renameTo或delete（）无法正常工作

Question

我正在写一个＆＃34;删除＆＃34;文本文件中的一行。如何删除原始文件并重命名新文件失败。

会发生什么，它会在文件名＆＃34; temp.txt＆＃34;下保存我要保存的行。但它应该做的是删除原始文件（TaskList.txt）然后将temp.txt重命名为TaskList.txt任何人都可以帮忙吗？这是我的代码：

import java.io.*;
import java.io.File;
import java.awt.*;
import javax.swing.*;
import java.util.Scanner;
import java.awt.event.*;

class DeleteTask implements ActionListener{

  private static Scanner x;
  JFrame frame;
  JButton deleteButton;
  JTextField delete;
  JLabel label;

public void completedTask()
{
    frame = new JFrame();
    frame.setLayout(new BorderLayout());
    frame.setTitle("Delete Task");
    delete = new JTextField(10);
    deleteButton = new JButton("Delete");
    deleteButton.addActionListener(this);
    label = new JLabel ("Enter task name");

    frame.add(label,BorderLayout.WEST);
    frame.add(delete,BorderLayout.CENTER);
    frame.add(deleteButton,BorderLayout.SOUTH);

    frame.pack();
    frame.setVisible(true);
}

public void actionPerformed(ActionEvent event)
{
    String filePath = "TaskList.txt";
    String removeTerm= delete.getText();
    removeRecord(filePath,removeTerm);
    frame.dispose();
}   

public static void removeRecord(String filePath, String removeTerm)
{
    String tempFile = "temp.txt";
    File oldFile = new File(filePath);
    File newFile = new File(tempFile);
    String id = "" ;  String name = "" ; String age = ""; String descript = "";
    try
    {
        FileWriter fw = new FileWriter(tempFile,true);
        BufferedWriter bw = new BufferedWriter(fw);
        PrintWriter pw = new PrintWriter(bw);
        x = new Scanner(new File(filePath));
        x.useDelimiter("[,\n]");


        while(x.hasNext())
        {
            id = x.next();
            name = x.next();
            age = x.next();
            descript = x.next();
            if(!id.equals(removeTerm))
            {
                pw.println(id + ", " + name + ", " + age + ", " + descript);
            }
        }
            x.close();
            pw.flush();
            pw.close();
            oldFile.delete();
            File dump = new File(filePath);
            newFile.renameTo(dump);

    }
    catch(Exception E)
    {

    }
}
}