请教高手java问题

SunboyJohn 2011-03-19 05:18:35

/**
* @(#)EditorFrame.java
*
* EditorFrame application
*
* @author
* @version 1.00 2011/3/19
*/
import java.lang.*;
import java.awt.*;
import java.io.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
public class EditorFrame extends Frame implements ActionListenter{
TextArea textArea=new TextArea();
MenuBar menuBar=new MenuBar();

Menu fileMenu=new Menu("File");
MenuItem newItem=new MenuItem("New");
MenuItem openItem=new MenuItem("Open");
MenuItem saveItem=new MenuItem("Save");
MenuItem saveAsItem=new MenuItem("Save As");
MenuItem exitItem=new MenuItem("Exit");

Menu editMenu=new Menu("Edit");
MenuItem selectItem=new MenuItem("Select All");
MenuItem copyItem=new MenuItem("Copy");
MenuItem cutItem=new MenuItem("Cut");
MenuItem pasteItem=new MenuItem("Paste");

String fileName="NoName";
Toolkit toolKit=Toolkit.getDefaultToolkit();
Clipboard ClipBoard=toolKit.getSystemClipboard();
private FileDialog openFileDialog=new FileDialog(this,"Open File",FileDialog.LOAD);
private FileDialog saveAsFileDialog=new FileDialog(this,"Save File As",FileDialog.SAVE);
public EditorFrame(){
setTitle("私密日记本");
setFont(new Font("Times New Roman",Font.PLAIN,12));
setBackground(Color.white);
setSize(400,300);

fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(saveAsItem);
fileMenu.addSeparator();
fileMenu.add(exitItem);
editMenu.add(selectItem);
editMenu.addSeparator();
editMenu.add(copyItem);
editMenu.add(cutItem);
editMenu.add(pasteItem);
menuBar.add(fileMenu);
menuBar.add(editMenu);
setMenuBar(menuBar);
add(textArea);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
newItem.addActionListener(this);
openItem.addActionListener(this);
saveItem.addActionListener(this);
saveAsItem.addActionListener(this);
exitItem.addActionListener(this);
selectItem.addActionListener(this);
copyItem.addActionListener(this);
cutItem.addActionListener(this);
pasteItem.addActionListener(this);

}
public void actionPerformed(ActionEvent e){
Object eventSource=e.getSource();
if(eventSource==newItem){
textArea.setText("");
}
else if(eventSource==openItem){
openFileDialog.show();
fileName=openFileDialog.getDirectory()+ openFileDialog.getFile();
if(fileName!=null)
readFile(fileName);
}
else if(eventSource==saveItem){
if(fileName!=null)
writeFile(fileName);
}
else if(eventSource==saveAsItem){
saveAsFileDialog.show();
fileName=saveAsFileDialog.getDirectory()+ saveAsFileDialog.getFile();
if(fileName!=null)
writeFile(fileName);
}
else if(eventSource==copyItem){
String text=textArea.getSelectedText();
StringSelection selection=new StringSelection(text);
ClipBoard.setContents(selection,null);
}
else if(eventSource==cutItem){
String text=textArea.getSelectedText();
StringSelection selection=new StringSelection(text);
ClipBoard.setContents(selection,null);
textArea.replaceRange("",textArea.getSelectionStart(),textArea.getSelectionEnd());
}
else if(eventSource==pasteItem){
Transferable contents=ClipBoard.getContents(this);
if(contents==null)return;
String text;
text="";
try{
text=(String)contents.getTransferData(DataFlavor.stringFlavor);
}
catch(Exception exception){
}
textArea.replaceRange(text,textArea.getSelectionStart(),textArea.getSelectionEnd());
}
else if(eventSource==exitItem){
System.exit(0);
}
}
public void readFile(String fileName){
try{
File file=new File(fileName);
FileReader readln=new FileReader(file);
int size=(int)file.length();
int charsRead=0;
char[] content=new char[size];
while(readln.ready())
charsRead+=readln.read(content,charsRead,size-charsRead);
readln.close();
textArea.setText(new String(content,0,charsRead));
}
catch(Exception e){
System.out.println("Error openning file");
}
}
public void writeFile(String fileName){
try{
File file=new File(fileName);
FileWriter writeOut=new FileWriter(file);
writeOut.write(textArea.getText());
writeOut.close();
}
catch(IOException e){
System.out.println("Error writing file");
}
}
public static void main(String[] args) {
Frame frame=new EditorFrame();
frame.show();
// TODO, add your application code
System.out.println("Hello World!");
}
}请教高手,为什么运行时会出现无法将 java.awt.MenuItem 中的 addActionListener(java.awt.event.ActionListener) 应用于 (EditorFrame)

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