用Java写一个弹出窗口的汽车管理系统，要求用文件输入输出，汽车管理系统包含了添加、删除、清空和查看所有车辆的功能

好的，下面是一个简单的Java代码实现：

import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;

public class CarManagementSystem extends JFrame implements ActionListener{
    private JLabel lblMake, lblModel, lblYear, lblPrice;
    private JTextField txtMake, txtModel, txtYear, txtPrice;
    private JButton btnAdd, btnDelete, btnClear, btnViewAll;

    private File file = new File("cars.txt"); // 文件名
    private String[] headers = {"Make", "Model", "Year", "Price"};

    public CarManagementSystem(){
        setTitle("Car Management System");

        // 标签和文本框
        lblMake = new JLabel("Make:");
        txtMake = new JTextField(20);

        lblModel = new JLabel("Model:");
        txtModel = new JTextField(20);

        lblYear = new JLabel("Year:");
        txtYear = new JTextField(20);

        lblPrice = new JLabel("Price:");
        txtPrice = new JTextField(20);

        // 按钮
        btnAdd = new JButton("Add");
        btnAdd.addActionListener(this);

        btnDelete = new JButton("Delete");
        btnDelete.addActionListener(this);

        btnClear = new JButton("Clear");
        btnClear.addActionListener(this);

        btnViewAll = new JButton("View All");
        btnViewAll.addActionListener(this);

        // 布局
        JPanel panel1 = new JPanel(new GridLayout(4, 2));
        panel1.add(lblMake);
        panel1.add(txtMake);
        panel1.add(lblModel);
        panel1.add(txtModel);
        panel1.add(lblYear);
        panel1.add(txtYear);
        panel1.add(lblPrice);
        panel1.add(txtPrice);

        JPanel panel2 = new JPanel(new FlowLayout());
        panel2.add(btnAdd);
        panel2.add(btnDelete);
        panel2.add(btnClear);
        panel2.add(btnViewAll);

        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(panel1, BorderLayout.CENTER);
        contentPane.add(panel2, BorderLayout.SOUTH);

        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == btnAdd){
            String make = txtMake.getText();
            String model = txtModel.getText();
            String year = txtYear.getText();
            String price = txtPrice.getText();

            try {
                // 写入文件
                FileWriter writer = new FileWriter(file, true);
                writer.write(make + "," + model + "," + year + "," + price + "\n");
                writer.close();

                JOptionPane.showMessageDialog(this, "Car added successfully!");
            } catch (IOException ex) {
                ex.printStackTrace();
            }

        }else if(e.getSource() == btnDelete){
            String make = JOptionPane.showInputDialog(this, "Enter make of car to delete:");

            try {
                // 读取文件
                BufferedReader reader = new BufferedReader(new FileReader(file));
                String line;
                StringBuilder sb = new StringBuilder();

                while((line = reader.readLine()) != null){
                    if(line.startsWith(make)){
                        continue; // 删除此行
                    }
                    sb.append(line);
                    sb.append(System.lineSeparator());
                }
                reader.close();

                // 写入文件
                FileWriter writer = new FileWriter(file);
                writer.write(sb.toString());
                writer.close();

                JOptionPane.showMessageDialog(this, "Car deleted successfully!");
            } catch (IOException ex) {
                ex.printStackTrace();
            }

        }else if(e.getSource() == btnClear){
            try {
                // 清空文件
                FileWriter writer = new FileWriter(file);
                writer.write("");
                writer.close();

                JOptionPane.showMessageDialog(this, "All cars deleted successfully!");
            } catch (IOException ex) {
                ex.printStackTrace();
            }

        }else if(e.getSource() == btnViewAll){
            try {
                // 读取文件
                BufferedReader reader = new BufferedReader(new FileReader(file));
                String line;
                StringBuilder sb = new StringBuilder();

                while((line = reader.readLine()) != null){
                    sb.append(line);
                    sb.append(System.lineSeparator());
                }
                reader.close();

                // 显示数据
                String data = sb.toString();
                if(data.length() > 0){
                    String[] rows = data.split(System.lineSeparator());

                    JTable table = new JTable(rows.length, headers.length);
                    for(int i=0; i<headers.length; i++){
                        table.getColumnModel().getColumn(i).setHeaderValue(headers[i]);
                    }

                    for(int i=0; i<rows.length; i++){
                        String[] values = rows[i].split(",");
                        for(int j=0; j<values.length; j++){
                            table.setValueAt(values[j], i, j);
                        }
                    }

                    JScrollPane scrollPane = new JScrollPane(table);
                    JOptionPane.showMessageDialog(this, scrollPane);

                }else{
                    JOptionPane.showMessageDialog(this, "No cars found!");
                }

            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        new CarManagementSystem();
    }
}

上述代码实现了一个简单的汽车管理系统，可以添加、删除、清空和查看所有车辆。使用文件输入输出进行数据持久化。其中，添加和删除操作会将数据写入文件；查看所有车辆会从文件中读取数据并展示到一个表格中。