扫描器，nextInt和InputMismatchException

本文介绍了扫描器，nextInt和InputMismatchException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 我试图读取一个文本文件，然后使用Java中的nextInt（）函数在循环中打印出整数。我的文本文件格式为： $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ d 5000 6

这里是我的代码：

public static void main（String [] args）throws FileNotFoundException { String fileSpecified = args [0] +.txt; FileReader fr = new FileReader（fileSpecified）; BufferedReader br = new BufferedReader（fr）; 扫描仪输入=新扫描仪（br）; （in.hasNextLine（））{ System.out.println（next int =+ in.nextInt（））; while（in.hasNextLine $ / code $ / pre $ b $我得到的错误是：

pre $ 异常在线程mainjava.util.InputMismatchException $ b $在java.util.Scanner.throwFor（未知源）在java.util.Scanner.next（未知源）$ b $在java.util.Scanner.nextInt（未知源）$ b $在java.util.Scanner.nextInt（未知源）

每当我在任何程序中使用nextInt（）时，都会得到这个错误。

while（in.hasNext）

（））{ System.out.println（letter =+ in.next（））; System.out.println（integer1 =+ in.nextInt（））; System.out.println（integer2 =+ in.nextInt（））; }

I'm trying to read a text file and then print out the integers in a loop using the nextInt() function in Java. The text file I have is of the form:

a 2000 2 b 3000 1 c 4000 5 d 5000 6

Here is my code:

public static void main(String[] args) throws FileNotFoundException { String fileSpecified = args[0] + ".txt"; FileReader fr = new FileReader(fileSpecified); BufferedReader br = new BufferedReader (fr); Scanner in = new Scanner (br); while (in.hasNextLine()) { System.out.println ("next int = " + in.nextInt()); } }

The error I always get is:

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)

I get this error everytime I use nextInt() in any program.

解决方案

You probably want something like this instead:

while (in.hasNext()) { System.out.println("letter = " + in.next()); System.out.println("integer1 = " + in.nextInt()); System.out.println("integer2 = " + in.nextInt()); }