窗体菜单栏的创建与使用

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;

import javax.swing.JCheckBoxMenuItem;

import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JRadioButtonMenuItem;

import javax.swing.JSeparator;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.border.EmptyBorder;

import com.sun.java.swing.plaf.windows.WindowsLookAndFeel;

import javax.swing.ImageIcon;

public class MyFrame extends JFrame {

private JPanel contentPane;

/**

* Launch the application.

*/

public static
void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public
void run() {

try {

MyFrame frame = new MyFrame();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public MyFrame() {

//设定成 Windows 样式的 LookAndFeel

try {

UIManager.setLookAndFeel(new WindowsLookAndFeel());

} catch (UnsupportedLookAndFeelException e) {

e.printStackTrace();

}

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

//创建一个 JMenuBar

JMenuBar menuBar = new JMenuBar();

//将这个 JMenuBar 设定为当前窗体的菜单栏

setJMenuBar(menuBar);

JMenu mnFile = new JMenu("File");

menuBar.add(mnFile);

JMenuItem mntmOpen = new JMenuItem("Open");

mntmOpen.setIcon(new ImageIcon(MyFrame.class.getResource("/javax/swing/plaf/metal/icons/ocean/directory.gif")));

mnFile.add(mntmOpen);

JMenuItem mntmClose = new JMenuItem("Close");

mntmClose.setIcon(new ImageIcon(MyFrame.class.getResource("/javax/swing/plaf/metal/icons/ocean/close.gif")));

//对菜单项：Close 添加 actionPerformed 事件

//点击 Close 关闭程序（注意：添加鼠标点击事件无效）

mntmClose.addActionListener(new ActionListener() {

public
void actionPerformed(ActionEvent e) {

System.exit(0);

}

});

mnFile.add(mntmClose);

JMenu mnEdit = new JMenu("Edit");

menuBar.add(mnEdit);

JMenuItem mntmUndo = new JMenuItem("Undo");

mnEdit.add(mntmUndo);

JMenuItem mntmRedo = new JMenuItem("Redo");

mnEdit.add(mntmRedo);

JMenu mnColor = new JMenu("Color");

mnEdit.add(mnColor);

JMenuItem mntmRed = new JMenuItem("Red");

mnColor.add(mntmRed);

JMenuItem mntmGreen = new JMenuItem("Green");

mnColor.add(mntmGreen);

JMenuItem mntmBlue = new JMenuItem("Blue");

mnColor.add(mntmBlue);

JMenu mnHelp = new JMenu("Help");

menuBar.add(mnHelp);

JCheckBoxMenuItem chckbxmntmC1 = new JCheckBoxMenuItem("C1");

chckbxmntmC1.setSelected(true);

mnHelp.add(chckbxmntmC1);

JCheckBoxMenuItem chckbxmntmC2 = new JCheckBoxMenuItem("C2");

//对菜单项：C2 添加 actionPerformed 事件

chckbxmntmC2.addActionListener(new ActionListener() {

public
void actionPerformed(ActionEvent e) {

//输出该选项是否被选中

System.out.println(chckbxmntmC2.getState());

}

});

mnHelp.add(chckbxmntmC2);

JCheckBoxMenuItem chckbxmntmC3 = new JCheckBoxMenuItem("C3");

chckbxmntmC3.setSelected(true);

mnHelp.add(chckbxmntmC3);

//分隔线，可以使用代码实现，

//也可以使用控件（组件） JSeparator 拖动实现

JSeparator separator = new JSeparator();

mnHelp.add(separator);

JRadioButtonMenuItem rdbtnmntmR1 = new JRadioButtonMenuItem("R1");

mnHelp.add(rdbtnmntmR1);

JRadioButtonMenuItem rdbtnmntmR2 = new JRadioButtonMenuItem("R2");

rdbtnmntmR2.setSelected(true);

mnHelp.add(rdbtnmntmR2);

JRadioButtonMenuItem rdbtnmntmR3 = new JRadioButtonMenuItem("R3");

mnHelp.add(rdbtnmntmR3);

ButtonGroup group=new ButtonGroup();

group.add(rdbtnmntmR1);

group.add(rdbtnmntmR2);

group.add(rdbtnmntmR3);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(new BorderLayout(0, 0));

}

}