RadioButton

import java.awt.*;
import javax.swing.*;

class Radiobutton extends JFrame
{
 JRadioButton first,second,third,fourth,fifth;
 Radiobutton()
 {    
     first = new JRadioButton("First");
     second = new JRadioButton("Second");
     third = new JRadioButton("Third");
     fourth = new JRadioButton("Fourth");
     fifth = new JRadioButton("Fifth");
    
     //Add on Frame
     add(first);
     add(second);
     add(third);
     add(fourth);
     add(fifth);
  
     ButtonGroup bg = new ButtonGroup();
     bg.add(first);
     bg.add(second);
     bg.add(third);
     bg.add(fourth);
     bg.add(fifth); 
 }
  
 public static void main(String[] args) 
 {
     JFrame win = new Radiobutton();
  
     win.setTitle("Radiobutton");
     win.setSize(400,100);
     win.setLayout(new FlowLayout());
     win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     win.setVisible(true);
 }  
}

Output