求java记事本源码 非常急 哪位高手快给哪位高手分

import java.awt.event.ActionListener;import java.util.EventListener;import java.awt.event.*;import java.awt.*;import java.io.*;import java.lang.*;import java.awt.datatransfer.*;import javax.swing.*;public class MiniEdit extends JFrame implements ActionListener {  /**  * Method main  *  *  * @param args  *  */  MenuBar menuBar = new MenuBar();  Menu file = new Menu("File"),       edit = new Menu("Edit"),       help = new Menu("Help");    MenuItem[] menuItem ={   new MenuItem("New"),   new MenuItem("Open"),   new MenuItem("Save"),   new MenuItem("Exit"),   new MenuItem("Select All"),   new MenuItem("Copy"),   new MenuItem("Cut"),   new MenuItem("Paste"),   new MenuItem("Help")   };   TextArea textArea = new TextArea();  String fileName = "NoName";  Toolkit toolKit = Toolkit.getDefaultToolkit();  Clipboard clipboard = toolKit.getSystemClipboard();    //opne and close message dialogs  private FileDialog openFileDialog =      new FileDialog(this,"Open File",FileDialog.LOAD);  private FileDialog saveFileDialog =     new FileDialog(this,"Save File",FileDialog.SAVE);      public static void main(String[] args) {  // TODO: Add your code here  MiniEdit MyEdit = new MiniEdit();  MyEdit.show(); } /**  * Method MiniEdit  *  *  */ public MiniEdit() {  // TODO: Add your code here  setTitle("MiniEdit");  setFont(new Font("Times New Roman",Font.PLAIN,15));  setBackground(Color.white);  setSize(500,500);    setMenuBar(menuBar);  menuBar.add(file);  menuBar.add(edit);  menuBar.add(help);  for(int i=0;i<4;i++)  {   file.add(menuItem[i]);   edit.add(menuItem[i+4]);   }  help.add(menuItem[8]);     add(textArea);          addWindowListener(new WindowAdapter(){      public void windowClosing(WindowEvent e){       e.getWindow().dispose();       System.exit(0);       }      });           //add actionListener     for(int i=0;i<menuItem.length;i++)     {      menuItem[i].addActionListener(this);      }      } /**  * Method actionPerformed  *  *  * @param e  *  */ public void actionPerformed(ActionEvent e) {  // TODO: Add your code here  Object eventSource = e.getSource();    if(eventSource == menuItem[0])//newItem  {   textArea.setText("");   }   else if(eventSource == menuItem[1])//OpenItem  {   openFileDialog.show();   fileName = openFileDialog.getDirectory()+openFileDialog.getFile();   if(fileName != null)   {    openFile(fileName);    }  }    else if(eventSource ==menuItem[2])//SaveItem  {   saveFileDialog.show();   fileName = saveFileDialog.getDirectory()+saveFileDialog.getFile();   if(fileName !=null)   {    writeFile(fileName);    }   }    else if(eventSource==menuItem[3])//exitItem  {   System.exit(0);   }    else if(eventSource == menuItem[4])//Select All  {   textArea.selectAll();   }     else if(eventSource == menuItem[5])//copy     {      String text = textArea.getSelectedText();      StringSelection selection= new StringSelection(text);            clipboard.setContents(selection,null);            }       else if(eventSource == menuItem[6])//cut  {   String text = textArea.getSelectedText();   StringSelection selection = new StringSelection(text);      clipboard.setContents(selection,null);   textArea.replaceText("",textArea.getSelectionStart(),       textArea.getSelectionEnd());  }          else if(eventSource == menuItem[7])//Paste     {      Transferable contents = clipboard.getContents(this);      if(contents==null)      return;      String text;      text="";      try{       text = (String)contents.getTransferData(DataFlavor.stringFlavor);              }catch(Exception ex){}      textArea.replaceText(text,         textArea.getSelectionStart(),textArea.getSelectionEnd());        }     else if(eventSource == menuItem[8])     {     // JOptionPane.showMessageDialog(null,"This is a MiniEdit.");      }    }   //Read file public void openFile(String fileName){  try{   File file = new File(fileName);   FileReader readIn = new FileReader(file);   int size = (int)file.length();   int charsRead = 0;   char[] content = new char[size];   while(readIn.ready())      charsRead += readIn.read(content,charsRead,size-charsRead);   readIn.close();   textArea.setText(new String(content,0,charsRead));   }catch(Exception e)   {    System.out.println("Error opening file!");    }  }   //write file public void writeFile(String fileName){  try{   File file = new File(fileName);   FileWriter write = new FileWriter(file);   write.write(textArea.getText());   write.close();   }catch(Exception e){    System.out.println("Error closing file!");   } }}