usemenu.java

这是一个用Java语言编的一个小程序

import java.awt.*;
import java.awt.event.*;


public class UseMenu
{
   public static void main(String args[])
   {
     Frame1 mf=new Frame1();
     mf.setSize(new Dimension(300,200));
     mf.setVisible(true);
   }
}
class Frame1 extends Frame implements ActionListener,ItemListener
{
    MenuBar m_MenuBar;
    Menu menuFile,menuEdit,m_Edit_paste;
    MenuItem mi_File_Open,mi_File_Close,mi_File_Exit,mi_Edit_Copy;
    MenuItem pi_New,pi_Del,mi_Paste_All,mi_Paste_Part;
    CheckboxMenuItem mi_Edit_Cut;
    PopupMenu popM;
    TextArea ta;
    Frame1()
    {
       super("拥有菜单的窗口");
       ta=new TextArea("\n\n\n\n\n\t\t\t没有选择",5,20);
       ta.addMouseListener(new HandleMouse(this));
       add("Center",ta);
       popM=new PopupMenu();
       pi_New=new MenuItem(" 新建 ");
       pi_New.addActionListener(this);
       popM.add(pi_New);
       pi_Del=new MenuItem(" 删除 ");
       pi_Del.addActionListener(this);
       popM.add(pi_Del);
       pi_Pro=new MenuItem(" 属性 ");
       pi_Pro.addActionListener(this);
       popM.add(pi_Pro);
       ta.add(popM);
       m_MenuBar=new MenuBar();
       menuFile=new Menu("文件");
       MenuItem mi_File_Open=new MenuItem("打开",new MenuShortcut('o'));
       MenuItem mi_File_Close=new MenuItem("关闭",new MenuShortcut('c'));
       MenuItem mi_File_Exit=new MenuItem("退出",new MenuShortcut('x'));
       mi_File_Open.setActionCommand("打开");
       mi_File_Close.setActionCommand("关闭");
       mi_File_Exit.setActionCommand("退出");
       mi_File_Open.addActionListener(this);
       mi_File_Close.addActionListener(this);
       mi_File_Exit.addActionListener(this);
       menuFile.add(mi_File_Open);
       menuFile.add(mi_File_Close);
       menuFile.addSeparator();
       menuFile.add(mi_File_Exit);
       m_MenuBar.add(menuFile);

       menuEdit=new Menu("编辑");
       mi_Edit_Copy=new MenuItem("复制");
       mi_Edit_Cut=new CheckboxMenuItem("剪切");
       mi_Edit_Paste=new Menu("粘贴");
       mi_Paste_All=new MenuItem("全部粘贴");
       mi_Paste_Part=new MenuItem("部分粘贴");
       mi_Edit_Copy.addActionListener(this);
       mi_Edit_Cut.addItemListener(this);
       m_Edit_Paste.add(mi_Paste_All);
       m_Edit_Paste.add(mi_Paste_Part);
       mi_Paste_All.addActionListener(this);
       mi_Paste_Part.addActionListener(this);
       menuEdit.add(mi_Edit_Copy);
       menuEdit.add(mi_Edit_Cut);
       menuEdit.addSeparator();
       m_MenuBar.add(menuEdit);
       this.setMenuBar(m_MenuBar);
    }
    public void actionPerformed(ActionEvent e)
    {
       if(e.getActionCommand()=="退出")
       {
           dispose();
           System.exit(0);
       }
       else
            ta.setText("\n\n\n\n\n\t\t\t"+e.getActionCommand());
     }
     public void itemStateChanged(ItemEvent e)
     {
        if(e.getSource()==mi_Edit_Cut)
           if(((CheckboxMenuItem)e.getSource()).getState())
               ta.setText("\n\n\n\n\n\t\t\t"+"选择了"+((CheckboxMenuItem)e.getSource()).getLabel());
            else
                ta.setText("\n\n\n\n\n\t\t\t"+"未选择"+((CheckboxMenuItem)e.getSource()).getLabel());
     }
}

class HandleMouse extends MouseAdapter
{
     Frame1 m_Parent;
     
     HandleMouse(Frame1 mf)
     {
        m_Parent=mf;
      }
     public void mouseReleased(MouseEvent e)
     {
        if(e.isPopupTrigger())
              m_Parent.popM.show((Component)e.getSource(),e.getX(),e.getY());
     }
}