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Java学习笔记——文本操作(记事本实现)

12-02-17

用Java写的一个记事本的小程序,实现了新建,打开,另存为,删除,复制,剪切,粘贴,查找和替换一些菜单功能,先看效果图吧~打开文本文件下面贴上完整代码,代码里面有详细注释[html] import java.awt.FileD...

 用Java写的一个记事本的小程序,实现了新建,打开,另存为,删除,复制,剪切,粘贴,查找和替换一些菜单功能,先看效果图吧~


 打开文本文件



下面贴上完整代码,代码里面有详细注释  


[html] import java.awt.FileDialog; 
import java.awt.GridLayout; 
import java.awt.Toolkit; 
import java.awt.datatransfer.Clipboard; 
import java.awt.datatransfer.DataFlavor; 
import java.awt.datatransfer.StringSelection; 
import java.awt.datatransfer.Transferable; 
import java.awt.datatransfer.UnsupportedFlavorException; 
import java.awt.event.*; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileDescriptor; 
import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.FilenameFilter; 
import java.io.IOException; 
import java.io.PrintWriter; 
import java.io.Writer; 
 
import javax.swing.*; 
import javax.swing.event.*; 
import javax.swing.filechooser.FileNameExtensionFilter; 
import javax.swing.undo.UndoManager; 
/* 
 * 记事本----独孤我---2011年12月5日----绿岛网络办公室 
 * 转载请注明出处*  
 *  
 * */ 
 
public class Notepad extends JFrame implements ActionListener 

       /** 
     *  
     */ 
    private static final long serialVersionUID = 1L; 
    JPanel pl=new JPanel(); 
    JTextArea myarea=new JTextArea(); 
     
    //相关变量 
    int start=0;//查找开始位置 
    int end=0;//查找结束位置 
    private String filename; //打开的文件名 
    String textContent="";//编辑框中的内容 
    private Writer file_writer; 
    UndoManager undoManager = new UndoManager();//撤销管理器 
     
     public Notepad() 
     { 
        initComponment();//面板初始化 
     } 
     private void initComponment() 
     {    
         //菜单栏 
         JMenuBar mb=new JMenuBar(); 
          
         //弹出菜单 
         final JPopupMenu myPopMenu=new JPopupMenu(); 
         JMenuItem copy_pop=new JMenuItem("复制"); 
         JMenuItem cut_pop=new JMenuItem("剪切"); 
         JMenuItem paste_pop=new JMenuItem("粘贴"); 
         JMenuItem delete_pop=new JMenuItem("删除");        
         JMenuItem exit_pop=new JMenuItem("退出"); 
          
         myPopMenu.add(cut_pop); 
         myPopMenu.add(copy_pop); 
         myPopMenu.add(delete_pop); 
         myPopMenu.add(paste_pop);        
         myPopMenu.add(exit_pop); 
          
         cut_pop.addActionListener(this); 
         copy_pop.addActionListener(this); 
         delete_pop.addActionListener(this); 
         paste_pop.addActionListener(this); 
         exit_pop.addActionListener(this); 
          
          
         //菜单 
         JMenu file=new JMenu("文件"); 
         JMenu edit=new JMenu("编辑"); 
         JMenu help=new JMenu("帮助"); 
          
          
         //子菜单 
         JMenuItem newnew_file=new JMenuItem("新建"); 
         JMenuItem open=new JMenuItem("打开");          
         JMenuItem save=new JMenuItem("保存"); 
         JMenuItem save_as=new JMenuItem("另存为"); 
         JMenuItem exit=new JMenuItem("退出"); 
          
         JMenuItem search=new JMenuItem("查找和替换"); 
          
         JMenuItem copy=new JMenuItem("复制"); 
         JMenuItem cut=new JMenuItem("剪切"); 
         JMenuItem paste=new JMenuItem("粘贴"); 
         JMenuItem delete=new JMenuItem("删除"); 
          
          
         //绑定监听事件 
         new_file.addActionListener(this); 
         open.addActionListener(this); 
         save.addActionListener(this); 
         save_as.addActionListener(this); 
         exit.addActionListener(this); 
          
         
         copy.addActionListener(this); 
         cut.addActionListener(this); 
         paste.addActionListener(this); 
         delete.addActionListener(this); 
         search.addActionListener(this);          
          
          
         //将菜单和相应的子菜单添加到菜单栏 
         file.add(open); 
         file.add(new_file); 
         file.add(save); 
         file.add(save_as); 
         file.addSeparator(); 
         file.add(exit); 
          
         edit.add(copy); 
         edit.add(cut); 
         edit.add(paste); 
         edit.add(delete); 
         edit.add(search); 
          
          
          
         mb.add(file); 
         mb.add(edit); 
         mb.add(help); 
          
          
          
         //给文本区域添加滚动条 
         myarea.add(myPopMenu); 
         JScrollPane scrollpane=new JScrollPane(myarea); 
         //主窗口 
         setTitle("记事本"); 
         setSize(600,400); 
         setLocation(400,300); 
          
         setJMenuBar(mb); 
         //add("Center",myarea); 
         add(scrollpane); 
        // add(myPopMenu); 
          
         //窗口监听 
         addWindowListener(new WindowAdapter() { 
             public void windowClosing(WindowEvent evt) 
             { 
                 if(!myarea.getText().equals(textContent)) 
                    { 
                        int result=JOptionPane.showConfirmDialog(null,"文件内容已改变,确认保存退出吗?","警告",1); 
                        if(result==JOptionPane.OK_OPTION) 
                        {    
                            save(); 
                            System.exit(0); 
                        } 
                    } 
                    else 
                    System.exit(0); 
             }   
        });  
         //鼠标监听 
         myarea.addMouseListener(new MouseAdapter() { 
             public void mousePressed(MouseEvent e) 
             { 
                 int mods=e.getModifiers(); 
                //鼠标右键 
                if((mods&InputEvent.BUTTON3_MASK)!=0){ 
                //弹出菜单 
                myPopMenu.show(e.getComponent(),e.getX(),e.getY()); 
                } 
            } 
              
         }); 
     
     } 
    @Override 
    public void actionPerformed(ActionEvent e) { 
        // TODO Auto-generated method stub 
    try 
    { 
        if(e.getActionCommand()=="新建") 
        { 
            myarea.setText(""); 
        } 
        else if(e.getActionCommand()=="打开") 
        { 
            FileDialog fileDialog=new FileDialog(this,"打开文件",FileDialog.LOAD); 
            fileDialog.setFile("*.txt"); 
            fileDialog.setVisible(true); 
            if(fileDialog.getFile()!=null) 
            { 
                filename=fileDialog.getDirectory()+fileDialog.getFile();//获得文件名 
                 
                //读取文件 
                 
                  FileReader file_reader=new FileReader(filename);//此处必须要捕获异常 
                  BufferedReader br=new BufferedReader(file_reader); 
                  String temp=""; 
                  while(br.ready())//判断缓冲区是否为空,非空时返回true 
                  { 
                       int c=br.read(); 
                       temp+=(char)c; 
                  } 
                  myarea.setText(temp); 
                  br.close(); 
                  file_reader.close(); 
                  textContent=myarea.getText(); 
                  setTitle("记事本-"+filename);             
                 
            } 
        } 
        else if(e.getActionCommand()=="保存") 
        { 
            save(); 
        } 
        else if(e.getActionCommand()=="另存为") 
        { 
            FileDialog fileDialog=new FileDialog(this,"另存为",FileDialog.SAVE); 
            fileDialog.setFile("*.txt"); 
            fileDialog.setVisible(true); 
            if(fileDialog.getFile()!=null)             { 
                   
                   //File temp=new File(file.getAbsolutePath()+".txt"); 
                   //file.renameTo(temp); 
                   //写入文件 
                   FileWriter fw=new FileWriter(fileDialog.getDirectory()+fileDialog.getFile()); 
                   BufferedWriter bw=new BufferedWriter(fw); 
                   PrintWriter pw=new PrintWriter(bw);                  
                   pw.print(myarea.getText()); 
                   textContent=myarea.getText(); 
                   pw.close(); 
                   bw.close(); 
                   fw.close(); 
                    
                } 
        } 
        else if(e.getActionCommand()=="退出") 
        {    
            if(!myarea.getText().equals(textContent)) 
            { 
                int result=JOptionPane.showConfirmDialog(null,"文件内容已改变,确认保存退出吗?","警告",1); 
                if(result==JOptionPane.OK_OPTION) 
                { 
                    save(); 
                    System.exit(0); 
                } 
            } 
            else 
            System.exit(0); 
        } 
        else if(e.getActionCommand()=="查找和替换") 
        {     
            //查找对话框 
            JDialog search=new JDialog(this,"查找和替换"); 
            search.setSize(200, 100); 
            search.setLocation(450,350); 
            JLabel label_1=new JLabel("查找的内容"); 
            JLabel label_2=new JLabel("替换的内容"); 
            final JTextField textField_1=new JTextField(5); 
            final JTextField textField_2=new JTextField(5); 
            JButton buttonFind=new JButton("查找下一个"); 
            JButton buttonChange=new JButton("替换"); 
            JPanel panel=new JPanel(new GridLayout(2,3)); 
            panel.add(label_1); 
            panel.add(textField_1); 
            panel.add(buttonFind); 
            panel.add(label_2); 
            panel.add(textField_2); 
            panel.add(buttonChange); 
            search.add(panel); 
             search.setVisible(true); 
             
             
            //为查找下一个 按钮绑定监听事件 
            buttonFind.addActionListener(new ActionListener() { 
                 
                @Override 
                public void actionPerformed(ActionEvent e) { 
                    // TODO Auto-generated method stub 
                   String findText=textField_1.getText();//查找的字符串 
                    
                   String textArea=myarea.getText();//当前文本框的内容 
                   start=textArea.indexOf(findText,end); 
                   end=start+findText.length(); 
                   if(start==-1)//没有找到 
                   { 
                       JOptionPane.showMessageDialog(null,"没找到"+findText,"记事本",JOptionPane.WARNING_MESSAGE); 
                       myarea.select(start, end); 
                   } 
                   else 
                   { 
                       myarea.select(start,end); 
                   } 
                    
                } 
            }); 
            //为替换按钮绑定监听时间 
            buttonChange.addActionListener(new ActionListener() { 
                 
                @Override 
                public void actionPerformed(ActionEvent e) { 
                    // TODO Auto-generated method stub 
                    String changeText=textField_2.getText();//替换的字符串 
                    myarea.select(start, end); 
                    myarea.replaceSelection(changeText); 
                    myarea.select(start, end);                   
                } 
            });   
               
             
             
             
        } 
        else if(e.getActionCommand()=="复制") 
        { 
            copy();      
        } 
        else if(e.getActionCommand()=="粘贴") 
        {     
            paste(); 
        } 
        else if(e.getActionCommand()=="剪切") 
        { 
            cut(); 
        } 
        else if(e.getActionCommand()=="删除") 
        { 
            delete(); 
        }        
    } 
    catch(Exception ex) 
    { 
            ex.printStackTrace(); 
    } 
         
         
         
         
         
    } 
    public static void main(String[] args) 
    { 
        new Notepad().setVisible(true); 
    } 
    private void save() 
    { 
        try 
        { 
        File file=new File(filename); 
        FileWriter file_writer; 
         
        file_writer = new FileWriter(file); 
         
        BufferedWriter bw=new BufferedWriter(file_writer); 
        PrintWriter pw=new PrintWriter(bw);//如果直接向文件中输入而不是输入缓冲区,效率低下 
         
        pw.print(myarea.getText()); 
        textContent=myarea.getText(); 
        pw.close(); 
        bw.close(); 
        file_writer.close(); 
        } 
        catch(Exception e) 
        { 
            e.printStackTrace(); 
        } 
    } 
    private void cut() 
    { 
        copy(); 
        delete(); 
    } 
    private void copy() 
    { 
        if(myarea.getSelectedText()==null) 
        { 
            JOptionPane.showMessageDialog(null, "你没有选中任何文字!","记事本",JOptionPane.WARNING_MESSAGE); 
        } 
        Clipboard clipBoard= Toolkit.getDefaultToolkit().getSystemClipboard(); 
        StringSelection stringSelection=new StringSelection(myarea.getSelectedText()); 
        clipBoard.setContents(stringSelection, null); 
    } 
    private void paste() throws UnsupportedFlavorException, IOException 
    { 
        String content_copy=""; 
        //构造系统剪切板 
        Clipboard clipBoard= Toolkit.getDefaultToolkit().getSystemClipboard(); 
         
        //获取剪切板内容 
        Transferable content=clipBoard.getContents(null); 
         
        if(content!=null) 
        { 
            //检查是否是文本类型 
            if(content.isDataFlavorSupported(DataFlavor.stringFlavor)) 
            { 
                content_copy=(String) content.getTransferData(DataFlavor.stringFlavor); 
                 
                //判断文本框中有无文字选中 
                if(myarea.getSelectedText()!=null) 
                { 
                    myarea.replaceSelection(content_copy); 
                } 
                else 
                { 
                    myarea.insert(content_copy, myarea.getSelectionStart()); 
                } 
            } 
        } 
        else 
            JOptionPane.showMessageDialog(null, "系统剪贴板中无内容!","记事本",JOptionPane.WARNING_MESSAGE); 
     
         
    } 
    private void delete() 
    { 
        myarea.replaceSelection(""); 
    } 
     
     
     
       

import java.awt.FileDialog;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.undo.UndoManager;
/*
 * 记事本----独孤我---2011年12月5日----绿岛网络办公室
 * 转载请注明出处*
 *
 * */

public class Notepad extends JFrame implements ActionListener
{
       /**
  *
  */
 private static final long serialVersionUID = 1L;
 JPanel pl=new JPanel();
 JTextArea myarea=new JTextArea();
 
 //相关变量
    int start=0;//查找开始位置
    int end=0;//查找结束位置
 private String filename; //打开的文件名
 String textContent="";//编辑框中的内容
 private Writer file_writer;
 UndoManager undoManager = new UndoManager();//撤销管理器
 
     public Notepad()
     {
     initComponment();//面板初始化
     }
     private void initComponment()
     {  
      //菜单栏
      JMenuBar mb=new JMenuBar();
     
      //弹出菜单
      final JPopupMenu myPopMenu=new JPopupMenu();
      JMenuItem copy_pop=new JMenuItem("复制");
      JMenuItem cut_pop=new JMenuItem("剪切");
      JMenuItem paste_pop=new JMenuItem("粘贴");
      JMenuItem delete_pop=new JMenuItem("删除");     
      JMenuItem exit_pop=new JMenuItem("退出");
     
      myPopMenu.add(cut_pop);
      myPopMenu.add(copy_pop);
      myPopMenu.add(delete_pop);
      myPopMenu.add(paste_pop);     
      myPopMenu.add(exit_pop);
     
      cut_pop.addActionListener(this);
      copy_pop.addActionListener(this);
      delete_pop.addActionListener(this);
      paste_pop.addActionListener(this);
      exit_pop.addActionListener(this);
     
     
      //菜单
      JMenu file=new JMenu("文件");
      JMenu edit=new JMenu("编辑");
      JMenu help=new JMenu("帮助");
     
     
      //子菜单
      JMenuItem new_file=new JMenuItem("新建");
      JMenuItem open=new JMenuItem("打开");     
      JMenuItem save=new JMenuItem("保存");
      JMenuItem save_as=new JMenuItem("另存为");
      JMenuItem exit=new JMenuItem("退出");
     
      JMenuItem search=new JMenuItem("查找和替换");
     
      JMenuItem copy=new JMenuItem("复制");
      JMenuItem cut=new JMenuItem("剪切");
      JMenuItem paste=new JMenuItem("粘贴");
      JMenuItem delete=new JMenuItem("删除");
     
     
      //绑定监听事件
      new_file.addActionListener(this);
      open.addActionListener(this);
      save.addActionListener(this);
      save_as.addActionListener(this);
      exit.addActionListener(this);
     
     
      copy.addActionListener(this);
      cut.addActionListener(this);
      paste.addActionListener(this);
      delete.addActionListener(this);
      search.addActionListener(this);     
     
     
      //将菜单和相应的子菜单添加到菜单栏
      file.add(open);
      file.add(new_file);
      file.add(save);
      file.add(save_as);
      file.addSeparator();
      file.add(exit);
     
      edit.add(copy);
      edit.add(cut);
      edit.add(paste);
      edit.add(delete);
      edit.add(search);
     
     
     
      mb.add(file);
      mb.add(edit);
      mb.add(help);
     
     
     
      //给文本区域添加滚动条
      myarea.add(myPopMenu);
      JScrollPane scrollpane=new JScrollPane(myarea);
      //主窗口
      setTitle("记事本");
      setSize(600,400);
      setLocation(400,300);
     
      setJMenuBar(mb);
      //add("Center",myarea);
      add(scrollpane);
     // add(myPopMenu);
     
      //窗口监听
        addWindowListener(new WindowAdapter() {
       public void windowClosing(WindowEvent evt)
       {
        if(!myarea.getText().equals(textContent))
        {
         int result=JOptionPane.showConfirmDialog(null,"文件内容已改变,确认保存退出吗?","警告",1);
         if(result==JOptionPane.OK_OPTION)
         {  
          save();
          System.exit(0);
         }
        }
        else
        System.exit(0);
       } 
  });
        //鼠标监听
        myarea.addMouseListener(new MouseAdapter() {
       public void mousePressed(MouseEvent e)
       {
        int mods=e.getModifiers();
       //鼠标右键
       if((mods&InputEvent.BUTTON3_MASK)!=0){
       //弹出菜单
       myPopMenu.show(e.getComponent(),e.getX(),e.getY());
       }
      }
      
        });
   
     }
 @Override
 public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
 try
 {
     if(e.getActionCommand()=="新建")
     {
      myarea.setText("");
     }
  else if(e.getActionCommand()=="打开")
  {
   FileDialog fileDialog=new FileDialog(this,"打开文件",FileDialog.LOAD);
   fileDialog.setFile("*.txt");
   fileDialog.setVisible(true);
   if(fileDialog.getFile()!=null)
   {
    filename=fileDialog.getDirectory()+fileDialog.getFile();//获得文件名
    
    //读取文件
    
      FileReader file_reader=new FileReader(filename);//此处必须要捕获异常
      BufferedReader br=new BufferedReader(file_reader);
      String temp="";
      while(br.ready())//判断缓冲区是否为空,非空时返回true
      {
        int c=br.read();
        temp+=(char)c;
      }
      myarea.setText(temp);
      br.close();
      file_reader.close();
      textContent=myarea.getText();
      setTitle("记事本-"+filename);   
    
   }
  }
  else if(e.getActionCommand()=="保存")
  {
   save();
  }
  else if(e.getActionCommand()=="另存为")
  {
   FileDialog fileDialog=new FileDialog(this,"另存为",FileDialog.SAVE);
   fileDialog.setFile("*.txt");
   fileDialog.setVisible(true);
   if(fileDialog.getFile()!=null)            {
     
       //File temp=new File(file.getAbsolutePath()+".txt");
       //file.renameTo(temp);
       //写入文件
       FileWriter fw=new FileWriter(fileDialog.getDirectory()+fileDialog.getFile());
       BufferedWriter bw=new BufferedWriter(fw);
       PrintWriter pw=new PrintWriter(bw);      
       pw.print(myarea.getText());
       textContent=myarea.getText();
       pw.close();
       bw.close();
       fw.close();
      
    }
  }
  else if(e.getActionCommand()=="退出")
  {  
   if(!myarea.getText().equals(textContent))
   {
    int result=JOptionPane.showConfirmDialog(null,"文件内容已改变,确认保存退出吗?","警告",1);
    if(result==JOptionPane.OK_OPTION)
    {
           save();
     System.exit(0);
    }
   }
   else
   System.exit(0);
  }
  else if(e.getActionCommand()=="查找和替换")
  {   
   //查找对话框
   JDialog search=new JDialog(this,"查找和替换");
   search.setSize(200, 100);
   search.setLocation(450,350);
   JLabel label_1=new JLabel("查找的内容");
   JLabel label_2=new JLabel("替换的内容");
   final JTextField textField_1=new JTextField(5);
   final JTextField textField_2=new JTextField(5);
   JButton buttonFind=new JButton("查找下一个");
   JButton buttonChange=new JButton("替换");
   JPanel panel=new JPanel(new GridLayout(2,3));
   panel.add(label_1);
   panel.add(textField_1);
   panel.add(buttonFind);
   panel.add(label_2);
   panel.add(textField_2);
      panel.add(buttonChange);
   search.add(panel);
    search.setVisible(true);
   
   
   //为查找下一个 按钮绑定监听事件
   buttonFind.addActionListener(new ActionListener() {
    
    @Override
    public void actionPerformed(ActionEvent e) {
     // TODO Auto-generated method stub
       String findText=textField_1.getText();//查找的字符串
      
       String textArea=myarea.getText();//当前文本框的内容
       start=textArea.indexOf(findText,end);
       end=start+findText.length();
       if(start==-1)//没有找到
       {
        JOptionPane.showMessageDialog(null,"没找到"+findText,"记事本",JOptionPane.WARNING_MESSAGE);
        myarea.select(start, end);
       }
       else
       {
        myarea.select(start,end);
       }
      
    }
   });
   //为替换按钮绑定监听时间
      buttonChange.addActionListener(new ActionListener() {
    
    @Override
    public void actionPerformed(ActionEvent e) {
     // TODO Auto-generated method stub
     String changeText=textField_2.getText();//替换的字符串
     myarea.select(start, end);
     myarea.replaceSelection(changeText);
     myarea.select(start, end);     
    }
   }); 
    
     
   
   
  }
  else if(e.getActionCommand()=="复制")
  {
   copy();  
  }
  else if(e.getActionCommand()=="粘贴")
  {   
   paste();
  }
  else if(e.getActionCommand()=="剪切")
  {
   cut();
  }
  else if(e.getActionCommand()=="删除")
  {
   delete();
  }  
 }
 catch(Exception ex)
 {
      ex.printStackTrace();
 }
  
  
  
  
  
 }
 public static void main(String[] args)
 {
  new Notepad().setVisible(true);
 }
 private void save()
 {
  try
     {
  File file=new File(filename);
  FileWriter file_writer;
  
  file_writer = new FileWriter(file);
  
  BufferedWriter bw=new BufferedWriter(file_writer);
  PrintWriter pw=new PrintWriter(bw);//如果直接向文件中输入而不是输入缓冲区,效率低下
  
  pw.print(myarea.getText());
  textContent=myarea.getText();
  pw.close();
  bw.close();
  file_writer.close();
     }
     catch(Exception e)
     {
      e.printStackTrace();
     }
 }
 private void cut()
 {
  copy();
  delete();
 }
 private void copy()
 {
  if(myarea.getSelectedText()==null)
  {
   JOptionPane.showMessageDialog(null, "你没有选中任何文字!","记事本",JOptionPane.WARNING_MESSAGE);
  }
  Clipboard clipBoard= Toolkit.getDefaultToolkit().getSystemClipboard();
  StringSelection stringSelection=new StringSelection(myarea.getSelectedText());
  clipBoard.setContents(stringSelection, null);
 }
 private void paste() throws UnsupportedFlavorException, IOException
 {
  String content_copy="";
  //构造系统剪切板
  Clipboard clipBoard= Toolkit.getDefaultToolkit().getSystemClipboard();
  
  //获取剪切板内容
  Transferable content=clipBoard.getContents(null);
  
  if(content!=null)
  {
   //检查是否是文本类型
   if(content.isDataFlavorSupported(DataFlavor.stringFlavor))
   {
    content_copy=(String) content.getTransferData(DataFlavor.stringFlavor);
    
    //判断文本框中有无文字选中
    if(myarea.getSelectedText()!=null)
    {
     myarea.replaceSelection(content_copy);
    }
    else
    {
     myarea.insert(content_copy, myarea.getSelectionStart());
    }
   }
  }
  else
   JOptionPane.showMessageDialog(null, "系统剪贴板中无内容!","记事本",JOptionPane.WARNING_MESSAGE);
 
  
 }
 private void delete()
 {
  myarea.replaceSelection("");
 }
 
 
 
     
}
 
    [java] <span style="font-family:Arial, Verdana, sans-serif;"><span style="white-space: normal;"> 
</span></span> 

 

摘自 txg703003659的专栏



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