diff --git a/src/java2020spring/About.java b/src/java2020spring/About.java
new file mode 100644
index 0000000000000000000000000000000000000000..65a030580c5a7ae069bdf1bf938411d80fda970c
--- /dev/null
+++ b/src/java2020spring/About.java
@@ -0,0 +1,26 @@
+package java2020spring; 
+
+import java.awt.Font;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.ItemEvent;
+import java.awt.event.ItemListener;
+
+import javax.swing.*;
+
+public class About extends JDialog{
+	JLabel text; 
+About(JFrame f){
+	super(f);
+	setTitle("关于“记事本”");
+    text=new JLabel("版本：1.0 " + "制作者：202025710108信管一班黄紫铃");
+    add(text);
+	setBounds(100,100,350,170);
+	setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+	validate();
+	
+}
+
+	
+
+}
diff --git a/src/java2020spring/FontDialog.java b/src/java2020spring/FontDialog.java
new file mode 100644
index 0000000000000000000000000000000000000000..d412cbdbd77aaba6224301111c499348b60281bc
--- /dev/null
+++ b/src/java2020spring/FontDialog.java
@@ -0,0 +1,87 @@
+package java2020spring;
+
+import java.awt.*;
+
+import java.awt.event.*;
+
+import javax.swing.*;
+
+public class FontDialog extends JDialog implements ItemListener,ActionListener{
+	FontFamilyNames fontFamilyNames; 
+	int fontSize=38;
+	String fontName;
+	JComboBox fontNameList,fontSizeList;
+	JLabel label;
+	Font font;
+	JButton yes,cancel;
+	static int YES=1,NO=0;
+	int state=-1;
+	FontDialog(JFrame f){
+		super(f);//?
+		setTitle("字体设置");
+		font =new Font("宋体",Font.PLAIN,12);
+		fontFamilyNames=new FontFamilyNames();
+		setModal(true);
+		yes=new JButton("Yes");
+		cancel=new JButton("cancel");
+		yes.addActionListener(this);
+		cancel.addActionListener(this);
+		label=new JLabel("AaBbYyZz",JLabel.CENTER);
+		fontNameList=new JComboBox();
+		fontSizeList=new JComboBox();
+		String name[]=fontFamilyNames.getFontName();
+		fontNameList.addItem("字体");
+		for(int k=0;k<name.length;k++)
+			fontNameList.addItem(name[k]);
+		fontSizeList.addItem("大小");
+		for(int k=8;k<72;k=k+2)
+			fontSizeList.addItem(new Integer(k));
+		fontNameList.addItemListener(this);
+		fontSizeList.addActionListener(this);
+		JPanel pNorth=new JPanel();
+		pNorth.add(fontNameList);
+		pNorth.add(fontSizeList);
+		add(pNorth,BorderLayout.NORTH);
+		add(label,BorderLayout.CENTER);
+		JPanel pSouth=new JPanel();
+		pSouth.add(yes);
+		pSouth.add(cancel);
+		add(pSouth,BorderLayout.SOUTH);
+		setBounds(100,100,350,170);
+		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+		validate();
+	}
+	public void itemStateChanged(ItemEvent e) {
+		if(e.getSource()==fontNameList) {
+			fontName=(String)fontNameList.getSelectedItem();
+			font=new Font(fontName,Font.PLAIN,fontSize);
+		}
+		else if(e.getSource()==fontSizeList) {
+			Integer m=(Integer)fontSizeList.getSelectedItem();
+			fontSize=m.intValue();
+			font=new Font(fontName,Font.PLAIN,fontSize);
+			
+		}
+		label.setFont(font);
+		label.repaint();
+		validate();
+	}
+	public void actionPerformed(ActionEvent e) {
+		if(e.getSource()==yes) {
+			state=YES;
+			setVisible(false);//
+			
+	}
+		else if(e.getSource()==cancel) {
+			state=NO;
+			setVisible(false);//
+		}
+		
+	}
+public int getState() {
+	return state;
+}
+public Font getFont() {
+	return font;
+}
+}
diff --git a/src/java2020spring/FontFamilyNames.java b/src/java2020spring/FontFamilyNames.java
new file mode 100644
index 0000000000000000000000000000000000000000..15df80b37661d771dd0e7e77b395bd08e6fc0e75
--- /dev/null
+++ b/src/java2020spring/FontFamilyNames.java
@@ -0,0 +1,12 @@
+package java2020spring; 
+import java.awt.GraphicsEnvironment;
+
+public class FontFamilyNames {
+String allFontNames[];
+public String[]getFontName(){
+	GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
+	allFontNames=ge.getAvailableFontFamilyNames();
+	return allFontNames;
+	
+}
+}
diff --git a/src/java2020spring/Test.java b/src/java2020spring/MainClass.java
similarity index 34%
rename from src/java2020spring/Test.java
rename to src/java2020spring/MainClass.java
index fc09c195f566d0e707f5e8a2f05fd168069c73a7..320379898251a4c247cf0d144e36a5b7d36c303d 100644
--- a/src/java2020spring/Test.java
+++ b/src/java2020spring/MainClass.java
@@ -1,9 +1,12 @@
 package java2020spring;
 
-public class Test {
 
+public class MainClass {
+ 
 	public static void main(String[] args) {
-		System.out.println("Hello world!");
+		WindowMenu win=new WindowMenu();
+		win.setBounds(100,100,590,500);
+		win.setTitle("无标题-记事本");
 
 	}
 
diff --git a/src/java2020spring/WindowMenu.java b/src/java2020spring/WindowMenu.java
new file mode 100644
index 0000000000000000000000000000000000000000..abe92ad931d58afa88c36a41a6f1a40166d87287
--- /dev/null
+++ b/src/java2020spring/WindowMenu.java
@@ -0,0 +1,488 @@
+package java2020spring;
+
+
+
+	import java.awt.BorderLayout;
+
+
+
+import java.awt.FileDialog;
+import java.awt.FlowLayout;
+import java.awt.datatransfer.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.InputEvent;
+	import java.awt.event.KeyEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.io.*;
+import java.net.URI;
+
+import javax.swing.*;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+import javax.swing.event.UndoableEditEvent;
+import javax.swing.event.UndoableEditListener;
+import javax.swing.undo.*;
+
+
+
+	public class WindowMenu extends JFrame implements ActionListener,DocumentListener{
+	File file;
+	FileDialog fileDlg;
+	String str,fileName;
+	int p;
+	JMenuBar  menubar;
+	JMenu menu1,menu2,menu3,menu4,menu5;
+	JMenuItem item1,item2,item3,item4,item5,
+	item2_1,item2_2,item2_3,item2_4,item2_5,item2_10,item2_11,item2_12,
+	item3_1, item3_2, item4_1, item5_1, item5_2;
+
+	Toolkit toolkit = Toolkit.getDefaultToolkit();
+	Clipboard clipBoard = toolkit.getSystemClipboard();
+	// 创建撤销操作管理器
+	protected UndoManager undo = new UndoManager();
+	protected UndoableEditListener undoHandler = new UndoHandler();
+	// 其他变量
+	    
+	JTextArea showText;
+	JMenu menu;
+	JPopupMenu jpm;
+	JButton buttonFont;
+	JLabel statusline;
+	String oldValue;// 存放编辑区原来的内容，用于比较文本是否有改动
+	boolean isNewFile = true;// 是否新文件(未保存过的)
+	File currentFile;// 当前文件名
+
+    WindowMenu(){
+    	init();
+	setLayout(new FlowLayout());
+	setVisible(true);
+	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+}
+	
+	void init() {
+		showText=new JTextArea(23,63);
+		oldValue=showText.getText();
+		//创建菜单条
+		menubar=new JMenuBar();
+		//创建菜单
+		menu1=new JMenu("文件(F)");
+		menu2=new JMenu("编辑(E)");
+		menu3=new JMenu("格式(O)");
+		menu4=new JMenu("查看(V)");
+		menu5=new JMenu("帮助(H)");
+		
+		item1=new JMenuItem("新建(N)");
+		item2=new JMenuItem("打开(O)...");
+		item3=new JMenuItem("保存(S)");
+		item4=new JMenuItem("另存为(A)...");
+		item5=new JMenuItem("退出(X)");
+        //menu1的菜单项
+		
+		item2_1=new JMenuItem("撤消(U)");
+		item2_1.setEnabled(false); 
+		item2_2=new JMenuItem("剪切(T)");
+		item2_3=new JMenuItem("复制(C)");
+		item2_4=new JMenuItem("粘贴(P)");
+		item2_5=new JMenuItem("删除(L)");
+		item2_10=new JMenuItem("全选(A)...");
+		item2_11=new JMenuItem("时间/日期(D)...");
+		//menu2的菜单项
+		
+		item3_1=new JMenuItem("自动换行(W)           ");
+		item3_2=new JMenuItem("字体(F)...            ");
+		//menu3的菜单项
+		
+		item4_1=new JMenuItem("状态栏(S)             ");
+		//点击可使上方状态栏消失
+		//menu4的菜单项
+		
+		item5_1=new JMenuItem("查看帮助(H)           ");
+		item5_2=new JMenuItem("关于记事本(A)         ");
+		//menu5的菜单项
+		
+		
+		item1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK));
+		item2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));
+		item3.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
+        //设置menu1的快捷键
+		item2_1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,InputEvent.CTRL_MASK));
+		item2_2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
+		item2_3.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
+		item2_4.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
+		item2_5.setAccelerator(KeyStroke.getKeyStroke("Delete"));
+		item2_10.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));
+		item2_11.setAccelerator(KeyStroke.getKeyStroke("F5"));
+		//设置menu2的快捷键
+		
+
+		menu1.add(item1);
+		menu1.add(item2);
+		menu1.add(item3);
+		menu1.add(item4);
+		menu1.addSeparator();
+		//增加分隔条
+		menu1.add(item5);
+		//添加menu1的菜单项
+		menu2.add(item2_1);
+		menu2.addSeparator();
+		menu2.add(item2_2);
+		menu2.add(item2_3);
+		menu2.add(item2_4);
+		menu2.add(item2_5);
+		menu2.addSeparator();
+		menu2.add(item2_10);
+		menu2.add(item2_11);
+		//添加menu2的菜单项
+		menu3.add(item3_1);
+		menu3.add(item3_2);
+		//添加menu3的菜单项
+		menu4.add(item4_1);
+		//添加menu4的菜单项
+		menu5.add(item5_1);
+		menu5.addSeparator();
+		menu5.add(item5_2);
+		menubar.add(menu1);
+		menubar.add(menu2);
+		menubar.add(menu3);
+		menubar.add(menu4);
+		menubar.add(menu5);
+		
+		jpm=menu2.getPopupMenu();
+		
+		
+		setJMenuBar(menubar);
+		//将菜单条放置到窗口中
+		
+		statusline=new JLabel("状态栏");
+		this.add(statusline,BorderLayout.NORTH);
+		statusline.setVisible(true);
+		
+		item1.addActionListener(this);
+		//向新建键注册监视器
+		item2.addActionListener(this);
+		item3.addActionListener(this);
+		item4.addActionListener(this);
+		item5.addActionListener(this);
+		//向退出键注册监视器
+		item2_1.addActionListener(this);
+		item2_2.addActionListener(this);
+		item2_3.addActionListener(this);
+		item2_4.addActionListener(this);
+		item2_5.addActionListener(this);
+		item2_10.addActionListener(this);
+		item2_11.addActionListener(this);
+		item3_1.addActionListener(this);
+		item3_2.addActionListener(this);
+		item4_1.addActionListener(this);
+		item5_1.addActionListener(this);
+		item5_2.addActionListener(this);
+
+		add(new JScrollPane(showText));
+		//JTextArea不自带滚动窗格
+	    //因此需要把文本区放到一个滚动窗格中
+	    //滚动窗格只可以添加一个组件
+			
+		// 编辑区注册事件监听
+		showText.getDocument().addUndoableEditListener(undoHandler);
+		showText.getDocument().addDocumentListener(this);
+
+		// 右键弹出式菜单
+		showText.addMouseListener(new MouseAdapter() {
+			public void mouseReleased(MouseEvent e) {
+				if (e.getButton() == MouseEvent.BUTTON3)
+					jpm.show(menu2, e.getX() - 30, e.getY());
+			}
+
+			public void mouseClicked(MouseEvent e) {
+				if (e.getButton() == MouseEvent.BUTTON1)
+					jpm.setVisible(false);
+			}
+		});
+	}
+	
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		if (e.getSource() == item5) {
+			System.exit(0);
+
+		}// //实现按下退出键即退出的功能
+		
+		if(e.getSource()==item1)//新建
+			showText.setText("");
+		
+		if (e.getSource() == item2)// 打开
+		{
+		showText.requestFocus();
+		String currentValue = showText.getText();
+		boolean isTextChange = (currentValue.equals(oldValue)) ? false : true;
+		if (isTextChange) {
+			int saveChoose = JOptionPane.showConfirmDialog(this, "您的文件尚未保存，是否保存？", "提示",
+					JOptionPane.YES_NO_CANCEL_OPTION);
+			if (saveChoose == JOptionPane.YES_OPTION) {
+				String str = null;
+				JFileChooser fileChooser = new JFileChooser();
+				fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
+				// fileChooser.setApproveButtonText("确定");
+				fileChooser.setDialogTitle("另存为");
+				int result = fileChooser.showSaveDialog(this);
+				if (result == JFileChooser.CANCEL_OPTION) {
+					statusline.setText("您没有选择任何文件");
+					return;
+				}
+		File saveFileName = fileChooser.getSelectedFile();
+		if (saveFileName == null || saveFileName.getName().equals("")) {
+			JOptionPane.showMessageDialog(this, "不合法的文件名", "不合法的文件名", JOptionPane.ERROR_MESSAGE);
+		} else {
+			try {
+				Writer fw = new FileWriter(saveFileName);//change
+				BufferedWriter bfw = new BufferedWriter(fw);
+				bfw.write(showText.getText(), 0, showText.getText().length());
+				bfw.flush();// 刷新该流的缓冲
+				bfw.close();
+				isNewFile = false;
+				currentFile = saveFileName;
+				oldValue = showText.getText();
+				this.setTitle(saveFileName.getName() + " - 记事本");
+				statusline.setText("当前打开文件：" + saveFileName.getAbsoluteFile());
+			} catch (IOException ioException) {
+			}
+		}
+	    } 
+			else if (saveChoose == JOptionPane.NO_OPTION)
+			{
+		String str = null;
+		JFileChooser fileChooser = new JFileChooser();
+		fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
+		// fileChooser.setApproveButtonText("确定");
+		fileChooser.setDialogTitle("打开文件");
+		int result = fileChooser.showOpenDialog(this);
+		if (result == JFileChooser.CANCEL_OPTION) {
+			statusline.setText("您没有选择任何文件");
+			return;
+		}
+		File fileName = fileChooser.getSelectedFile();
+		if (fileName == null || fileName.getName().equals("")) {
+			JOptionPane.showMessageDialog(this, "不合法的文件名", "不合法的文件名", JOptionPane.ERROR_MESSAGE);
+		} else {
+			try {
+				Reader fr = new FileReader(fileName);
+				BufferedReader bfr = new BufferedReader(fr);
+				showText.setText("");
+				while ((str = bfr.readLine()) != null) {
+					showText.append(str);
+				}
+				this.setTitle(fileName.getName() + " - 记事本");
+				statusline.setText(" 当前打开文件：" + fileName.getAbsoluteFile());
+				fr.close();
+				isNewFile = false;
+				currentFile = fileName;
+				oldValue = showText.getText();
+			} catch (IOException ioException) {
+			}
+					}
+				} else {
+					return;
+				}
+			} else {
+				String str = null;
+				JFileChooser fileChooser = new JFileChooser();
+				fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
+				// fileChooser.setApproveButtonText("确定");
+				fileChooser.setDialogTitle("打开文件");
+				int result = fileChooser.showOpenDialog(this);
+				if (result == JFileChooser.CANCEL_OPTION) {
+					statusline.setText(" 您没有选择任何文件 ");
+					return;
+				}
+				File fileName = fileChooser.getSelectedFile();
+				if (fileName == null || fileName.getName().equals("")) {
+					JOptionPane.showMessageDialog(this, "不合法的文件名", "不合法的文件名", JOptionPane.ERROR_MESSAGE);
+				} else {
+					try {
+						Reader fr = new FileReader(fileName);//change
+						BufferedReader bfr = new BufferedReader(fr);
+						showText.setText("");
+						while ((str = bfr.readLine()) != null) {
+							showText.append(str);
+						}
+						this.setTitle(fileName.getName() + " - 记事本");
+						statusline.setText(" 当前打开文件：" + fileName.getAbsoluteFile());
+						fr.close();
+						isNewFile = false;
+						currentFile = fileName;
+						oldValue = showText.getText();
+					} catch (IOException ioException) {
+					}
+				}
+			}
+//问题：打开不了含有中文字符的文件
+			
+		}
+		if (e.getSource() == item3)// 保存
+
+		{
+			fileDlg = new FileDialog(this, "保存", FileDialog.SAVE);
+			this.setVisible(true);
+
+			if (file == null) {
+				fileDlg.setVisible(true);
+				String dirPath = fileDlg.getDirectory();
+				String fileName = fileDlg.getFile();
+				if (dirPath == null || fileName == null)
+					return;
+				file = new File(dirPath, fileName);
+				try {
+					BufferedWriter bfwt = new BufferedWriter(new FileWriter(file));
+					String t = showText.getText();
+					bfwt.write(t);
+					bfwt.close();
+					showText.setText("");
+				} catch (IOException ex) {
+					throw new RuntimeException();
+				}
+			}
+		}
+
+		if (e.getSource() == item4)// 另存为
+		{
+			JFileChooser chooser = new JFileChooser();
+			// 创建文件选择器
+			int result = chooser.showSaveDialog(null);
+			// 弹出一个save file文件选择器对话框
+			if (result == JFileChooser.APPROVE_OPTION) {
+				// JFileChooser.APPROVE_OPTION是个整数常量，代表0
+				try {
+					// 向磁盘中写文件
+					FileWriter fout = new FileWriter(chooser.getSelectedFile(), true);
+					// 创建文件输出流对象
+					// 写数据
+					String string = showText.getText();
+					fout.write(showText.getText() + "\r\n");
+					fout.close();// 关闭流，释放IO流所占的系统资源
+				} catch (IOException e1) {
+					// TODO Auto-generated catch block
+					e1.printStackTrace();
+				}
+			}
+		} 
+	
+	
+		if (e.getSource() == item2_1)// 撤销
+		{
+			showText.requestFocus();
+			if (undo.canUndo()) {
+				try {
+					undo.undo();
+				} catch (CannotUndoException ex) {
+					System.out.println("Unable to undo:" + ex);
+					// ex.printStackTrace();
+				}
+			}
+			if (!undo.canUndo()) {
+				item2_1.setEnabled(false);
+			}
+		}
+	
+	if(e.getSource()==item2_3) {//复制
+		str=showText.getSelectedText();
+	}
+	if(e.getSource()==item2_2)//剪切
+	{
+		str=showText.getSelectedText();
+		showText.replaceRange
+		("", showText.getSelectionStart(), showText.getSelectionEnd());
+	}
+
+	if(e.getSource()==item2_4)//粘贴
+	{
+	p=showText.getCaretPosition();	
+	showText.replaceRange
+	("", showText.getSelectionStart(), showText.getSelectionEnd());
+	showText.insert(str, p);
+	}
+
+	if(e.getSource()==item2_5)//删除
+	{
+		showText.replaceRange
+		("", showText.getSelectionStart(), showText.getSelectionEnd());
+	}
+	if(e.getSource()==item2_10)//全选
+	{
+		showText.selectAll();
+	}
+	if(e.getSource()==item2_11)//时间/日期
+	{
+		java.text.SimpleDateFormat formatter=new java.text.SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
+		java.util.Date currentTime=new java.util.Date();
+		String datetime=formatter.format(currentTime).toString();
+		showText.setText(showText.getText()+datetime);
+		}
+	
+	
+	if(e.getSource()==item3_1) {//自动回行
+	
+	showText.setLineWrap(true);//文本自动回行
+	showText.setWrapStyleWord(true);//文本区以单词为界自动换行
+	//上两个功能应该在点击“自动换行”后实现
+	//需要在该菜单项中注册监视器
+	}
+	
+	
+	if(e.getSource()==item3_2) {//字体
+		FontDialog dialog=new FontDialog(this);
+		dialog.setVisible(true);
+		if(dialog.getState()==FontDialog.YES) {
+			showText.setFont(dialog.getFont());
+			showText.repaint();
+			
+		}
+		if(dialog.getState()==FontDialog.NO) {
+			showText.repaint();
+		}
+	}
+	if(e.getSource()==item4_1) {//状态栏
+		statusline.setVisible(false);
+	}
+	//问题：无法实现再点击一次显示状态栏
+	
+	if(e.getSource()==item5_1) {//帮助
+		Desktop desktop=Desktop.getDesktop();
+		try{
+		String str="https://cn.bing.com/search?q=%e8%8e%b7%e5%8f%96%e6%9c%89%e5%85%b3+windows+10+%e4%b8%ad%e7%9a%84%e8%ae%b0%e4%ba%8b%e6%9c%ac%e7%9a%84%e5%b8%ae%e5%8a%a9&qs=HS&sc=2-0&cvid=80C227E8B38C4ABBB70529DBA387ADCE&FORM=QBLH&sp=1";
+		desktop.browse(new URI(str));
+		}
+		catch(Exception ex) {
+		     ex.printStackTrace();
+		}
+	}
+	//点击帮助菜单项自动跳转网页
+	
+	if(e.getSource()==item5_2) {//关于记事本功能
+		About about=new About(this);
+		about.setVisible(true);
+		}
+	
+	}
+	
+	//实现DocumentListener接口中的方法  
+    public void removeUpdate(DocumentEvent e)  
+    {   item2_1.setEnabled(true);  
+    }  
+    public void insertUpdate(DocumentEvent e)  
+    {   item2_1.setEnabled(true);  
+    }  
+    public void changedUpdate(DocumentEvent e)  
+    {   item2_1.setEnabled(true);  
+    }//DocumentListener结束  
+  
+    //实现接口UndoableEditListener的类UndoHandler  
+    class UndoHandler implements UndoableEditListener  
+    {   public void undoableEditHappened(UndoableEditEvent uee)  
+        {   undo.addEdit(uee.getEdit());  
+        }  
+    }  
+	}
\ No newline at end of file