java记事本程序代码

这个Java记事本程序的源码可以通过引用中提供的链接进行下载。该程序主要实现了新建、打开、保存和关闭四个简单的功能，同时也展示了如何使用Java创建界面、安装各种监听器、创建窗口的主菜单、创建JMenuItem并添加到对应的JMenu等操作。如果想要运行该程序，可以在main方法中调用new Notepad()方法。总体来说，这个简单的记事本程序带码具有一定的参考价值，可以帮助新手学习和使用窗口、菜单、IO流等相关知识。

相关问题

java实训记事本程序代码

根据提供的引用内容，我可以为您提供一个简单的Java记事本程序代码，代码如下：

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

public class JavaNotepad extends Frame implements ActionListener {
    TextArea textArea;
    MenuBar menuBar;
    Menu fileMenu, editMenu;
    MenuItem newMenuItem, openMenuItem, saveMenuItem, saveAsMenuItem, exitMenuItem, cutMenuItem, copyMenuItem, pasteMenuItem, findMenuItem, replaceMenuItem;

    public JavaNotepad() {
        setTitle("Java Notepad");
        setSize(500, 500);
        setLocationRelativeTo(null);

        textArea = new TextArea();
        add(textArea);

        menuBar = new MenuBar();
        fileMenu = new Menu("File");
        editMenu = new Menu("Edit");

        newMenuItem = new MenuItem("New");
        openMenuItem = new MenuItem("Open");
        saveMenuItem = new MenuItem("Save");
        saveAsMenuItem = new MenuItem("Save As");
        exitMenuItem = new MenuItem("Exit");
        cutMenuItem = new MenuItem("Cut");
        copyMenuItem = new MenuItem("Copy");
        pasteMenuItem = new MenuItem("Paste");
        findMenuItem = new MenuItem("Find");
        replaceMenuItem = new MenuItem("Replace");

        newMenuItem.addActionListener(this);
        openMenuItem.addActionListener(this);
        saveMenuItem.addActionListener(this);
        saveAsMenuItem.addActionListener(this);
        exitMenuItem.addActionListener(this);
        cutMenuItem.addActionListener(this);
        copyMenuItem.addActionListener(this);
        pasteMenuItem.addActionListener(this);
        findMenuItem.addActionListener(this);
        replaceMenuItem.addActionListener(this);

        fileMenu.add(newMenuItem);
        fileMenu.add(openMenuItem);
        fileMenu.add(saveMenuItem);
        fileMenu.add(saveAsMenuItem);
        fileMenu.addSeparator();
        fileMenu.add(exitMenuItem);

        editMenu.add(cutMenuItem);
        editMenu.add(copyMenuItem);
        editMenu.add(pasteMenuItem);
        editMenu.addSeparator();
        editMenu.add(findMenuItem);
        editMenu.add(replaceMenuItem);

        menuBar.add(fileMenu);
        menuBar.add(editMenu);

        setMenuBar(menuBar);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                dispose();
            }
        });    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == newMenuItem) {
            textArea.setText("");
        } else if (e.getSource() == openMenuItem) {
            FileDialog fileDialog = new FileDialog(this, "Open File", FileDialog.LOAD);
            fileDialog.setVisible(true);

            if (fileDialog.getFile() != null) {
                String fileName = fileDialog.getDirectory() + fileDialog.getFile();
                setTitle(fileName);
                readFile(fileName);
            }
        } else if (e.getSource() == saveMenuItem) {
            String fileName = getTitle();

            if (fileName.equals("Java Notepad")) {
                FileDialog fileDialog = new FileDialog(this, "Save File", FileDialog.SAVE);
                fileDialog.setVisible(true);

                if (fileDialog.getFile() != null) {
                    fileName = fileDialog.getDirectory() + fileDialog.getFile();
                    setTitle(fileName);
                    writeFile(fileName);
                }
            } else {
                writeFile(fileName);
            }
        } else if (e.getSource() == saveAsMenuItem) {
            FileDialog fileDialog = new FileDialog(this, "Save File As", FileDialog.SAVE);
            fileDialog.setVisible(true);

            if (fileDialog.getFile() != null) {
                String fileName = fileDialog.getDirectory() + fileDialog.getFile();
                setTitle(fileName);
                writeFile(fileName);
            }
        } else if (e.getSource() == exitMenuItem) {
            dispose();
        } else if (e.getSource() == cutMenuItem) {
            textArea.cut();
        } else if (e.getSource() == copyMenuItem) {
            textArea.copy();
        } else if (e.getSource() == pasteMenuItem) {
            textArea.paste();
        } else if (e.getSource() == findMenuItem) {
            String findString = JOptionPane.showInputDialog(this, "Find:");
            String text = textArea.getText();
            int index = text.indexOf(findString);

            if (index != -1) {
                textArea.select(index, index + findString.length());
            }
        } else if (e.getSource() == replaceMenuItem) {
            String findString = JOptionPane.showInputDialog(this, "Find:");
            String replaceString = JOptionPane.showInputDialog(this, "Replace:");
            String text = textArea.getText();
            int index = text.indexOf(findString);

            if (index != -1) {
                textArea.replaceRange(replaceString, index, index + findString.length());
            }
        }
    }

    private void readFile(String fileName) {
        try {
            BufferedReader reader = new BufferedReader(new FileReader(fileName));
            String line = null;

            while ((line = reader.readLine()) != null) {
                textArea.append(line + "\n");
            }

            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void writeFile(String fileName) {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
            writer.write(textArea.getText());
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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

这个记事本程序可以实现编辑、保存、另存为、查找和替换等功能。您可以根据需要进行修改和扩展。

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