Class JRadioButtonMenuItem

[Sonam Goenka]

Hi All,

I am beginner in the field of java programming. Java comprises lots of new inbuilt classes as compare to the any other programming language. But classes are very tough to understand. I am getting trouble while understanding the 'RadioButtonMenuItem' class of the java language. I don't know anything about use of this java class. I have referred many java books, but nothing was helpful. If you posses the knowledge about 'RadioButtonMenuItem class', please let know the same. I am waiting for your reply

[opaper]

A JRadioButtonMenuItem is a menu item that is part of a group of menu items in which only one item in the group can be selected. The selected item displays its selected state. Selecting it causes any other selected item to switch to the unselected state. To control the selected state of a group of radio button menu items, use a ButtonGroup object. Menu items can be configured, and to some degree controlled, by Actions. Using an Action with a menu item has many benefits beyond directly configuring a menu item.

[MindSpace]

Hello friend,

Please review below example of JRadioButtonMenuItem class:

import javax.swing.JRadioButtonMenuItem;

public class JRdButtonMenuItemDM {
  public static void main(String args[]) {
    JFrame fj = new JFrame("JRadioButtonMenuItem Sample");
    fj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar bar1 = new JMenuBar();
    JMenu menu1 = new JMenu("Options");
    menu1.setMnemonic(KeyEvent.VK_O);
    ButtonGroup group1 = new ButtonGroup();
    JRadioButtonMenuItem menuItem1 = new JRadioButtonMenuItem("A");
    group1.add(menuItem);
    menu1.add(menuItem);
    menuItem1 = new JRadioButtonMenuItem("B");
    group1.add(menuItem);
    menu1.add(menuItem);
    menuItem1 = new JRadioButtonMenuItem("C");
    group1.add(menuItem);
    menu1.add(menuItem);
    bar1.add(menu);
    fj.setJMenuBar(bar);
    fj.setSize(400, 200);
    fj.setVisible(true);
  }
}

[Modifier]

Hi,

If you want to know the constructors of 'JRadioButtonMenuItem' class then please refer following constructors:

1. JRadioButtonMenuItem(String txt, Icon icn, boolean bln)
2. JRadioButtonMenuItem(String txt, Icon icn)
3. JRadioButtonMenuItem(String txt, boolean bln)
4. JRadioButtonMenuItem(String txt)
5. JRadioButtonMenuItem(Icon icn, boolean bln)

[Katty]

Hi friend,

Following example of java will demonstrate you the implementation of the 'JRadioButtonMenuItem' class:

import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;

public class JMenuItemDemo {
  public static void main(final String args[]) {

    JFrame NW = new JFrame("MenuSample Example");
    NW.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar MBL = new JMenuBar();

    JMenu FMK = new JMenu("File");
    FMK.setMnemonic(KeyEvent.VK_F);
    MBL.add(FMK);
   
    JMenu findOptionsMenu = new JMenu("Options");
    Icon atIcon = new ImageIcon("at.gif");
    findOptionsMenu.setIcon(atIcon);
    findOptionsMenu.setMnemonic(KeyEvent.VK_O);
    FMK.add(findOptionsMenu);
    
    NW.setJMenuBar(MBL);
    NW.setSize(300, 250);
    NW.setVisible(true);
  }
}

[kelfro]

To know about the functionality of JRadioButtonMenuItem class, I suggest you study following nested classes of this java class:

• JRadioButtonMenuItem.AccessibleJRadioButtonMenuItem
• AbstractButton.ButtonChangeListener
• Container.AccessibleAWTContainer
• Component.BaselineResizeBehavior
• AbstractButton.AccessibleAbstractButton