ButtonGroup class

ButtonGroup class:

The ButtonGroup class can be used to group multiple buttons so that at a time only one button can be selected.

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JRadioButton example with event handling

1.    import javax.swing.*;  

2.    import java.awt.event.*;  

3.    class RadioExample extends JFrame implements ActionListener{  

4.    JRadioButton rb1,rb2;  

5.    JButton b;  

6.    RadioExample(){  

7.      

8.    rb1=new JRadioButton("Male");  

9.    rb1.setBounds(100,50,100,30);  

10.   

11. rb2=new JRadioButton("Female");  

12. rb2.setBounds(100,100,100,30);  

13.   

14. ButtonGroup bg=new ButtonGroup();  

15. bg.add(rb1);bg.add(rb2);  

16.   

17. b=new JButton("click");  

18. b.setBounds(100,150,80,30);  

19. b.addActionListener(this);  

20.   

21. add(rb1);add(rb2);add(b);  

22.   

23. setSize(300,300);  

24. setLayout(null);  

25. setVisible(true);  

26. }  

27. public void actionPerformed(ActionEvent e){  

28. if(rb1.isSelected()){  

29. JOptionPane.showMessageDialog(this,"You are male");  

30. }  

31. if(rb2.isSelected()){  

32. JOptionPane.showMessageDialog(this,"You are female");  

33. }  

34. }  

35. public static void main(String args[]){  

36. new RadioExample();  

37. }}