java记事本代码 爱心

以下是一个简单的Java记事本代码，其中包含一个爱心图案：

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

public class Notepad extends JFrame implements ActionListener {
    private JTextArea textArea = new JTextArea("", 0,0);
    private JScrollPane scrollPane = new JScrollPane(textArea);
    private JFileChooser fileChooser = new JFileChooser();
    private String currentFile = "Untitled";
    
    public Notepad() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(500, 500);
        setTitle(currentFile + " - Java Notepad");
        setLocationRelativeTo(null);
        
        textArea.setFont(new Font("Monospaced", Font.PLAIN, 12));
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        
        JMenu fileMenu = new JMenu("File");
        menuBar.add(fileMenu);
        
        JMenuItem newMenuItem = new JMenuItem("New");
        newMenuItem.addActionListener(this);
        fileMenu.add(newMenuItem);
        
        JMenuItem openMenuItem = new JMenuItem("Open");
        openMenuItem.addActionListener(this);
        fileMenu.add(openMenuItem);
        
        JMenuItem saveMenuItem = new JMenuItem("Save");
        saveMenuItem.addActionListener(this);
        fileMenu.add(saveMenuItem);
        
        JMenuItem exitMenuItem = new JMenuItem("Exit");
        exitMenuItem.addActionListener(this);
        fileMenu.add(exitMenuItem);
        
        JMenu editMenu = new JMenu("Edit");
        menuBar.add(editMenu);
        
        JMenuItem cutMenuItem = new JMenuItem("Cut");
        cutMenuItem.addActionListener(this);
        editMenu.add(cutMenuItem);
        
        JMenuItem copyMenuItem = new JMenuItem("Copy");
        copyMenuItem.addActionListener(this);
        editMenu.add(copyMenuItem);
        
        JMenuItem pasteMenuItem = new JMenuItem("Paste");
        pasteMenuItem.addActionListener(this);
        editMenu.add(pasteMenuItem);
        
        JMenu helpMenu = new JMenu("Help");
        menuBar.add(helpMenu);
        
        JMenuItem aboutMenuItem = new JMenuItem("About");
        aboutMenuItem.addActionListener(this);
        helpMenu.add(aboutMenuItem);
        
        setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e) {
        String action = e.getActionCommand();
        
        if (action.equals("New")) {
            new Notepad();
        } else if (action.equals("Open")) {
            if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
                openFile(fileChooser.getSelectedFile().getAbsolutePath());
            }
        } else if (action.equals("Save")) {
            if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
                saveFile(fileChooser.getSelectedFile().getAbsolutePath());
            }
        } else if (action.equals("Exit")) {
            dispose();
        } else if (action.equals("Cut")) {
            textArea.cut();
        } else if (action.equals("Copy")) {
            textArea.copy();
        } else if (action.equals("Paste")) {
            textArea.paste();
        } else if (action.equals("About")) {
            JOptionPane.showMessageDialog(this, "Java Notepad\n\nA simple notepad application written in Java.", "About Java Notepad", JOptionPane.INFORMATION_MESSAGE);
        }
    }
    
    private void openFile(String fileName) {
        try {
            textArea.setText("");
            java.io.FileReader in = new java.io.FileReader(fileName);
            int c;
            while ((c = in.read()) != -1) {
                textArea.append(String.valueOf((char)c));
            }
            in.close();
            currentFile = fileName;
            setTitle(currentFile + " - Java Notepad");
        } catch (java.io.IOException e) {
            JOptionPane.showMessageDialog(this, "Error opening file:\n" + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }
    }
    
    private void saveFile(String fileName) {
        try {
            java.io.FileWriter out = new java.io.FileWriter(fileName);
            out.write(textArea.getText());
            out.close();
            currentFile = fileName;
            setTitle(currentFile + " - Java Notepad");
        } catch (java.io.IOException e) {
            JOptionPane.showMessageDialog(this, "Error saving file:\n" + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }
    }
    
    public static void main(String[] args) {
        new Notepad();
    }
    
    // 爱心图案
    private static final String HEART = 
        "     * * * * * * * * *\n" +
        "   * * * * * * * * * * *\n" +
        " * * * * * * * * * * * * *\n" +
        "* * * * * * * * * * * * * *\n" +
        "* * * * * * * * * * * * * *\n" +
        "* * * * * * * * @* * * * *\n" +
        "* * * * * *@*   @*  * *\n" +
        "*  *  *@*   @@*  **\n" +
        "  **   @@*  @@@*\n" +
        "    **  @@@@@*\n" +
        "      **@*\n";
}