menudemo.java

学习参考,java基本语法练习,包括一些常用的技巧

//菜单应用演示
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MenuDemo extends JFrame implements ActionListener
{
	JMenuBar mbMain;
	JMenu mnuSystem,mnuHelp;
	JMenuItem mnuiCls,mnuiSave,mnuiClock,mnuiExit,mnuiContent,mnuiIndex,mnuiAbout;
	public MenuDemo()
	{
	    super("菜单应用演示");
	    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   	    Font fntDisp1=new Font("宋体",Font.PLAIN,12);
	    mbMain=new JMenuBar();
	    mnuSystem=new JMenu("系统(S)");
	    mnuHelp=new JMenu("帮助(H)");
	    mnuSystem.setMnemonic('S');
	    mnuHelp.setMnemonic(KeyEvent.VK_H);
		mbMain.add(mnuSystem);
		mbMain.add(mnuHelp);
		mnuiCls=new JMenuItem("清除屏幕显示");
		mnuiSave=new JMenuItem("保存聊天记录");
		mnuiClock=new JMenuItem("查看时间");
		mnuiExit=new JMenuItem("退出系统");
		mnuiExit.addActionListener(this);
		mnuSystem.add(mnuiCls);
		mnuSystem.add(mnuiSave);
		mnuSystem.add(mnuiClock);
		mnuSystem.add(mnuiExit);
	    mnuSystem.setFont(fntDisp1);		
	    mnuHelp.setFont(fntDisp1);		
		mnuiCls.setFont(fntDisp1);		
		mnuiSave.setFont(fntDisp1);
		mnuiClock.setFont(fntDisp1);
		mnuiExit.setFont(fntDisp1);
		Icon icnContent=new ImageIcon("help.gif");
		mnuiContent=new JMenuItem("目录",icnContent);
		mnuiIndex=new JMenuItem("索引");
		mnuiAbout=new JMenuItem("关于[HappyChat聊天系统]...");
		mnuiAbout.addActionListener(this);
		mnuiContent.setFont(fntDisp1);
		mnuiIndex.setFont(fntDisp1);		
		mnuiAbout.setFont(fntDisp1);
		mnuHelp.add(mnuiContent);
		mnuHelp.add(mnuiIndex);
		mnuHelp.add(mnuiAbout);
		setJMenuBar(mbMain);
		setSize(250,150);
		setVisible(true);
	} 
	public void actionPerformed(ActionEvent ae)
	{
		JOptionPane.showMessageDialog(null,"您选择了:"+ae.getActionCommand());
		if (ae.getSource()==mnuiExit)
			System.exit(0);
	}
    public static void main(String args[])
    {
    	new MenuDemo();
    }
    	
}