用java语言写一个文本编辑器

好的，我可以给你提供一个简单的Java文本编辑器的代码示例，你可以根据自己的需要进行修改和完善。代码如下：

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

public class TextEditor extends JFrame implements ActionListener {
    private JTextArea textArea;
    private JFileChooser fileChooser;

    public TextEditor() {
        super("Java文本编辑器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);

        textArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(textArea);
        add(scrollPane, BorderLayout.CENTER);

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        JMenu fileMenu = new JMenu("文件");
        menuBar.add(fileMenu);

        JMenuItem openItem = new JMenuItem("打开");
        openItem.addActionListener(this);
        fileMenu.add(openItem);

        JMenuItem saveItem = new JMenuItem("保存");
        saveItem.addActionListener(this);
        fileMenu.add(saveItem);

        fileChooser = new JFileChooser();
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals("打开")) {
            int returnVal = fileChooser.showOpenDialog(this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fileChooser.getSelectedFile();
                try {
                    BufferedReader reader = new BufferedReader(new FileReader(file));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        textArea.append(line + "\n");
                    }
                    reader.close();
                } catch (IOException ex) {
                    JOptionPane.showMessageDialog(this, "读取文件出错：" + ex.getMessage());
                }
            }
        } else if (e.getActionCommand().equals("保存")) {
            int returnVal = fileChooser.showSaveDialog(this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fileChooser.getSelectedFile();
                try {
                    BufferedWriter writer = new BufferedWriter(new FileWriter(file));
                    writer.write(textArea.getText());
                    writer.close();
                } catch (IOException ex) {
                    JOptionPane.showMessageDialog(this, "保存文件出错：" + ex.getMessage());
                }
            }
        }
    }

    public static void main(String[] args) {
        TextEditor editor = new TextEditor();
        editor.setVisible(true);
    }
}

这个文本编辑器基于Java Swing框架实现，可以打开和保存文本文件，代码比较简单易懂。