jmenudemo.java

这是一个用java编写的菜单演示程序

import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;


public class JMenuDemo extends JFrame{

	/**
	 * @param args
	 */
	private JTextArea editor;
	private JMenuBar menuBar;
	private JMenu fileMenu,editMenu,helpMenu,helpsubjectMenu;
	private JMenuItem fileMenuLoad,fileMenuSave,fileMeneExit;
	public JMenuDemo()
	{
		super("Menu Column");
		setSize(400,300);
		Container container=getContentPane();
		menuBar=new JMenuBar();
		menuBar.setBackground(Color.cyan);
		addFileMenu();
		//addEditMenu();
		//addHelpMenu();
		setJMenuBar(menuBar);
		editor=new JTextArea();
		container.add(new JScrollPane(editor));
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	private void addFileMenu()
	{
		fileMenu=new JMenu("file(F)");
		fileMenu.setBackground(Color.cyan);
		
		fileMenuLoad=new JMenuItem("open(o)");
		fileMenuLoad.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{loadFile();}
		});
		fileMenu.add(fileMenuLoad);
		menuBar.add(fileMenu);
	}
	
	private void loadFile()
	{
		JFileChooser fc=new JFileChooser();
		int returnVal=fc.showOpenDialog(this);
		if(returnVal==JFileChooser.APPROVE_OPTION)
		{
			File file=fc.getSelectedFile();
			try
			{
				editor.read(new FileReader(file), null);
			}catch(IOException exp){}
		}
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JMenuDemo application=new JMenuDemo();
	}

}