Java.Util.Scanner的NoSuchElementException

我是Java的新手,但是正在阅读《 Java:如何编程》(第9版)一书,并举了一个例子,在我的一生中,我无法弄清楚问题出在哪里。

这是教科书中源代码示例的(略)增强版本:

import java.util.Scanner;

public class Addition {

public static void main(String[] args) {

// creates a scanner to obtain input from a command window

Scanner input = new Scanner(System.in);

int number1; // first number to add

int number2; // second number to add

int sum; // sum of 1 & 2

System.out.print("Enter First Integer: "); // prompt

number1 = input.nextInt(); // reads first number inputted by user

System.out.print("Enter Second Integer: "); // prompt 2

number2 = input.nextInt(); // reads second number from user

sum = number1 + number2; // addition takes place, then stores the total of the two numbers in sum

System.out.printf( "Sum is %d\n", sum ); // displays the sum on screen

} // end method main

} // end class Addition

我收到“NoSuchElementException”错误:

Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Scanner.java:838)

at java.util.Scanner.next(Scanner.java:1461)

at java.util.Scanner.nextInt(Scanner.java:2091)

at java.util.Scanner.nextInt(Scanner.java:2050)

at Addition.main(Addition.java:16)

Enter First Integer:

我知道这可能是由于源代码中的某些内容与Scannerfrom中的类不兼容所致java.util,但是在推断出问题所在的方面,我确实无法获得更多的帮助。

回答:

NoSuchElementExceptionnextElement枚举方法抛出以指示枚举中没有更多元素。

http://docs.oracle.com/javase/7/docs/api/java/util/NoSuchElementException.html

这个怎么样 :

if(input.hasNextInt() )

number1 = input.nextInt(); // if there is another number

else

number1 = 0; // nothing added in the input

以上是 Java.Util.Scanner的NoSuchElementException 的全部内容, 来源链接: utcz.com/qa/402024.html

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