问题补充说明：（1） 要求如何实现记事本的打开与保存操作？ （2） 如何实现记事本的复制、剪切、粘帖操作
importjava.awt.event.ActionListener;
im编采奏影冷上容顶土解portjava.util.EventListener;
importjava.awt.event.*;
importjava.awt.*;
import***.io.*;
importjava.lang.*;
impor布州氧放航古以持tjava.awt.datatransfer.*;
importjavax.swing.*;
publicclassMiniEditextendsJFrameimplementsActionListener{
/**
*Methodmain
*
*
*@paramargs
*
*/
MenuBarmenuBar=newMenuBar();
Menufile=newMenu("File"),
edit=newMenu("Edit"),
help=newMenu("Help")劳存应征绿死展激哥范干;
MenuItem[]menuItem={
newMenuItem("New"),
newMenuItem("Open"),
n缩现ewMenuItem("Save"),
newMenuItem("Exit"),
newMenuItem("SelectAll"),
newMenuItem("Copy"),
newMenuItem("Cut"),
newM苗又敌教提把过enuItem("Pa伤燃议好钱ste"),
newMenuItem("Help")
};
TextAreatextArea=n缺析话套菜又须ewTextAre两进考何亮序万效a();
StringfileName="NoName";
ToolkittoolKit=Toolkit.getDefaultToolkit();
Clipboardclipboard=toolKit.getSystemClip独收排试board();
//opneandclosemessagedialogs
privateFileDialogopenF底述间需降鱼触操想左单ileDialog=
newFileDialog(this,"OpenFile",FileDialog.LOAD);
privateFileDialogsav他古钱满备门周皇下棉eFileDialog=
newFile欢可龙八Dialog(this,"SaveFile",***.SAVE);
publicstaticvoidmain(String[]args){
//TODO:Addyourcodehere
MiniEditMyEdit=newMiniEdit()副精发味负交型天记甚造;
***.show由称如原许台剂器练毛算();
}
/**
*MethodMiniEdit
*
*
*/
publicMiniEdit(){
//TODO:Addyourcodehere
setTitle("MiniEdit");
盐setFont(newFont("Times督格束情火NewRoman",Font.PLAIN,15));
setBackground(Color.white);
setSize(50号行0,500);
setMenuBar(menuBar);
menuBar.add(file);
menuBar.add(edit);
序menuBar.add(help);
for(inti=0;i<4;i++)
{
file.add(menuItem[i]);
edit.add(menuItem[i+4]);
}
help.add(menuItem[8]);
add(textArea);
addWindowListener(newWindowAdapter(){
publicvoidwindowClosing(WindowEvente){
e.getWindow().dispose();
System.exit(0);
}
});
//addactionListener
for(inti=0;i<menuItem.length;i++)
{
menuItem[i].addActionListener(this);
}
}
/**
*MethodactionPerformed
*
*
*@parame
*
*/
publicvoidactionPerformed(ActionEvente){
//TODO:Addyourcodehere
ObjecteventSource=e.getSource();
if(eventSource==menuItem[0])//newItem
{
textArea.setText("");
}
elseif(eventSource==menuItem[1])//OpenItem
{
***.show();
fileName=openFileDialog.getDirectory()+openFileDialog.getFile();
if(fileName!=null)
{
openFile(fileName);
}
}
elseif(eventSource==menuItem[2])//SaveItem
{
***.show();
fileName=saveFileDialog.getDirectory()+saveFileDialog.getFile();
if(fileName!=null)
{
writeFile(fileName);
}
}
elseif(eventSource==menuItem[3])//exitItem
{
System.exit(0);
}
elseif(eventSource==menuItem[4])//SelectAll
{
textArea.selectAll();
}
elseif(eventSource==menuItem[5])//copy
{
Stringtext=textArea.getSelectedText();
StringSelectionselection=newStringSelection(text);
clipboard.setContents(selection,null);
}
elseif(eventSource==menuItem[6])//cut
{
Stringtext=textArea.getSelectedText();
StringSelectionselection=newStringSelection(text);
clipboard.setContents(selection,null);
textArea.replaceText("",textArea.getSelectionStart(),
textArea.getSelectionEnd());
}
elseif(eventSource==menuItem[7])//Paste
{
Transferablecontents=clipboard.getContents(this);
if(contents==null)
return;
Stringtext;
text="";
try{
text=(String)contents.getTransferData(DataFlavor.stringFlavor);
}catch(Exceptionex){}
textArea.replaceText(text,
textArea.getSelectionStart(),textArea.getSelectionEnd());
}
elseif(eventSource==menuItem[8])
{
//JOptionPane.showMessageDialog(null,"ThisisaMiniEdit.");
}
}
//Readfile
publicvoidopenFile(StringfileName){
try{
Filefile=newFile(fileName);
FileReaderreadIn=newFileReader(file);
intsize=(int)file.length();
intcharsRead=0;
char[]content=newchar[size];
while(***.ready())
charsRead+=***.read(content,charsRead,size-charsRead);
readIn.close();
textArea.setText(newString(content,0,charsRead));
}catch(Exceptione)
{
System.out.println("Erroropeningfile!");
}
}
//writefile
publicvoidwriteFile(StringfileName){
try{
Filefile=newFile(fileName);
FileWriterwrite=newFileWriter(file);
write.write(textArea.getText());
write.close();
}catch(Exceptione){
System.out.println("Errorclosingfile!");
就这样交，不会错的
