Creating JRadioButton Components : JRadioButton « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JRadioButton

1. A JRadioButton represents a radio button.
2. You can use multiple JRadioButtons to represents a selection from which only one item can be selected.
3. To indicate a logical grouping of radio buttons, you use a javax.swing.ButtonGroup object.
4. To programmatically select a JRadioButton, you pass true to its setSelected method.

public JRadioButton()
JRadioButton aRadioButton = new JRadioButton();

public JRadioButton(Icon icon)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));

public JRadioButton(Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false),  true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));

public JRadioButton(String text)
JRadioButton aRadioButton = new JRadioButton("4 slices");

public JRadioButton(String text, boolean selected)
JRadioButton aRadioButton = new JRadioButton("8 slices", true);

public JRadioButton(String text, Icon icon)
JRadioButton aRadioButton = new JRadioButton("12 slices",  new DiamondIcon(Color.CYAN, false));
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));

public JRadioButton(String text, Icon icon, boolean selected)
JRadioButton aRadioButton = new JRadioButton("16 slices",  new DiamondIcon(Color.CYAN, false), true);
aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true));

public JRadioButton(Action action)
Action action = ...;
JRadioButton aRadioButton = new JRadioButton(action);

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class MainClass {

  public static void main(String[] a) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(new JRadioButtonDemo());
    f.setSize(500, 500);
    f.setVisible(true);
  }
}

class JRadioButtonDemo extends JPanel implements ActionListener {
  JTextField tf;

  public void init() {
    try {
      SwingUtilities.invokeAndWait(new Runnable() {
        public void run() {
          makeGUI();
        }
      });
    } catch (Exception exc) {
      System.out.println("Can't create because of " + exc);
    }
  }

  private void makeGUI() {

    setLayout(new FlowLayout());

    JRadioButton b1 = new JRadioButton("A");
    b1.addActionListener(this);
    add(b1);

    JRadioButton b2 = new JRadioButton("B");
    b2.addActionListener(this);
    add(b2);

    JRadioButton b3 = new JRadioButton("C");
    b3.addActionListener(this);
    add(b3);

    ButtonGroup bg = new ButtonGroup();
    bg.add(b1);
    bg.add(b2);
    bg.add(b3);

    tf = new JTextField(5);
    add(tf);
  }

  public void actionPerformed(ActionEvent ae) {
    tf.setText(ae.getActionCommand());
  }
}

14.9.JRadioButton
	14.9.1.	Creating JRadioButton Components
	14.9.2.	Using JRadioButton
	14.9.3.	Grouping JRadioButton Components in a ButtonGroup
	14.9.4.	Determining the Selected JRadioButton in a Button Group
	14.9.5.	Listening to JRadioButton Events with an ActionListener
	14.9.6.	Reference to the last selected item and check for reselection
	14.9.7.	Listening to JRadioButton Events with a ChangeListener
	14.9.8.	Listening to JRadioButton Events with an ItemListener
	14.9.9.	Event sequence: Action Event, Item Event and Change Event
	14.9.10.	Getting selected JRadioButton in a container
	14.9.11.	Customizing JRadioButton Look and Feel