仿照windows记事本，制作一个记事本软件，实现纯文本文件的新建、打开、保存、另存、复制、粘贴、查找、替换、关于等等功能；关闭软件是弹出对话框提示是否把修改保存，根据用户选择更新磁盘文件内容。用java实现

好的，我可以为您提供一些思路和代码示例。

首先，我们需要创建一个主界面窗口。以下是一个简单的示例代码：

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
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.BorderFactory;
import javax.swing.JButton;
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.SwingConstants;
import javax.swing.border.Border;
import javax.swing.filechooser.FileNameExtensionFilter;

public class MyNotepad extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JTextArea textArea;
    private JLabel statusLabel;
    private JFileChooser fileChooser;
    private File currentFile;
    private boolean isModified;
    private JTextField searchField, replaceField;
    private JButton searchButton, replaceButton, replaceAllButton;

    public MyNotepad() {
        super("Java记事本");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(800, 500);
        setLocationRelativeTo(null);

        // 创建菜单栏
        JMenuBar menuBar = new JMenuBar();
        // 创建文件菜单
        JMenu fileMenu = new JMenu("文件");
        fileMenu.setMnemonic('F');
        JMenuItem newItem = new JMenuItem("新建", 'N');
        newItem.setAccelerator(KeyStroke.getKeyStroke("ctrl N"));
        newItem.addActionListener(this);
        fileMenu.add(newItem);
        JMenuItem openItem = new JMenuItem("打开", 'O');
        openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
        openItem.addActionListener(this);
        fileMenu.add(openItem);
        JMenuItem saveItem = new JMenuItem("保存", 'S');
        saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
        saveItem.addActionListener(this);
        fileMenu.add(saveItem);
        JMenuItem saveAsItem = new JMenuItem("另存为", 'A');
        saveAsItem.addActionListener(this);
        fileMenu.add(saveAsItem);
        fileMenu.addSeparator();
        JMenuItem exitItem = new JMenuItem("退出", 'X');
        exitItem.addActionListener(this);
        fileMenu.add(exitItem);
        menuBar.add(fileMenu);

        // 创建编辑菜单
        JMenu editMenu = new JMenu("编辑");
        editMenu.setMnemonic('E');
        JMenuItem copyItem = new JMenuItem("复制", 'C');
        copyItem.setAccelerator(KeyStroke.getKeyStroke("ctrl C"));
        copyItem.addActionListener(this);
        editMenu.add(copyItem);
        JMenuItem pasteItem = new JMenuItem("粘贴", 'P');
        pasteItem.setAccelerator(KeyStroke.getKeyStroke("ctrl V"));
        pasteItem.addActionListener(this);
        editMenu.add(pasteItem);
        JMenuItem findItem = new JMenuItem("查找", 'F');
        findItem.setAccelerator(KeyStroke.getKeyStroke("ctrl F"));
        findItem.addActionListener(this);
        editMenu.add(findItem);
        JMenuItem replaceItem = new JMenuItem("替换", 'R');
        replaceItem.setAccelerator(KeyStroke.getKeyStroke("ctrl H"));
        replaceItem.addActionListener(this);
        editMenu.add(replaceItem);
        menuBar.add(editMenu);

        // 创建帮助菜单
        JMenu helpMenu = new JMenu("帮助");
        JMenuItem aboutItem = new JMenuItem("关于", 'A');
        aboutItem.addActionListener(this);
        helpMenu.add(aboutItem);
        menuBar.add(helpMenu);

        setJMenuBar(menuBar);

        // 创建工具栏
        JPanel toolBar = new JPanel(new FlowLayout(FlowLayout.LEFT));
        JButton newButton = new JButton("新建");
        newButton.addActionListener(this);
        toolBar.add(newButton);
        JButton openButton = new JButton("打开");
        openButton.addActionListener(this);
        toolBar.add(openButton);
        JButton saveButton = new JButton("保存");
        saveButton.addActionListener(this);
        toolBar.add(saveButton);
        JButton copyButton = new JButton("复制");
        copyButton.addActionListener(this);
        toolBar.add(copyButton);
        JButton pasteButton = new JButton("粘贴");
        pasteButton.addActionListener(this);
        toolBar.add(pasteButton);
        JButton findButton = new JButton("查找");
        findButton.addActionListener(this);
        toolBar.add(findButton);
        JButton replaceButton = new JButton("替换");
        replaceButton.addActionListener(this);
        toolBar.add(replaceButton);

        // 创建状态栏
        statusLabel = new JLabel("就绪");
        statusLabel.setPreferredSize(new Dimension(getWidth(), 20));
        statusLabel.setHorizontalAlignment(SwingConstants.LEFT);
        statusLabel.setBorder(BorderFactory.createLoweredBevelBorder());

        // 创建文本域
        textArea = new JTextArea();
        textArea.setFont(new Font("宋体", Font.PLAIN, 16));
        JScrollPane scrollPane = new JScrollPane(textArea);

        // 创建查找替换面板
        JPanel searchPanel = new JPanel(new GridLayout(1, 5));
        Border border = BorderFactory.createEtchedBorder();
        searchPanel.setBorder(BorderFactory.createTitledBorder(border, "查找/替换"));
        JLabel searchLabel = new JLabel("查找：");
        searchField = new JTextField();
        searchPanel.add(searchLabel);
        searchPanel.add(searchField);
        searchButton = new JButton("查找下一个");
        searchButton.addActionListener(this);
        searchPanel.add(searchButton);
        JLabel replaceLabel = new JLabel("替换为：");
        replaceField = new JTextField();
        searchPanel.add(replaceLabel);
        replaceButton = new JButton("替换");
        replaceButton.addActionListener(this);
        searchPanel.add(replaceButton);
        replaceAllButton = new JButton("全部替换");
        replaceAllButton.addActionListener(this);
        searchPanel.add(replaceAllButton);

        // 添加组件到容器中
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(toolBar, BorderLayout.NORTH);
        contentPane.add(scrollPane, BorderLayout.CENTER);
        contentPane.add(statusLabel, BorderLayout.SOUTH);
        contentPane.add(searchPanel, BorderLayout.EAST);

        // 初始化状态
        isModified = false;
        setTitle("未命名" + " - Java记事本");

        // 创建文件选择器
        fileChooser = new JFileChooser();
        fileChooser.setFileFilter(new FileNameExtensionFilter("文本文件 (*.txt)", "txt"));

        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        switch (command) {
        case "新建":
            doNew();
            break;
        case "打开":
            doOpen();
            break;
        case "保存":
            doSave();
            break;
        case "另存为":
            doSaveAs();
            break;
        case "退出":
            doExit();
            break;
        case "复制":
            doCopy();
            break;
        case "粘贴":
            doPaste();
            break;
        case "查找":
            doFind();
            break;
        case "替换":
            doReplace();
            break;
        case "查找下一个":
            doFindNext();
            break;
        case "替换":
            doReplace();
            break;
        case "全部替换":
            doReplaceAll();
            break;
        case "关于":
            doAbout();
            break;
        }
    }

    // 新建文件
    private void doNew() {
        if (isModified) {
            int result = JOptionPane.showConfirmDialog(this, "是否保存更改？", "保存", JOptionPane.YES_NO_CANCEL_OPTION);
            if (result == JOptionPane.YES_OPTION) {
                doSave();
            } else if (result == JOptionPane.CANCEL_OPTION) {
                return;
            }
        }
        currentFile = null;
        textArea.setText("");
        setTitle("未命名" + " - Java记事本");
        isModified = false;
    }

    // 打开文件
    private void doOpen() {
        if (isModified) {
            int result = JOptionPane.showConfirmDialog(this, "是否保存更改？", "保存", JOptionPane.YES_NO_CANCEL_OPTION);
            if (result == JOptionPane.YES_OPTION) {
                doSave();
            } else if (result == JOptionPane.CANCEL_OPTION) {
                return;
            }
        }
        int result = fileChooser.showOpenDialog(this);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                    sb.append(System.lineSeparator());
                }
                textArea.setText(sb.toString());
                currentFile = file;
                setTitle(currentFile.getName() + " - Java记事本");
                isModified = false;
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    // 保存文件
    private void doSave() {
        if (currentFile == null) {
            doSaveAs();
        } else {
            try (BufferedWriter writer = new BufferedWriter(new FileWriter(currentFile))) {
                writer.write(textArea.getText());
                setTitle(currentFile.getName() + " - Java记事本");
                isModified = false;
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    // 另存为文件
    private void doSaveAs() {
        int result = fileChooser.showSaveDialog(this);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            if (!file.getName().endsWith(".txt")) {
                file = new File(file.getAbsolutePath() + ".txt");
            }
            try (BufferedWriter writer = new BufferedWriter(new FileWriter(file))) {
                writer.write(textArea.getText());
                currentFile = file;
                setTitle(currentFile.getName() + " - Java记事本");
                isModified = false;
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    // 退出程序
    private void doExit() {
        if (isModified) {
            int result = JOptionPane.showConfirmDialog(this, "是否保存更改？", "保存", JOptionPane.YES_NO_CANCEL_OPTION);
            if (result == JOptionPane.YES_OPTION) {
                doSave();
            } else if (result == JOptionPane.CANCEL_OPTION) {
                return;
            }
        }
        System.exit(0);
    }

    // 复制
    private void doCopy() {
        textArea.copy();
    }

    // 粘贴
    private void doPaste() {
        textArea.paste();
    }

    // 查找
    private void doFind() {
        searchField.requestFocus();
    }

    // 替换
    private void doReplace() {
        replaceField.requestFocus();
    }

    // 查找下一个
    private void doFindNext() {
        String searchText = searchField.getText();
        String text = textArea.getText();
        int index = text.indexOf(searchText, textArea.getCaretPosition());
        if (index >= 0) {
            textArea.select(index, index + searchText.length());
        } else {
            JOptionPane.showMessageDialog(this, "找不到\"" + searchText + "\"", "查找", JOptionPane.INFORMATION_MESSAGE);
        }
    }

    // 替换
    private void doReplaceAll() {
        String searchText = searchField.getText();
        String replaceText = replaceField.getText();
        String text = textArea.getText();
        text = text.replaceAll(searchText, replaceText);
        textArea.setText(text);
    }

    // 关于
    private void doAbout() {
        JOptionPane.showMessageDialog(this, "Java记事本 v1.0\n作者：xxx", "关于", JOptionPane.INFORMATION_MESSAGE);
    }

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

在这个示例中，我们实现了新建、打开、保存、另存、复制、粘贴、查找、替换、关于等功能，并且在关闭软件时弹出对话框提示是否保存修改。同时，我们还添加了工具栏和状态栏，方便用户操作和查看文件状态。

需要注意的是，我们使用了文件选择器来让用户选择文件，同时限定了文件类型为纯文本文件。在保存文件时，如果用户没有指定文件名或者选择的文件名不符合要求，我们会自动添加".txt"后缀以保证文件类型正确。

在查找和替换功能中，我们使用了Java的字符串查找和替换方法，这些方法都非常方便实用。同时，我们也可以使用正则表达式来进行更加灵活的匹配和替换。

希望这个示例能够帮助您完成记事本软件的制作。