使用Java语言设计一个java文本编辑器，能够实现基本的文本文件读取、保存、设置字体等功能。具有菜单、工具栏和状态栏。 实现查找、打印预览。为每个功能添加注释

好的，下面是使用Java语言设计的文本编辑器，可以实现基本的文本文件读取、保存、设置字体等功能，具有菜单、工具栏和状态栏，并实现了查找和打印预览功能。以下是代码及注释：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GraphicsEnvironment;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.filechooser.FileNameExtensionFilter;

public class TextEditor extends JFrame implements ActionListener {

    private JTextArea textArea; //文本区域
    private JTextField findField; //查找输入框
    private JTextField replaceField; //替换输入框
    private JLabel statusLabel; //状态栏标签

    public TextEditor() {
        initComponents();
    }

    //初始化组件
    private void initComponents() {
        //设置窗口标题
        setTitle("文本编辑器");

        //设置窗口图标
        ImageIcon icon = new ImageIcon(getClass().getResource("icon.png"));
        setIconImage(icon.getImage());

        //设置窗口大小
        setSize(600, 400);

        //设置窗口居中显示
        setLocationRelativeTo(null);

        //设置窗口关闭按钮操作
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //创建菜单栏
        JMenuBar menuBar = new JMenuBar();

        //创建文件菜单
        JMenu fileMenu = new JMenu("文件");
        fileMenu.setMnemonic('F');

        //创建新建菜单项
        JMenuItem newMenuItem = new JMenuItem("新建", 'N');
        newMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl N"));
        newMenuItem.addActionListener(this);
        fileMenu.add(newMenuItem);

        //创建打开菜单项
        JMenuItem openMenuItem = new JMenuItem("打开", 'O');
        openMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
        openMenuItem.addActionListener(this);
        fileMenu.add(openMenuItem);

        //创建保存菜单项
        JMenuItem saveMenuItem = new JMenuItem("保存", 'S');
        saveMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
        saveMenuItem.addActionListener(this);
        fileMenu.add(saveMenuItem);

        //创建另存为菜单项
        JMenuItem saveAsMenuItem = new JMenuItem("另存为", 'A');
        saveAsMenuItem.addActionListener(this);
        fileMenu.add(saveAsMenuItem);

        //添加分隔线
        fileMenu.addSeparator();

        //创建退出菜单项
        JMenuItem exitMenuItem = new JMenuItem("退出", 'x');
        exitMenuItem.addActionListener(this);
        fileMenu.add(exitMenuItem);

        //将文件菜单添加到菜单栏
        menuBar.add(fileMenu);

        //创建编辑菜单
        JMenu editMenu = new JMenu("编辑");
        editMenu.setMnemonic('E');

        //创建撤销菜单项
        JMenuItem undoMenuItem = new JMenuItem("撤销", 'U');
        undoMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl Z"));
        undoMenuItem.addActionListener(this);
        editMenu.add(undoMenuItem);

        //创建重做菜单项
        JMenuItem redoMenuItem = new JMenuItem("重做", 'R');
        redoMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl Y"));
        redoMenuItem.addActionListener(this);
        editMenu.add(redoMenuItem);

        //添加分隔线
        editMenu.addSeparator();

        //创建剪切菜单项
        JMenuItem cutMenuItem = new JMenuItem("剪切", 'T');
        cutMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl X"));
        cutMenuItem.addActionListener(this);
        editMenu.add(cutMenuItem);

        //创建复制菜单项
        JMenuItem copyMenuItem = new JMenuItem("复制", 'C');
        copyMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl C"));
        copyMenuItem.addActionListener(this);
        editMenu.add(copyMenuItem);

        //创建粘贴菜单项
        JMenuItem pasteMenuItem = new JMenuItem("粘贴", 'P');
        pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl V"));
        pasteMenuItem.addActionListener(this);
        editMenu.add(pasteMenuItem);

        //添加分隔线
        editMenu.addSeparator();

        //创建查找菜单项
        JMenuItem findMenuItem = new JMenuItem("查找", 'F');
        findMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl F"));
        findMenuItem.addActionListener(this);
        editMenu.add(findMenuItem);

        //创建替换菜单项
        JMenuItem replaceMenuItem = new JMenuItem("替换", 'R');
        replaceMenuItem.setAccelerator(KeyStroke.getKeyStroke("ctrl H"));
        replaceMenuItem.addActionListener(this);
        editMenu.add(replaceMenuItem);

        //将编辑菜单添加到菜单栏
        menuBar.add(editMenu);

        //创建格式菜单
        JMenu formatMenu = new JMenu("格式");
        formatMenu.setMnemonic('O');

        //创建字体菜单项
        JMenuItem fontMenuItem = new JMenuItem("字体", 'F');
        fontMenuItem.addActionListener(this);
        formatMenu.add(fontMenuItem);

        //创建颜色菜单项
        JMenuItem colorMenuItem = new JMenuItem("颜色", 'C');
        colorMenuItem.addActionListener(this);
        formatMenu.add(colorMenuItem);

        //将格式菜单添加到菜单栏
        menuBar.add(formatMenu);

        //创建查看菜单
        JMenu viewMenu = new JMenu("查看");
        viewMenu.setMnemonic('V');

        //创建状态栏菜单项
        JMenuItem statusBarMenuItem = new JMenuItem("状态栏", 'S');
        statusBarMenuItem.addActionListener(this);
        viewMenu.add(statusBarMenuItem);

        //将查看菜单添加到菜单栏
        menuBar.add(viewMenu);

        //创建帮助菜单
        JMenu helpMenu = new JMenu("帮助");
        helpMenu.setMnemonic('H');

        //创建关于菜单项
        JMenuItem aboutMenuItem = new JMenuItem("关于", 'A');
        aboutMenuItem.addActionListener(this);
        helpMenu.add(aboutMenuItem);

        //将帮助菜单添加到菜单栏
        menuBar.add(helpMenu);

        //设置菜单栏
        setJMenuBar(menuBar);

        //创建工具栏
        JPanel toolBar = new JPanel();
        toolBar.setLayout(new BoxLayout(toolBar, BoxLayout.X_AXIS));

        //创建新建工具按钮
        JButton newButton = new JButton(new ImageIcon(getClass().getResource("new.png")));
        newButton.setToolTipText("新建");
        newButton.addActionListener(this);
        toolBar.add(newButton);

        //创建打开工具按钮
        JButton openButton = new JButton(new ImageIcon(getClass().getResource("open.png")));
        openButton.setToolTipText("打开");
        openButton.addActionListener(this);
        toolBar.add(openButton);

        //创建保存工具按钮
        JButton saveButton = new JButton(new ImageIcon(getClass().getResource("save.png")));
        saveButton.setToolTipText("保存");
        saveButton.addActionListener(this);
        toolBar.add(saveButton);

        //添加分隔符
        toolBar.add(Box.createRigidArea(new Dimension(10, 0)));

        //创建剪切工具按钮
        JButton cutButton = new JButton(new ImageIcon(getClass().getResource("cut.png")));
        cutButton.setToolTipText("剪切");
        cutButton.addActionListener(this);
        toolBar.add(cutButton);

        //创建复制工具按钮
        JButton copyButton = new JButton(new ImageIcon(getClass().getResource("copy.png")));
        copyButton.setToolTipText("复制");
        copyButton.addActionListener(this);
        toolBar.add(copyButton);

        //创建粘贴工具按钮
        JButton pasteButton = new JButton(new ImageIcon(getClass().getResource("paste.png")));
        pasteButton.setToolTipText("粘贴");
        pasteButton.addActionListener(this);
        toolBar.add(pasteButton);

        //添加分隔符
        toolBar.add(Box.createRigidArea(new Dimension(10, 0)));

        //创建查找工具按钮
        JButton findButton = new JButton(new ImageIcon(getClass().getResource("find.png")));
        findButton.setToolTipText("查找");
        findButton.addActionListener(this);
        toolBar.add(findButton);

        //创建替换工具按钮
        JButton replaceButton = new JButton(new ImageIcon(getClass().getResource("replace.png")));
        replaceButton.setToolTipText("替换");
        replaceButton.addActionListener(this);
        toolBar.add(replaceButton);

        //设置工具栏
        add(toolBar, BorderLayout.NORTH);

        //创建文本区域
        textArea = new JTextArea();
        textArea.setFont(new Font("宋体", Font.PLAIN, 14));

        //创建滚动面板
        JScrollPane scrollPane = new JScrollPane(textArea);
        add(scrollPane, BorderLayout.CENTER);

        //创建状态栏
        JPanel statusBar = new JPanel();
        statusBar.setLayout(new BoxLayout(statusBar, BoxLayout.X_AXIS));
        statusLabel = new JLabel("字符数: 0   行数: 0");
        statusBar.add(statusLabel);
        add(statusBar, BorderLayout.SOUTH);
    }

    //实现菜单、按钮等组件的动作监听
    @Override
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        switch (command) {
            //新建
            case "新建":
                newFile();
                break;
            //打开
            case "打开":
                openFile();
                break;
            //保存
            case "保存":
                saveFile();
                break;
            //另存为
            case "另存为":
                saveAsFile();
                break;
            //退出
            case "退出":
                System.exit(0);
                break;
            //撤销
            case "撤销":
                if (textArea.canUndo()) {
                    textArea.undo();
                }
                break;
            //重做
            case "重做":
                if (textArea.can