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How to clear  Check Box and Radio Box?

Posted on 2009-03-29
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Last Modified: 2012-05-06
Dear experts:

I would like to learn how to clear  Radio Buttons and Check Boxes when "Clear" button is clicked.

Thanks!
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Question by:duta
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16 Comments
 
LVL 12

Expert Comment

by:basav_com
ID: 24011905
0
 
LVL 92

Expert Comment

by:objects
ID: 24011924
you can use the clearSelection() method in ButtonGroup
pre-1.6 for radio buttons you can use an extra hidden radio button, and select it to clear the selected one.
0
 

Author Comment

by:duta
ID: 24011955
Thank you so much, Master and Savant.

TO: SAVANT:

Suppose that there are a radio button named "radioBtn" and a check box named checkChb".

To clear them, should I use:

radioBtn.clearSelection ( );
checkChb.clearSelection ( );

TO: MASTER:
I checked http://www.rgagnon.com/javadetails/java-0221.html.
It is a little complicated. But I will take time to read the  tip available at the site again.

Thanks!

0
 
LVL 92

Expert Comment

by:objects
ID: 24011964
No, you call clearSelection() on the ButtonGroup
0
 

Author Comment

by:duta
ID: 24012086
I have a code like this:
 private  void   clearField  (  )
      {
         ;
          ButtonGroup.clearSelection ( );
      }

When I ran the code, I got an error message as the follows:
cannot-find.jpg
0
 
LVL 92

Accepted Solution

by:
objects earned 250 total points
ID: 24012093
you need to call that on your ButtonGroup object, not the class itself.

 ButtonGroup group = new ButtonGroup();

// add your buttons to the group in some other method

 private  void   clearField  (  )
      {
          group.clearSelection ( );
      }

0
 

Author Comment

by:duta
ID: 24012920

Savant, I still get an error message as below:

ERROR: cannot find symbol
Symbol:  method  clearSelection
location:  class   javax.swing.ButtonGroup


Thanks a lot!


__________________ My Current Code ______________
import    javax.swing.ButtonGroup;

private    ButtonGroup    RadioButtonButtonGroup;
private    ButtonGroup   CheckBoxButtonGroup

RadioButtonButtonGroup  =  new  ButtonGroup (  );
CheckBoxButtonGroup    =  new  ButtonGroup (  );

.
.
private    void   clearField ( )
{
    RadioButtonGroup.clearSelection ( );
   CheckBoxButtonGroup.clearSelection ( );
}

0
 
LVL 15

Expert Comment

by:fsze88
ID: 24013109
I tested this, works

    private ButtonGroup bg = new ButtonGroup() ;
    private JCheckBox jCheckBox1 = new JCheckBox();
    private JCheckBox jCheckBox2 = new JCheckBox();
        bg.add(jCheckBox1);
        bg.add(jCheckBox2);
        bg.clearSelection();
0
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Author Comment

by:duta
ID: 24013231


I created a simple class (as below) to test your code.  I still got the same error:

cannot find symbol
symbol: method clearSelection ( )

I just wonder what classes you imported.



___________ My test code ________
import  javax.swing.*;
import  java.awt.*;

public class test extends JFrame
{
   public static void main ( String [] args)
   {

    ButtonGroup bg = new ButtonGroup() ;
    JCheckBox jCheckBox1 = new JCheckBox();
    JCheckBox jCheckBox2 = new JCheckBox();
        bg.add(jCheckBox1);
        bg.add(jCheckBox2);
        bg.clearSelection();
   }
}________________________________________
0
 
LVL 15

Assisted Solution

by:fsze88
fsze88 earned 250 total points
ID: 24013330
what's your jdk version? code snippet works fine...

C:\Documents and Settings\fsze88\Lb\experts-exchange\java>java -version
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)
import  javax.swing.*;

import  java.awt.*;

import java.awt.event.MouseAdapter;
 

import java.awt.event.MouseEvent;
 
 

public class test extends JFrame

{

    private JPanel panelCenter = new JPanel ();

    ButtonGroup bg = new ButtonGroup() ;

    JCheckBox jCheckBox1 = new JCheckBox();

    JCheckBox jCheckBox2 = new JCheckBox();

    private JButton jButton1 = new JButton();

    

  public test(){

    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    jButton1.setText("testing");

    jButton1.setBounds(new Rectangle(100,   100, 50, 50));
 

    jButton1.addMouseListener(new MouseAdapter() {

        public void mouseClicked(MouseEvent e) {

            bg.clearSelection();

        }

    });

    bg.add(jCheckBox1);

    bg.add(jCheckBox2);
 

    jCheckBox1.setBounds(new Rectangle(200, 200, 50, 50));

    jCheckBox2.setBounds(new Rectangle(300, 200, 50, 50));
 

    panelCenter.add(jCheckBox1, null);

    panelCenter.add(jCheckBox2, null);

    panelCenter.add(jButton1, null);

    this.getContentPane().add( panelCenter);
 

    this.setSize(new Dimension(800, 600));

    this.setVisible(true);

    

  

  }

   public static void main ( String [] args)

   {

    new test();

   }

}

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0
 

Author Comment

by:duta
ID: 24013350

I use the following version:

jdk  1.5.0_09
jre 1.5.0   _07
             

Thanks a lot!
0
 

Author Comment

by:duta
ID: 24013354
When I tested your latest, I got the same error.

I guess I need to upgrade jdk to 1.6.

0
 

Author Comment

by:duta
ID: 24013357
I wonder what version of JDK or JRE  you use.
0
 
LVL 15

Expert Comment

by:fsze88
ID: 24013360
yes, I think so
0
 
LVL 15

Expert Comment

by:fsze88
ID: 24013394
jre 1.6.0.12, jdk 1.6.0.12
after updated jdk to the lastest version.It should updated with jre automatically...
0
 

Author Closing Comment

by:duta
ID: 31563997
Thank you very much, master and savant!
0

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