ex912.txt

来自「JAVA 基础例题包含了JAVA常见的问题和常见的习题」· 文本 代码 · 共 59 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.ImageIcon;
import javax.swing.*;
public class Frame1 extends JFrame implements ActionListener,ItemListener
{	ImageIcon icon=new ImageIcon("ms.jpg");
	JTextField msg=new JTextField();
	JMenuBar mb=new JMenuBar();
	JMenu m1=new JMenu("File");
	JMenu m2=new JMenu("二级菜单");
	JMenuItem item=new JMenuItem("普通菜单项");
	JCheckBoxMenuItem checkbox=new JCheckBoxMenuItem("复选菜单项");
	JMenuItem exit=new JMenuItem("退出");
    	public Frame1()
	{	setIconImage(icon.getImage()); 	
		addWindowListener(new WindowAdapter()
				{	public void windowClosing(WindowEvent e)
					{	System.exit(0);
          		}
     			});
		Container c=getContentPane();
 		setTitle("菜单综合应用");
		setSize(350,200);
 		c.add(msg);
 		mb.add(m1);
		m1.add(m2);
		checkbox.setState(true);
		m1.add(item);
        	m1.setMnemonic('F');     //用此方法来设置JMenu和JMenuItem的快捷键
       		item.setAccelerator(KeyStroke.getKeyStroke('I',java.awt.Event.CTRL_MASK,false));
		m1.add(checkbox);
		m1.addSeparator();
		m1.add(exit);
		m2.add("菜单项A");
        	m2.add("菜单项B");
		item.addActionListener(this);
		checkbox.addItemListener(this);
		exit.addActionListener(this);
		setJMenuBar(mb);
		show();
	}
	public void actionPerformed(ActionEvent e)
	{	if(e.getSource()==exit)
   			System.exit(0);
		else
   			msg.setText(e.getActionCommand()+"被打开");
		}
		public void itemStateChanged(ItemEvent e)
		{	if(e.getSource()==checkbox)
		   	if(checkbox.getState())
     				msg.setText(checkbox.getText()+"被选中");
   	   		else
     				msg.setText(checkbox.getText()+"被取消");
		}
		public static void main(String arg[])
		{	new Frame1();
		}
}