Tutorialspoint

1 Answer
raja ramesh

JCheckBox
  • A JCheckBox can extend JToggleButton and it can be a small box that is either checked or unchecked.
  • When we click on a JCheckBox, it changes from checked to unchecked or vice versa automatically.
  • A JCheckBox can generate an ActionListener or an ItemListener whenever the checkbox is changed.
  • An isSelected() method is used to test if a checkbox is checked or not.
  • By default, we can select all the checkbox items at a time, if we want to select only one item at a time by using ButtonGroup class.

Example

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

public class JCheckBoxGroupTest extends JFrame {
   private ButtonGroup checkBoxGroup;
   private JCheckBox jcb1, jcb2, jcb3;
   private JPanel panel;
   public JCheckBoxGroupTest() {
      super("JCheckBoxGroup Test");
      panel = new JPanel(new GridLayout(3,0));
      jcb1 = new JCheckBox("India", true);
      jcb2 = new JCheckBox("England", false);
      jcb3 = new JCheckBox("Australia", false);
      checkBoxGroup = new ButtonGroup();

      //add CheckBoxes to ButtonGroup
      checkBoxGroup.add(jcb1);
      checkBoxGroup.add(jcb2);
      checkBoxGroup.add(jcb3);
      panel.add(jcb1);
      panel.add(jcb2);
      panel.add(jcb3);
      add(panel);

      setSize(375, 250);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLocationRelativeTo(null);
      setVisible(true);
   }
   public static void main(String args[]) {
      new JCheckBoxGroupTest();
   }
}

Output

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