RadioExample.java

import javax.swing.*;
import java.awt.event.*;
class RadioExample extends JFrame implements ActionListener{
	JRadioButton rb1,rb2;
	JButton b;
	RadioExample(){
		rb1=new JRadioButton("Male");
		rb1.setBounds(100,50,100,30);
		rb2=new JRadioButton("Female");
		rb2.setBounds(100,100,100,30);
		ButtonGroup bg=new ButtonGroup();
		bg.add(rb1);
		bg.add(rb2);
		b=new JButton("click");
		b.setBounds(100,150,80,30);
		b.addActionListener(this);
		add(rb1);
		add(rb2);
		add(b);
		setSize(300,300);
		setLayout(null);
		setVisible(true);
	}
	public void actionPerformed(ActionEvent e){
		if(rb1.isSelected()){  //  determine  the  button  state
			JOptionPane.showMessageDialog(this,"You are male");
		}
		if(rb2.isSelected()){
			JOptionPane.showMessageDialog(this,"You are female");
		}
	}
	public static void main(String args[]){
		new RadioExample();
	}
}