && numberOne < numberThree) {
         System.out.println( "Ordered numbers are: " + numberOne + ", " + numberThree + ", " + numberTwo);
      }
      else if( numberThree > numberOne && numberOne < numberTwo) {
         System.out.println( "Ordered numbers are: " + numberOne + ", " + numberTwo + ", " + numberThree);
      }
      else if( numberThree > numberOne && numberOne > numberTwo){
         System.out.println( "Ordered numbers are: " + numberTwo + ", " + numberOne + ", " + numberThree);
      }
   }
}

我不知道错误在哪里，但任何帮助都会受到赞赏。

Answer 1

可能会抛出异常，因为您没有输入数字。您应检查输入是否为input.hasNextInt()的数字，如果input.next()（返回String）不是这种情况，则应检查打印错误，以查看您从输入中获取的内容。< / p>

如何从java中的命令行获取整数作为用户输入？

1 个答案: