Swing JRadioButtonMenuItem类

JRadioButtonMenuItem类表示可以包含在菜单中的复选框。选中菜单中的复选框可将控件的状态从打开更改为关闭或从关闭更改为打开。

类声明

以下是javax.swing.JRadioButtonMenuItem类的声明 -

public class JRadioButtonMenuItem
   extends JMenuItem
      implements Accessible

类构造函数

类方法

方法继承

该类继承以下类中的方法 -

• javax.swing.JMenuItem
• javax.swing.JAbstractButton
• javax.swing.JComponent
• java.awt.Container
• java.awt.Component
• java.lang.Object

JRadioButtonMenuItem示例

使用编辑器创建以下Java程序：JRadioButtonMenuItemDemo.java

package com.zaixian.menu;


// 
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class JRadioButtonMenuItemDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel; 

   public JRadioButtonMenuItemDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
       JRadioButtonMenuItemDemo swingMenuDemo = new JRadioButtonMenuItemDemo();     
      swingMenuDemo.showMenuDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING JRadioButtonMenuItemDemo(xuhuhu.com)");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showMenuDemo(){
      //create a menu bar
      final JMenuBar menuBar = new JMenuBar();

      //create menus
      JMenu fileMenu = new JMenu("文件");
      JMenu editMenu = new JMenu("编辑"); 
      final JMenu aboutMenu = new JMenu("关于");
      final JMenu linkMenu = new JMenu("链接");

      //create menu items
      JMenuItem newMenuItem = new JMenuItem("新建");
      newMenuItem.setMnemonic(KeyEvent.VK_N);
      newMenuItem.setActionCommand("New");

      JMenuItem openMenuItem = new JMenuItem("打开");
      openMenuItem.setActionCommand("Open");

      JMenuItem saveMenuItem = new JMenuItem("保存");
      saveMenuItem.setActionCommand("Save");

      JMenuItem exitMenuItem = new JMenuItem("退出");
      exitMenuItem.setActionCommand("Exit");

      JMenuItem cutMenuItem = new JMenuItem("剪切");
      cutMenuItem.setActionCommand("Cut");

      JMenuItem copyMenuItem = new JMenuItem("复制");
      copyMenuItem.setActionCommand("Copy");

      JMenuItem pasteMenuItem = new JMenuItem("粘贴");
      pasteMenuItem.setActionCommand("Paste");

      MenuItemListener menuItemListener = new MenuItemListener();

      newMenuItem.addActionListener(menuItemListener);
      openMenuItem.addActionListener(menuItemListener);
      saveMenuItem.addActionListener(menuItemListener);
      exitMenuItem.addActionListener(menuItemListener);
      cutMenuItem.addActionListener(menuItemListener);
      copyMenuItem.addActionListener(menuItemListener);
      pasteMenuItem.addActionListener(menuItemListener);
      final JCheckBoxMenuItem showWindowMenu = new JCheckBoxMenuItem("显示关于", true);

      showWindowMenu.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {

            if(showWindowMenu.getState()){
               menuBar.add(aboutMenu);
            } else {
               menuBar.remove(aboutMenu);
            }
         }
      });
      final JRadioButtonMenuItem showLinksMenu = new JRadioButtonMenuItem(
         "显示链接", true);

      showLinksMenu.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {

            if(menuBar.getMenu(3)!= null){
               menuBar.remove(linkMenu);
               mainFrame.repaint();
            } else {                   
               menuBar.add(linkMenu);
               mainFrame.repaint();
            }
         }
      });
      //add menu items to menus
      fileMenu.add(newMenuItem);
      fileMenu.add(openMenuItem);
      fileMenu.add(saveMenuItem);
      fileMenu.addSeparator();
      fileMenu.add(showWindowMenu);
      fileMenu.addSeparator();
      fileMenu.add(showLinksMenu);       
      fileMenu.addSeparator();
      fileMenu.add(exitMenuItem);        

      editMenu.add(cutMenuItem);
      editMenu.add(copyMenuItem);
      editMenu.add(pasteMenuItem);

      //add menu to menubar
      menuBar.add(fileMenu);
      menuBar.add(editMenu);
      menuBar.add(aboutMenu);       
      menuBar.add(linkMenu);

      //add menubar to the frame
      mainFrame.setJMenuBar(menuBar);
      mainFrame.setVisible(true);     
   }
   class MenuItemListener implements ActionListener {
      public void actionPerformed(ActionEvent e) {            
         statusLabel.setText(e.getActionCommand() + " JMenuItem clicked.");
      }    
   }
}

执行上面示例代码，得到以下结果：