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Expertise: Intermediate
Language: Java

October 29, 1998

Creating Radio Buttons Using Swing

Radio buttons behave in the same mutually exclusive way in Swing and the AWT. However, the way that you create a set of radio buttons differs significantly between Swing and the AWT. To create a set of radio buttons in Swing, you must instantiate the buttons, instantiate a ButtonGroup object, and add the buttons to the ButtonGroup object. With the AWT, you must create a group object and pass it to the constructor for the buttons when they are instantiated. This code was tested using JDK1.1.6 and Swing 1.0.3 under Win95.

 
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import com.sun.java.swing.*;
//=======================================================//
public class SwingRadioButton01 extends JFrame{
	public static void main(String[] args){
		new SwingRadioButton01();
	}//end main

	SwingRadioButton01(){//constructor
		//Create three radio buttons   
		JRadioButton aButton = new JRadioButton("A",true);
		JRadioButton bButton = new JRadioButton("B");
		JRadioButton cButton = new JRadioButton("C");

		//Create a ButtonGroup object, add buttons to the group
		ButtonGroup myButtonGroup = new ButtonGroup();
		myButtonGroup.add(aButton);
		myButtonGroup.add(bButton);
		myButtonGroup.add(cButton);

		//Display radio buttons
		getContentPane().setLayout(new FlowLayout());
		getContentPane().add(aButton);
		getContentPane().add(bButton);
		getContentPane().add(cButton);
		setSize(250,100);
		setTitle("Swing Radio Buttons");
		setVisible(true);
    
		// Inner class to terminate program.
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);}});//end WindowListener
	}//end constructor
}//end class SwingRadioButton01 definition