check box group

[Yasir Qureshi]

How should i use checkboxgroup in swing.
Yasir

[Rene Liebmann]

Hi
If you are looking to the API, then you will find following little sample code:

  
 setLayout(new GridLayout(3, 1));
 CheckboxGroup cbg = new CheckboxGroup();
 add(new Checkbox("one", cbg, true));
 add(new Checkbox("two", cbg, false));
 add(new Checkbox("three", cbg, false)); 

As for a short description, imagine you have a bundle of Checkboxes, which belong together, like on and off or some colors. Anyway, there can be only one selection and not several. If you don't want to take RadioButtons with a ButtonGroup, then you can take Checkboxes with a CheckBoxGroup. This group manages, that there can be only one selection in its members.

[Yasir Qureshi]

thanks a lot but gave solution in awt.
I have written following code, but its allowing multiple checkbox to be selected.
ButtonGroup bg=new ButtonGroup();
JButton b1=new JButton("b1");
JButton b2=new JButton("b2");
JButton b3=new JButton("b3");
bg.add(b1);bg.add(b2);bg.add(b3);
How could i allow single box to be selected.
i.e equivalent of button.setCheckboxGroup() in swing.
Yasir

[Rene Liebmann]

Sorry, I forgot that you need a solution for Swing.
Here is the code that you need:

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

public class CheckBoxTest extends JFrame {
  JPanel jPanel1 = new JPanel();
  GridBagLayout gridBagLayout1 = new GridBagLayout();
  JCheckBox chb1 = new JCheckBox();
  JCheckBox chb2 = new JCheckBox();
  JCheckBox chb3 = new JCheckBox();
  JCheckBox chb4 = new JCheckBox();
  ButtonGroup buttonGroup1 = new ButtonGroup();
  public CheckBoxTest() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    CheckBoxTest checkBoxTest1 = new CheckBoxTest();
    checkBoxTest1.setSize(200,200);
    checkBoxTest1.show();
  }
  private void jbInit() throws Exception {
    jPanel1.setLayout(gridBagLayout1);
    chb1.setSelected(true);
    chb1.setText("1");
    chb2.setText("2");
    chb3.setText("3");
    chb4.setText("4");
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    jPanel1.add(chb1,  new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    jPanel1.add(chb2,  new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    jPanel1.add(chb3,  new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    jPanel1.add(chb4,  new GridBagConstraints(0, 3, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    buttonGroup1.add(chb1);
    buttonGroup1.add(chb2);
    buttonGroup1.add(chb3);
    buttonGroup1.add(chb4);
  }
}