Swing JRadioButtonMenuItem類

JRadioButtonMenuItem類表示可以包含在菜單中的複選框。選中菜單中的複選框可將控件的狀態從打開更改為關閉或從關閉更改為打開。

類聲明

以下是javax.swing.JRadioButtonMenuItem類的聲明 -

public class JRadioButtonMenuItem
   extends JMenuItem
      implements Accessible

類構造函數

類方法

方法繼承

該類繼承以下類中的方法 -

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

JRadioButtonMenuItem示例

使用編輯器創建以下Java程式：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("檔");
      JMenu editMenu = new JMenu("編輯");
      final JMenu aboutMenu = new JMenu("關於");
      final JMenu linkMenu = new JMenu("鏈接");

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

      JMenuItem openMenuItem = new JMenuItem("打開");
      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("複製");
      copyMenuItem.setActionCommand("Copy");

      JMenuItem pasteMenuItem = new JMenuItem("粘貼");
      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("顯示關於", 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(
         "顯示鏈接", 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.");
      }
   }
}

執行上面示例代碼，得到以下結果：