jmenudemo.java

Swing入门必看 Swing Demo

package components;

import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;

public class JMenuDemo extends JFrame {



	private static final long serialVersionUID = 1L;
	private static int count = 0;

	public JMenuDemo() {
		final JLabel label = new JLabel("Message");
		JMenuBar menuBar = new JMenuBar();
		JMenu fileMenu = new JMenu("file");
		fileMenu.add("Open");
		JMenuItem editMenuItem = new JMenuItem("Edit");
		editMenuItem.setMnemonic('a');
		editMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK, true));
		editMenuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				label.setText("OK" + count++);
			}
		});
		fileMenu.add(editMenuItem);
		fileMenu.addSeparator();
//		fileMenu.add(label);
		
		menuBar.add(fileMenu);
		
		JMenu colorMenu = new JMenu("Color");
		final JRadioButtonMenuItem red = new JRadioButtonMenuItem("red");
		red.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent e) {
				if(e.getSource() == red) {
					label.setBackground(Color.red);
					
				}
			}
		});
		colorMenu.add(red);
		menuBar.add(colorMenu);

		menuBar.add(label);
		
		fileMenu.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				label.setBackground(Color.red);
			}
		});
		
		
		
		setJMenuBar(menuBar);
		
		
		
		Container container = getContentPane();
		container.setLayout(new FlowLayout());
//		container.add(label);
		container.setBackground(Color.RED);
		setSize(400,400);
		setVisible(true);
		
	}
	public static void main(String[] args) {
		JMenuDemo application = new JMenuDemo();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}