java实现记事本之Java记事本源码及实现

今天给大家介绍一下关于如何用Java实现记事本功能，是学习Java swing的一个非常好的案例，下面先看一下运行结果(下载地址在最下面)：

下面我们来看源码：

 import java.awt.*; import java.awt.event.*; import java.text.*; import java.util.*; import java.io.*; import javax.swing.undo.*; import javax.swing.border.*; import javax.swing.*; import javax.swing.text.*; import javax.swing.event.*;import java.awt.datatransfer.*;public class Notepad extends JFrame implements ActionListener,DocumentListener{//菜单JMenu fileMenu,editMenu,formatMenu,viewMenu,helpMenu;//右键弹出菜单项JPopupMenu popupMenu;JMenuItem popupMenu_Undo,popupMenu_Cut,popupMenu_Copy,popupMenu_Paste,popupMenu_Delete,popupMenu_SelectAll;//“文件”的菜单项JMenuItem fileMenu_New,fileMenu_Open,fileMenu_Save,fileMenu_SaveAs,fileMenu_PageSetUp,fileMenu_Print,fileMenu_Exit;//“编辑”的菜单项JMenuItem editMenu_Undo,editMenu_Cut,editMenu_Copy,editMenu_Paste,editMenu_Delete,editMenu_Find,editMenu_FindNext,editMenu_Replace,editMenu_GoTo,editMenu_SelectAll,editMenu_TimeDate;//“格式”的菜单项JCheckBoxMenuItem formatMenu_LineWrap;JMenuItem formatMenu_Font;//“查看”的菜单项JCheckBoxMenuItem viewMenu_Status;//“帮助”的菜单项JMenuItem helpMenu_HelpTopics,helpMenu_AboutNotepad;//“文本”编辑区域JTextArea editArea;//状态栏标签JLabel statusLabel;//系统剪贴板Toolkit toolkit=Toolkit.getDefaultToolkit();Clipboard clipBoard=toolkit.getSystemClipboard();//创建撤销操作管理器(与撤销操作有关)protected UndoManager undo=new UndoManager();protected UndoableEditListener undoHandler=new UndoHandler();//其他变量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//构造函数开始public Notepad(){super("Java记事本");//改变系统默认字体Font font = new Font("Dialog", Font.PLAIN, 12);java.util.Enumeration keys = UIManager.getDefaults().keys();while (keys.hasMoreElements()) {Object key = keys.nextElement();Object value = UIManager.get(key);if (value instanceof javax.swing.plaf.FontUIResource) {UIManager.put(key, font);}}//创建菜单条JMenuBar menuBar=new JMenuBar();//创建文件菜单及菜单项并注册事件监听fileMenu=new JMenu("文件(F)");fileMenu.setMnemonic('F');//设置快捷键ALT+FfileMenu_New=new JMenuItem("新建(N)");fileMenu_New.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK));fileMenu_New.addActionListener(this);fileMenu_Open=new JMenuItem("打开(O)...");fileMenu_Open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));fileMenu_Open.addActionListener(this);fileMenu_Save=new JMenuItem("保存(S)");fileMenu_Save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));fileMenu_Save.addActionListener(this);fileMenu_SaveAs=new JMenuItem("另存为(A)...");fileMenu_SaveAs.addActionListener(this);fileMenu_PageSetUp=new JMenuItem("页面设置(U)...");fileMenu_PageSetUp.addActionListener(this);fileMenu_Print=new JMenuItem("打印(P)...");fileMenu_Print.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, InputEvent.CTRL_MASK)); fileMenu_Print.addActionListener(this);fileMenu_Exit=new JMenuItem("退出(X)");fileMenu_Exit.addActionListener(this);//创建编辑菜单及菜单项并注册事件监听editMenu=new JMenu("编辑(E)");editMenu.setMnemonic('E');//设置快捷键ALT+E//当选择编辑菜单时，设置剪切、复制、粘贴、删除等功能的可用性editMenu.addMenuListener(new MenuListener(){public void menuCanceled(MenuEvent e)//取消菜单时调用{checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性}public void menuDeselected(MenuEvent e)//取消选择某个菜单时调用{checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性}public void menuSelected(MenuEvent e)//选择某个菜单时调用{checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性}});editMenu_Undo=new JMenuItem("撤销(U)");editMenu_Undo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,InputEvent.CTRL_MASK));editMenu_Undo.addActionListener(this);editMenu_Undo.setEnabled(false);editMenu_Cut=new JMenuItem("剪切(T)");editMenu_Cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));editMenu_Cut.addActionListener(this);editMenu_Copy=new JMenuItem("复制(C)");editMenu_Copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));editMenu_Copy.addActionListener(this);editMenu_Paste=new JMenuItem("粘贴(P)");editMenu_Paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));editMenu_Paste.addActionListener(this);editMenu_Delete=new JMenuItem("删除(D)");editMenu_Delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));editMenu_Delete.addActionListener(this);editMenu_Find=new JMenuItem("查找(F)...");editMenu_Find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F,InputEvent.CTRL_MASK));editMenu_Find.addActionListener(this);editMenu_FindNext=new JMenuItem("查找下一个(N)");editMenu_FindNext.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3,0));editMenu_FindNext.addActionListener(this);editMenu_Replace = new JMenuItem("替换(R)...",'R'); editMenu_Replace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H, InputEvent.CTRL_MASK)); editMenu_Replace.addActionListener(this);editMenu_GoTo = new JMenuItem("转到(G)...",'G'); editMenu_GoTo.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G, InputEvent.CTRL_MASK)); editMenu_GoTo.addActionListener(this);editMenu_SelectAll = new JMenuItem("全选",'A'); editMenu_SelectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK)); editMenu_SelectAll.addActionListener(this);editMenu_TimeDate = new JMenuItem("时间/日期(D)",'D');editMenu_TimeDate.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5,0));editMenu_TimeDate.addActionListener(this);//创建格式菜单及菜单项并注册事件监听formatMenu=new JMenu("格式(O)");formatMenu.setMnemonic('O');//设置快捷键ALT+OformatMenu_LineWrap=new JCheckBoxMenuItem("自动换行(W)");formatMenu_LineWrap.setMnemonic('W');//设置快捷键ALT+WformatMenu_LineWrap.setState(true);formatMenu_LineWrap.addActionListener(this);formatMenu_Font=new JMenuItem("字体(F)...");formatMenu_Font.addActionListener(this);//创建查看菜单及菜单项并注册事件监听viewMenu=new JMenu("查看(V)");viewMenu.setMnemonic('V');//设置快捷键ALT+VviewMenu_Status=new JCheckBoxMenuItem("状态栏(S)");viewMenu_Status.setMnemonic('S');//设置快捷键ALT+SviewMenu_Status.setState(true);viewMenu_Status.addActionListener(this);//创建帮助菜单及菜单项并注册事件监听helpMenu = new JMenu("帮助(H)");helpMenu.setMnemonic('H');//设置快捷键ALT+HhelpMenu_HelpTopics = new JMenuItem("帮助主题(H)"); helpMenu_HelpTopics.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1,0));helpMenu_HelpTopics.addActionListener(this);helpMenu_AboutNotepad = new JMenuItem("关于记事本(A)"); helpMenu_AboutNotepad.addActionListener(this);//向菜单条添加"文件"菜单及菜单项menuBar.add(fileMenu); fileMenu.add(fileMenu_New); fileMenu.add(fileMenu_Open); fileMenu.add(fileMenu_Save); fileMenu.add(fileMenu_SaveAs); fileMenu.addSeparator();//分隔线fileMenu.add(fileMenu_PageSetUp); fileMenu.add(fileMenu_Print); fileMenu.addSeparator();//分隔线 fileMenu.add(fileMenu_Exit); //向菜单条添加"编辑"菜单及菜单项 menuBar.add(editMenu); editMenu.add(editMenu_Undo);  editMenu.addSeparator();//分隔线 editMenu.add(editMenu_Cut); editMenu.add(editMenu_Copy); editMenu.add(editMenu_Paste); editMenu.add(editMenu_Delete); editMenu.addSeparator(); //分隔线editMenu.add(editMenu_Find); editMenu.add(editMenu_FindNext); editMenu.add(editMenu_Replace);editMenu.add(editMenu_GoTo); editMenu.addSeparator();  //分隔线editMenu.add(editMenu_SelectAll); editMenu.add(editMenu_TimeDate);//向菜单条添加"格式"菜单及菜单项menuBar.add(formatMenu); formatMenu.add(formatMenu_LineWrap); formatMenu.add(formatMenu_Font);//向菜单条添加"查看"菜单及菜单项 menuBar.add(viewMenu); viewMenu.add(viewMenu_Status);//向菜单条添加"帮助"菜单及菜单项menuBar.add(helpMenu);helpMenu.add(helpMenu_HelpTopics);helpMenu.addSeparator();helpMenu.add(helpMenu_AboutNotepad);//向窗口添加菜单条this.setJMenuBar(menuBar);//创建文本编辑区并添加滚动条editArea=new JTextArea(20,50);JScrollPane scroller=new JScrollPane(editArea);scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);this.add(scroller,BorderLayout.CENTER);//向窗口添加文本编辑区editArea.setWrapStyleWord(true);//设置单词在一行不足容纳时换行editArea.setLineWrap(true);//设置文本编辑区自动换行默认为true,即会"自动换行"//this.add(editArea,BorderLayout.CENTER);//向窗口添加文本编辑区oldValue=editArea.getText();//获取原文本编辑区的内容//编辑区注册事件监听(与撤销操作有关)editArea.getDocument().addUndoableEditListener(undoHandler);editArea.getDocument().addDocumentListener(this);//创建右键弹出菜单popupMenu=new JPopupMenu();popupMenu_Undo=new JMenuItem("撤销(U)");popupMenu_Cut=new JMenuItem("剪切(T)");popupMenu_Copy=new JMenuItem("复制(C)");popupMenu_Paste=new JMenuItem("粘帖(P)");popupMenu_Delete=new JMenuItem("删除(D)");popupMenu_SelectAll=new JMenuItem("全选(A)");popupMenu_Undo.setEnabled(false);//向右键菜单添加菜单项和分隔符popupMenu.add(popupMenu_Undo);popupMenu.addSeparator();popupMenu.add(popupMenu_Cut);popupMenu.add(popupMenu_Copy);popupMenu.add(popupMenu_Paste);popupMenu.add(popupMenu_Delete);popupMenu.addSeparator();popupMenu.add(popupMenu_SelectAll);//文本编辑区注册右键菜单事件popupMenu_Undo.addActionListener(this);popupMenu_Cut.addActionListener(this);popupMenu_Copy.addActionListener(this);popupMenu_Paste.addActionListener(this);popupMenu_Delete.addActionListener(this);popupMenu_SelectAll.addActionListener(this);//文本编辑区注册右键菜单事件editArea.addMouseListener(new MouseAdapter(){public void mousePressed(MouseEvent e){if(e.isPopupTrigger())//返回此鼠标事件是否为该平台的弹出菜单触发事件{popupMenu.show(e.getComponent(),e.getX(),e.getY());//在组件调用者的坐标空间中的位置 X、Y 显示弹出菜单}checkMenuItemEnabled();//设置剪切，复制，粘帖，删除等功能的可用性editArea.requestFocus();//编辑区获取焦点}public void mouseReleased(MouseEvent e){if(e.isPopupTrigger())//返回此鼠标事件是否为该平台的弹出菜单触发事件{popupMenu.show(e.getComponent(),e.getX(),e.getY());//在组件调用者的坐标空间中的位置 X、Y 显示弹出菜单}checkMenuItemEnabled();//设置剪切，复制，粘帖，删除等功能的可用性editArea.requestFocus();//编辑区获取焦点}});//文本编辑区注册右键菜单事件结束//创建和添加状态栏statusLabel=new JLabel("　按F1获取帮助");this.add(statusLabel,BorderLayout.SOUTH);//向窗口添加状态栏标签//设置窗口在屏幕上的位置、大小和可见性 this.setLocation(100,100);this.setSize(650,550);this.setVisible(true);//添加窗口监听器addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){exitWindowChoose();}});checkMenuItemEnabled();editArea.requestFocus();}//构造函数Notepad结束//设置菜单项的可用性：剪切，复制，粘帖，删除功能public void checkMenuItemEnabled(){String selectText=editArea.getSelectedText();if(selectText==null){editMenu_Cut.setEnabled(false);popupMenu_Cut.setEnabled(false);editMenu_Copy.setEnabled(false);popupMenu_Copy.setEnabled(false);editMenu_Delete.setEnabled(false);popupMenu_Delete.setEnabled(false);}else{editMenu_Cut.setEnabled(true);popupMenu_Cut.setEnabled(true); editMenu_Copy.setEnabled(true);popupMenu_Copy.setEnabled(true);editMenu_Delete.setEnabled(true);popupMenu_Delete.setEnabled(true);}//粘帖功能可用性判断Transferable contents=clipBoard.getContents(this);if(contents==null){editMenu_Paste.setEnabled(false);popupMenu_Paste.setEnabled(false);}else{editMenu_Paste.setEnabled(true);popupMenu_Paste.setEnabled(true);}}//方法checkMenuItemEnabled()结束//关闭窗口时调用public void exitWindowChoose(){editArea.requestFocus();String currentValue=editArea.getText();if(currentValue.equals(oldValue)==true){System.exit(0);}else{int exitChoose=JOptionPane.showConfirmDialog(this,"您的文件尚未保存，是否保存？","退出提示",JOptionPane.YES_NO_CANCEL_OPTION);if(exitChoose==JOptionPane.YES_OPTION){//boolean isSave=false;if(isNewFile){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){statusLabel.setText("　您没有保存文件");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{FileWriter fw=new FileWriter(saveFileName);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();fw.close();isNewFile=false;currentFile=saveFileName;oldValue=editArea.getText();this.setTitle(saveFileName.getName()+"  - 记事本");statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());//isSave=true;}catch(IOException ioException){}}}else{try{FileWriter fw=new FileWriter(currentFile);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();fw.close();//isSave=true;}catch(IOException ioException){}}System.exit(0);//if(isSave)System.exit(0);//else return;}else if(exitChoose==JOptionPane.NO_OPTION){System.exit(0);}else{return;}}}//关闭窗口时调用方法结束//查找方法public void find(){final JDialog findDialog=new JDialog(this,"查找",false);//false时允许其他窗口同时处于激活状态(即无模式)Container con=findDialog.getContentPane();//返回此对话框的contentPane对象con.setLayout(new FlowLayout(FlowLayout.LEFT));JLabel findContentLabel=new JLabel("查找内容(N)：");final JTextField findText=new JTextField(15);JButton findNextButton=new JButton("查找下一个(F)：");final JCheckBox matchCheckBox=new JCheckBox("区分大小写(C)");ButtonGroup bGroup=new ButtonGroup();final JRadioButton upButton=new JRadioButton("向上(U)");final JRadioButton downButton=new JRadioButton("向下(U)");downButton.setSelected(true);bGroup.add(upButton);bGroup.add(downButton);/*ButtonGroup此类用于为一组按钮创建一个多斥（multiple-exclusion）作用域。使用相同的 ButtonGroup 对象创建一组按钮意味着“开启”其中一个按钮时，将关闭组中的其他所有按钮。*//*JRadioButton此类实现一个单选按钮，此按钮项可被选择或取消选择，并可为用户显示其状态。与 ButtonGroup 对象配合使用可创建一组按钮，一次只能选择其中的一个按钮。（创建一个 ButtonGroup 对象并用其 add 方法将 JRadioButton 对象包含在此组中。）*/JButton cancel=new JButton("取消");//取消按钮事件处理cancel.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){findDialog.dispose();}});//"查找下一个"按钮监听findNextButton.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){//"区分大小写(C)"的JCheckBox是否被选中int k=0,m=0;final String str1,str2,str3,str4,strA,strB;str1=editArea.getText();str2=findText.getText();str3=str1.toUpperCase();str4=str2.toUpperCase();if(matchCheckBox.isSelected())//区分大小写{strA=str1;strB=str2;}else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找 {strA=str3;strB=str4;}if(upButton.isSelected()){//k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);if(editArea.getSelectedText()==null)k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);elsek=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);}}else if(downButton.isSelected()){if(editArea.getSelectedText()==null)k=strA.indexOf(strB,editArea.getCaretPosition()+1);elsek=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);}}}});//"查找下一个"按钮监听结束//创建"查找"对话框的界面JPanel panel1=new JPanel();JPanel panel2=new JPanel();JPanel panel3=new JPanel();JPanel directionPanel=new JPanel();directionPanel.setBorder(BorderFactory.createTitledBorder("方向"));//设置directionPanel组件的边框;//BorderFactory.createTitledBorder(String title)创建一个新标题边框，使用默认边框（浮雕化）、默认文本位置（位于顶线上）、默认调整 (leading) 以及由当前外观确定的默认字体和文本颜色，并指定了标题文本。directionPanel.add(upButton);directionPanel.add(downButton);panel1.setLayout(new GridLayout(2,1));panel1.add(findNextButton);panel1.add(cancel);panel2.add(findContentLabel);panel2.add(findText);panel2.add(panel1);panel3.add(matchCheckBox);panel3.add(directionPanel);con.add(panel2);con.add(panel3);findDialog.setSize(410,180);findDialog.setResizable(false);//不可调整大小findDialog.setLocation(230,280);findDialog.setVisible(true);}//查找方法结束//替换方法public void replace(){final JDialog replaceDialog=new JDialog(this,"替换",false);//false时允许其他窗口同时处于激活状态(即无模式)Container con=replaceDialog.getContentPane();//返回此对话框的contentPane对象con.setLayout(new FlowLayout(FlowLayout.CENTER));JLabel findContentLabel=new JLabel("查找内容(N)：");final JTextField findText=new JTextField(15);JButton findNextButton=new JButton("查找下一个(F):");JLabel replaceLabel=new JLabel("替换为(P)：");final JTextField replaceText=new JTextField(15);JButton replaceButton=new JButton("替换(R)");JButton replaceAllButton=new JButton("全部替换(A)");JButton cancel=new JButton("取消");cancel.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){replaceDialog.dispose();}});final JCheckBox matchCheckBox=new JCheckBox("区分大小写(C)");ButtonGroup bGroup=new ButtonGroup();final JRadioButton upButton=new JRadioButton("向上(U)");final JRadioButton downButton=new JRadioButton("向下(U)");downButton.setSelected(true);bGroup.add(upButton);bGroup.add(downButton);/*ButtonGroup此类用于为一组按钮创建一个多斥（multiple-exclusion）作用域。使用相同的 ButtonGroup 对象创建一组按钮意味着“开启”其中一个按钮时，将关闭组中的其他所有按钮。*//*JRadioButton此类实现一个单选按钮，此按钮项可被选择或取消选择，并可为用户显示其状态。与 ButtonGroup 对象配合使用可创建一组按钮，一次只能选择其中的一个按钮。（创建一个 ButtonGroup 对象并用其 add 方法将 JRadioButton 对象包含在此组中。）*///"查找下一个"按钮监听findNextButton.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){//"区分大小写(C)"的JCheckBox是否被选中int k=0,m=0;final String str1,str2,str3,str4,strA,strB;str1=editArea.getText();str2=findText.getText();str3=str1.toUpperCase();str4=str2.toUpperCase();if(matchCheckBox.isSelected())//区分大小写{strA=str1;strB=str2;}else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找 {strA=str3;strB=str4;}if(upButton.isSelected()){//k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);if(editArea.getSelectedText()==null)k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);elsek=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);}}else if(downButton.isSelected()){if(editArea.getSelectedText()==null)k=strA.indexOf(strB,editArea.getCaretPosition()+1);elsek=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{JOptionPane.showMessageDialog(null,"找不到您查找的内容！","查找",JOptionPane.INFORMATION_MESSAGE);}}}});//"查找下一个"按钮监听结束//"替换"按钮监听replaceButton.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if(replaceText.getText().length()==0 && editArea.getSelectedText()!=null) editArea.replaceSelection(""); if(replaceText.getText().length()>0 && editArea.getSelectedText()!=null) editArea.replaceSelection(replaceText.getText());}});//"替换"按钮监听结束//"全部替换"按钮监听replaceAllButton.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){editArea.setCaretPosition(0);//将光标放到编辑区开头int k=0,m=0,replaceCount=0;if(findText.getText().length()==0){JOptionPane.showMessageDialog(replaceDialog,"请填写查找内容!","提示",JOptionPane.WARNING_MESSAGE);findText.requestFocus(true);return;}while(k>-1)//当文本中有内容被选中时(k>-1被选中)进行替换，否则不进行while循环{//"区分大小写(C)"的JCheckBox是否被选中//int k=0,m=0;final String str1,str2,str3,str4,strA,strB;str1=editArea.getText();str2=findText.getText();str3=str1.toUpperCase();str4=str2.toUpperCase();if(matchCheckBox.isSelected())//区分大小写{strA=str1;strB=str2;}else//不区分大小写,此时把所选内容全部化成大写(或小写)，以便于查找 {strA=str3;strB=str4;}if(upButton.isSelected()){//k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);if(editArea.getSelectedText()==null)k=strA.lastIndexOf(strB,editArea.getCaretPosition()-1);elsek=strA.lastIndexOf(strB, editArea.getCaretPosition()-findText.getText().length()-1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{if(replaceCount==0){JOptionPane.showMessageDialog(replaceDialog, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE); }else{JOptionPane.showMessageDialog(replaceDialog,"成功替换"+replaceCount+"个匹配内容!","替换成功",JOptionPane.INFORMATION_MESSAGE);}}}else if(downButton.isSelected()){if(editArea.getSelectedText()==null)k=strA.indexOf(strB,editArea.getCaretPosition()+1);elsek=strA.indexOf(strB, editArea.getCaretPosition()-findText.getText().length()+1);if(k>-1){//String strData=strA.subString(k,strB.getText().length()+1);editArea.setCaretPosition(k);editArea.select(k,k+strB.length());}else{if(replaceCount==0){JOptionPane.showMessageDialog(replaceDialog, "找不到您查找的内容!", "记事本",JOptionPane.INFORMATION_MESSAGE); }else{JOptionPane.showMessageDialog(replaceDialog,"成功替换"+replaceCount+"个匹配内容!","替换成功",JOptionPane.INFORMATION_MESSAGE);}}}if(replaceText.getText().length()==0 && editArea.getSelectedText()!= null){editArea.replaceSelection("");replaceCount++;} if(replaceText.getText().length()>0 && editArea.getSelectedText()!= null) {editArea.replaceSelection(replaceText.getText()); replaceCount++;}}//while循环结束}});//"替换全部"方法结束//创建"替换"对话框的界面JPanel directionPanel=new JPanel();directionPanel.setBorder(BorderFactory.createTitledBorder("方向"));//设置directionPanel组件的边框;//BorderFactory.createTitledBorder(String title)创建一个新标题边框，使用默认边框（浮雕化）、默认文本位置（位于顶线上）、默认调整 (leading) 以及由当前外观确定的默认字体和文本颜色，并指定了标题文本。directionPanel.add(upButton);directionPanel.add(downButton);JPanel panel1=new JPanel();JPanel panel2=new JPanel();JPanel panel3=new JPanel();JPanel panel4=new JPanel();panel4.setLayout(new GridLayout(2,1));panel1.add(findContentLabel);panel1.add(findText);panel1.add(findNextButton);panel4.add(replaceButton);panel4.add(replaceAllButton);panel2.add(replaceLabel);panel2.add(replaceText);panel2.add(panel4);panel3.add(matchCheckBox);panel3.add(directionPanel);panel3.add(cancel);con.add(panel1);con.add(panel2);con.add(panel3);replaceDialog.setSize(420,220);replaceDialog.setResizable(false);//不可调整大小replaceDialog.setLocation(230,280);replaceDialog.setVisible(true);}//"全部替换"按钮监听结束//"字体"方法public void font(){final JDialog fontDialog=new JDialog(this,"字体设置",false);Container con=fontDialog.getContentPane();con.setLayout(new FlowLayout(FlowLayout.LEFT));JLabel fontLabel=new JLabel("字体(F)：");fontLabel.setPreferredSize(new Dimension(100,20));//构造一个Dimension，并将其初始化为指定宽度和高度JLabel styleLabel=new JLabel("字形(Y)：");styleLabel.setPreferredSize(new Dimension(100,20));JLabel sizeLabel=new JLabel("大小(S)：");sizeLabel.setPreferredSize(new Dimension(100,20));final JLabel sample=new JLabel("张选仲的记事本-ZXZ's Notepad");//sample.setHorizontalAlignment(SwingConstants.CENTER);final JTextField fontText=new JTextField(9);fontText.setPreferredSize(new Dimension(200,20));final JTextField styleText=new JTextField(8);styleText.setPreferredSize(new Dimension(200,20));final int style[]={Font.PLAIN,Font.BOLD,Font.ITALIC,Font.BOLD+Font.ITALIC};final JTextField sizeText=new JTextField(5);sizeText.setPreferredSize(new Dimension(200,20));JButton okButton=new JButton("确定");JButton cancel=new JButton("取消");cancel.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){fontDialog.dispose();}});Font currentFont=editArea.getFont();fontText.setText(currentFont.getFontName());fontText.selectAll();//styleText.setText(currentFont.getStyle());//styleText.selectAll();if(currentFont.getStyle()==Font.PLAIN)styleText.setText("常规");else if(currentFont.getStyle()==Font.BOLD)styleText.setText("粗体");else if(currentFont.getStyle()==Font.ITALIC)styleText.setText("斜体");else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))styleText.setText("粗斜体");styleText.selectAll();String str=String.valueOf(currentFont.getSize());sizeText.setText(str);sizeText.selectAll();final JList fontList,styleList,sizeList;GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();final String fontName[]=ge.getAvailableFontFamilyNames();fontList=new JList(fontName);fontList.setFixedCellWidth(86);fontList.setFixedCellHeight(20);fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);final String fontStyle[]={"常规","粗体","斜体","粗斜体"};styleList=new JList(fontStyle);styleList.setFixedCellWidth(86);styleList.setFixedCellHeight(20);styleList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);if(currentFont.getStyle()==Font.PLAIN)styleList.setSelectedIndex(0);else if(currentFont.getStyle()==Font.BOLD)styleList.setSelectedIndex(1);else if(currentFont.getStyle()==Font.ITALIC)styleList.setSelectedIndex(2);else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))styleList.setSelectedIndex(3);final String fontSize[]={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};sizeList=new JList(fontSize);sizeList.setFixedCellWidth(43);sizeList.setFixedCellHeight(20);sizeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);fontList.addListSelectionListener(new ListSelectionListener(){public void valueChanged(ListSelectionEvent event){fontText.setText(fontName[fontList.getSelectedIndex()]);fontText.selectAll();Font sampleFont1=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));sample.setFont(sampleFont1);}});styleList.addListSelectionListener(new ListSelectionListener(){public void valueChanged(ListSelectionEvent event){int s=style[styleList.getSelectedIndex()];styleText.setText(fontStyle[s]);styleText.selectAll();Font sampleFont2=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));sample.setFont(sampleFont2);}});sizeList.addListSelectionListener(new ListSelectionListener(){public void valueChanged(ListSelectionEvent event){sizeText.setText(fontSize[sizeList.getSelectedIndex()]);//sizeText.requestFocus();sizeText.selectAll();Font sampleFont3=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));sample.setFont(sampleFont3);}});okButton.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){Font okFont=new Font(fontText.getText(),style[styleList.getSelectedIndex()],Integer.parseInt(sizeText.getText()));editArea.setFont(okFont);fontDialog.dispose();}});JPanel samplePanel=new JPanel();samplePanel.setBorder(BorderFactory.createTitledBorder("示例"));//samplePanel.setLayout(new FlowLayout(FlowLayout.CENTER));samplePanel.add(sample);JPanel panel1=new JPanel();JPanel panel2=new JPanel();JPanel panel3=new JPanel();//JPanel panel4=new JPanel();//JPanel panel5=new JPanel();//panel1.add(fontLabel);//panel1.add(styleLabel);//panel1.add(sizeLabel);//panel2.add(fontText);//panel2.add(new JScrollPane(fontList));//JList不支持直接滚动，所以要让JList作为JScrollPane的视口视图//panel2.setLayout(new GridLayout(2,1));//panel3.add(styleText);//panel3.add(new JScrollPane(styleList));//panel3.setLayout(new GridLayout(2,1));//panel4.add(sizeText);//panel4.add(new JScrollPane(sizeText));//panel4.setLayout(new GridLayout(2,1));//panel5.add(okButton);//panel5.add(cancel);//con.add(panel1);//con.add(panel2);//con.add(panel3);//con.add(panel4);//con.add(panel5);panel2.add(fontText);panel2.add(styleText);panel2.add(sizeText);panel2.add(okButton);panel3.add(new JScrollPane(fontList));//JList不支持直接滚动，所以要让JList作为JScrollPane的视口视图panel3.add(new JScrollPane(styleList));panel3.add(new JScrollPane(sizeList));panel3.add(cancel);con.add(panel1);con.add(panel2);con.add(panel3);con.add(samplePanel);fontDialog.setSize(350,340);fontDialog.setLocation(200,200);fontDialog.setResizable(false);fontDialog.setVisible(true);}//public void menuPerformed(MenuEvent e)//{checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性//}public void actionPerformed(ActionEvent e){//新建if(e.getSource()==fileMenu_New){editArea.requestFocus();String currentValue=editArea.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){statusLabel.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{FileWriter fw=new FileWriter(saveFileName);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();//刷新该流的缓冲bfw.close();isNewFile=false;currentFile=saveFileName;oldValue=editArea.getText();this.setTitle(saveFileName.getName()+" - 记事本");statusLabel.setText("当前打开文件："+saveFileName.getAbsoluteFile());}catch (IOException ioException){}}}else if(saveChoose==JOptionPane.NO_OPTION){editArea.replaceRange("",0,editArea.getText().length());statusLabel.setText(" 新建文件");this.setTitle("无标题 - 记事本");isNewFile=true;undo.discardAllEdits();//撤消所有的"撤消"操作editMenu_Undo.setEnabled(false);oldValue=editArea.getText();}else if(saveChoose==JOptionPane.CANCEL_OPTION){return;}}else{editArea.replaceRange("",0,editArea.getText().length());statusLabel.setText(" 新建文件");this.setTitle("无标题 - 记事本");isNewFile=true;undo.discardAllEdits();//撤消所有的"撤消"操作editMenu_Undo.setEnabled(false);oldValue=editArea.getText();}}//新建结束//打开else if(e.getSource()==fileMenu_Open){editArea.requestFocus();String currentValue=editArea.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){statusLabel.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{FileWriter fw=new FileWriter(saveFileName);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();//刷新该流的缓冲bfw.close();isNewFile=false;currentFile=saveFileName;oldValue=editArea.getText();this.setTitle(saveFileName.getName()+" - 记事本");statusLabel.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){statusLabel.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{FileReader fr=new FileReader(fileName);BufferedReader bfr=new BufferedReader(fr);editArea.setText("");while((str=bfr.readLine())!=null){editArea.append(str);}this.setTitle(fileName.getName()+" - 记事本");statusLabel.setText(" 当前打开文件："+fileName.getAbsoluteFile());fr.close();isNewFile=false;currentFile=fileName;oldValue=editArea.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){statusLabel.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{FileReader fr=new FileReader(fileName);BufferedReader bfr=new BufferedReader(fr);editArea.setText("");while((str=bfr.readLine())!=null){editArea.append(str);}this.setTitle(fileName.getName()+" - 记事本");statusLabel.setText(" 当前打开文件："+fileName.getAbsoluteFile());fr.close();isNewFile=false;currentFile=fileName;oldValue=editArea.getText();}catch (IOException ioException){}}}}//打开结束//保存else if(e.getSource()==fileMenu_Save){editArea.requestFocus();if(isNewFile){String str=null;JFileChooser fileChooser=new JFileChooser();fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);//fileChooser.setApproveButtonText("确定");fileChooser.setDialogTitle("保存");int result=fileChooser.showSaveDialog(this);if(result==JFileChooser.CANCEL_OPTION){statusLabel.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{FileWriter fw=new FileWriter(saveFileName);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();//刷新该流的缓冲bfw.close();isNewFile=false;currentFile=saveFileName;oldValue=editArea.getText();this.setTitle(saveFileName.getName()+" - 记事本");statusLabel.setText("当前打开文件："+saveFileName.getAbsoluteFile());}catch (IOException ioException){}}}else{try{FileWriter fw=new FileWriter(currentFile);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();fw.close();}catch(IOException ioException){}}}//保存结束//另存为else if(e.getSource()==fileMenu_SaveAs){editArea.requestFocus();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){statusLabel.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{FileWriter fw=new FileWriter(saveFileName);BufferedWriter bfw=new BufferedWriter(fw);bfw.write(editArea.getText(),0,editArea.getText().length());bfw.flush();fw.close();oldValue=editArea.getText();this.setTitle(saveFileName.getName()+"  - 记事本");statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());}catch(IOException ioException){}}}//另存为结束//页面设置else if(e.getSource()==fileMenu_PageSetUp){editArea.requestFocus();JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);}//页面设置结束//打印else if(e.getSource()==fileMenu_Print){editArea.requestFocus();JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);}//打印结束//退出else if(e.getSource()==fileMenu_Exit){int exitChoose=JOptionPane.showConfirmDialog(this,"确定要退出吗?","退出提示",JOptionPane.OK_CANCEL_OPTION);if(exitChoose==JOptionPane.OK_OPTION){System.exit(0);}else{return;}}//退出结束//编辑//else if(e.getSource()==editMenu)//{checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性//}//编辑结束//撤销else if(e.getSource()==editMenu_Undo || e.getSource()==popupMenu_Undo){editArea.requestFocus();if(undo.canUndo()){try{undo.undo();}catch (CannotUndoException ex){System.out.println("Unable to undo:" + ex);//ex.printStackTrace();}}if(!undo.canUndo()){editMenu_Undo.setEnabled(false);}}//撤销结束//剪切else if(e.getSource()==editMenu_Cut || e.getSource()==popupMenu_Cut){editArea.requestFocus();String text=editArea.getSelectedText();StringSelection selection=new StringSelection(text);clipBoard.setContents(selection,null);editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());checkMenuItemEnabled();//设置剪切，复制，粘帖，删除功能的可用性}//剪切结束//复制else if(e.getSource()==editMenu_Copy || e.getSource()==popupMenu_Copy){editArea.requestFocus();String text=editArea.getSelectedText();StringSelection selection=new StringSelection(text);clipBoard.setContents(selection,null);checkMenuItemEnabled();//设置剪切，复制，粘帖，删除功能的可用性}//复制结束//粘帖else if(e.getSource()==editMenu_Paste || e.getSource()==popupMenu_Paste){editArea.requestFocus();Transferable contents=clipBoard.getContents(this);if(contents==null)return;String text="";try{text=(String)contents.getTransferData(DataFlavor.stringFlavor);}catch (Exception exception){}editArea.replaceRange(text,editArea.getSelectionStart(),editArea.getSelectionEnd());checkMenuItemEnabled();}//粘帖结束//删除else if(e.getSource()==editMenu_Delete || e.getSource()==popupMenu_Delete){editArea.requestFocus();editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());checkMenuItemEnabled();//设置剪切、复制、粘贴、删除等功能的可用性}//删除结束//查找else if(e.getSource()==editMenu_Find){editArea.requestFocus();find();}//查找结束//查找下一个else if(e.getSource()==editMenu_FindNext){editArea.requestFocus();find();}//查找下一个结束//替换else if(e.getSource()==editMenu_Replace){editArea.requestFocus();replace();}//替换结束//转到else if(e.getSource()==editMenu_GoTo){editArea.requestFocus();JOptionPane.showMessageDialog(this,"对不起，此功能尚未实现！更多请看http://pan.muyi.so","提示",JOptionPane.WARNING_MESSAGE);}//转到结束//时间日期else if(e.getSource()==editMenu_TimeDate){editArea.requestFocus();//SimpleDateFormat currentDateTime=new SimpleDateFormat("HH:mmyyyy-MM-dd");//editArea.insert(currentDateTime.format(new Date()),editArea.getCaretPosition());Calendar rightNow=Calendar.getInstance();Date date=rightNow.getTime();editArea.insert(date.toString(),editArea.getCaretPosition());}//时间日期结束//全选else if(e.getSource()==editMenu_SelectAll || e.getSource()==popupMenu_SelectAll){editArea.selectAll();}//全选结束//自动换行(已在前面设置)else if(e.getSource()==formatMenu_LineWrap){if(formatMenu_LineWrap.getState())editArea.setLineWrap(true);else editArea.setLineWrap(false);}//自动换行结束//字体设置else if(e.getSource()==formatMenu_Font){editArea.requestFocus();font();}//字体设置结束//设置状态栏可见性else if(e.getSource()==viewMenu_Status){if(viewMenu_Status.getState())statusLabel.setVisible(true);else statusLabel.setVisible(false);}//设置状态栏可见性结束//帮助主题else if(e.getSource()==helpMenu_HelpTopics){editArea.requestFocus();JOptionPane.showMessageDialog(this,"路漫漫其修远兮，吾将上下而求索。","帮助主题",JOptionPane.INFORMATION_MESSAGE);}//帮助主题结束//关于else if(e.getSource()==helpMenu_AboutNotepad){editArea.requestFocus();JOptionPane.showMessageDialog(this,"&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\n"+" 编写者：沐伊科技 \n"+" 编写时间：2016-06-09                          \n"+" 更多教程：http://pan.muyi.so (网盘资源教程应有尽有哦!)     \n"+" e-mail：[e-mail]                \n"+" 一些地方借鉴他人，不足之处希望大家能提出意见，谢谢！  \n"+"&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\n","记事本",JOptionPane.INFORMATION_MESSAGE);}//关于结束}//方法actionPerformed()结束//实现DocumentListener接口中的方法(与撤销操作有关)public void removeUpdate(DocumentEvent e){editMenu_Undo.setEnabled(true);}public void insertUpdate(DocumentEvent e){editMenu_Undo.setEnabled(true);}public void changedUpdate(DocumentEvent e){editMenu_Undo.setEnabled(true);}//DocumentListener结束//实现接口UndoableEditListener的类UndoHandler(与撤销操作有关)class UndoHandler implements UndoableEditListener{public void undoableEditHappened(UndoableEditEvent uee){undo.addEdit(uee.getEdit());}}//main函数开始public static void main(String args[]){Notepad notepad=new Notepad();notepad.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//使用 System exit 方法退出应用程序}//main函数结束}

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