java - 将 sLine 字符串解析为整数时出错

Question

这段代码只是一个文件读取器，它没有显示任何错误，但是当我运行它时，这一行似乎出现错误: int temp2 = Integer.parseInt(temp[x]);

为什么这个变量似乎无法解析为整数？

public void loadRecordTimes(){

    //get each time from the text file
    try{
        File f = new File ("Times.txt"); 
        //appends content to file
        FileReader fr = new FileReader(f);
        //bufferedwriter writer give better performance
        BufferedReader br = new BufferedReader(fr);

        //reads a line from the text file
        String sLine = br.readLine();

        //as long as something was read from the file, it will keep running
        while (sLine != null){               
            //take the line that was read and split it based on on the comma
            String[] temp = sLine.split(",");

            for (int x = 0; sLine != null; x++){        

            System.out.println(temp[x]);

            int temp2 = Integer.parseInt(temp[x]);
            //adds recorded times from content file to array
            recordTimes.add(temp2);

            }

            sLine = br.readLine();     
        }

    br.close();
    fr.close();

    }

    catch(IOException e){

    System.out.println("Exception occured:");
    e.printStackTrace();

    }    

} 

这是我的 IDE 给我的错误消息(如果有帮助的话):

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:580)
        at java.lang.Integer.parseInt(Integer.java:615)
        at GlobeTrotter.loadRecordTimes(GlobeTrotter.java:912)
        at GlobeTrotter.<init>(GlobeTrotter.java:54)
        at GlobeTrotter$22.run(GlobeTrotter.java:1460)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Answer 1

要修复 NumberFormatException，只需删除文本文件末尾的所有空格即可。当您尝试解析末尾的空格或换行符时，会引发异常。

执行此操作后，该行代码中出现另一个错误:

for (int x = 0; sLine != null; x++){ 

sLine != null 不是正确的停止条件，因为当编译器到达这一行时它始终为 true。因此，它在到达数组末尾后继续，并将抛出 IndexOutOfBoundsException

要修复该问题，请将其替换为:

for (int x = 0; x < temp.length; x++){