e5_17.java

java 初学者学习实例

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
class Menuwindow extends Frame implements ActionListener
{
  MenuBar menubar;Menu menu1,menu2,item6;
  MenuItem item1,item2,item3,item4,item5,item11,item22;
  TextArea text;	
  Menuwindow(String s,int a,int b)
  {
    super(s);
    menubar = new MenuBar();
    menu1 = new Menu("文件");
    menu2 = new Menu("编辑");
    item6 = new Menu("其它");
    item1 = new MenuItem("新建");
    item2 = new MenuItem("保存");
    item3 = new MenuItem("退出");
    item4 = new MenuItem("复制");
    item5 = new MenuItem("全选");
    item11 = new MenuItem("aa");
    item22 = new MenuItem("bb");
    //item6 = new MenuItem("粘贴");
    text = new TextArea();
    setLayout(new GridLayout(1,1));
    setBackground(Color.white);
    setVisible(true);
    menu1.add(item1);menu1.add(item2);menu1.addSeparator();menu1.add(item3);
    menu2.add(item4);menu2.add(item5);menu2.add(item6);
    item6.add(item11);
    item6.add(item22);
    menubar.add(menu1);menubar.add(menu2);
    setMenuBar(menubar);
    add(text);
    pack();
    item1.addActionListener(this);
    item2.addActionListener(this);
    item3.addActionListener(this);
    item4.addActionListener(this);
    item5.addActionListener(this);
    item6.addActionListener(this);
    addWindowListener(new WindowAdapter()
    {
    	public void windowClosing(WindowEvent e)
    	{
    		setVisible(false);System.exit(0);
    	}
    });

  }
  public void actionPerformed(ActionEvent e)
  {
  	if(e.getSource() == item1) text.setText(item1.getLabel());
  	else if(e.getSource() == item2) text.setText(item2.getLabel());
  	else if(e.getSource() == item3) System.exit(0);
  	else if(e.getSource() == item4) text.setText(item4.getLabel());
  	else if(e.getSource() == item5) text.setText(item5.getLabel());
  	else if(e.getSource() == item6) text.setText(item6.getLabel());
  }

}
public class E5_17 extends Applet  implements ActionListener
{
	Menuwindow window;
	Button button1,button2;
    public void init()
    {
    	button1 = new Button("开窗");
    	button2 = new Button("关窗");
    	window = new Menuwindow("家园",60,60);
    	button1.addActionListener(this);
    	button2.addActionListener(this);
    	add(button1);add(button2);
    }
    public void actionPerformed(ActionEvent e)
    {
    	if(e.getSource() == button1) window.setVisible(true);
    	else if(e.getSource() == button2) window.setVisible(false);
    }
}