10例子23.txt

来自「这是一本java基础教程 对新手上路有很大帮助」· 文本 代码 · 共 45 行

import javax.swing.*; 
import java.awt.event.*;
import java.awt.*;
public class Example10_23{
    public static void main(String args[]){
        new JPopupMenuWindow();
    }
}
class JPopupMenuWindow extends JFrame implements ActionListener{
    JPopupMenu menu;
    JMenuItem itemCopy,itemCut,itemPaste; 
    JTextArea text;
    JPopupMenuWindow(){
       menu=new JPopupMenu();   
       itemCopy=new JMenuItem("复制");
       itemCut=new JMenuItem("剪切");
       itemPaste=new JMenuItem("粘贴");
       menu.add(itemCopy);
       menu.add(itemCut);
       menu.add(itemPaste);
       text=new JTextArea();
       text.addMouseListener(new MouseAdapter(){
                                 public void mousePressed(MouseEvent e){
                                   if(e.getModifiers()==InputEvent.BUTTON3_MASK)
                                      menu.show(text,e.getX(),e.getY());
                                 }
                          });
       add(new JScrollPane(text),BorderLayout.CENTER);
       itemCopy.addActionListener(this);
       itemCut.addActionListener(this);
       itemPaste.addActionListener(this);
       setBounds(120,100,220,220);
       setVisible(true);
       setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
    } 
    public void actionPerformed(ActionEvent e){
       if(e.getSource()==itemCopy)
           text.copy();
       else if(e.getSource()==itemCut)
           text.cut();
       else if(e.getSource()==itemPaste)
           text.paste();
    }
}