Java Swing UI JCheckBox

Java Swing UI JCheckBox

1:52 PM

Introduction

The class JCheckBox is an implementation of a check box - an item that can be selected or deselected, and which displays its state to the user.

Class declaration

Following is the declaration for javax.swing.JCheckBox class −
public class JCheckBox
   extends JToggleButton
      implements Accessible

Field

Following are the fields for javax.swing.JCheckBox class −
  • static String BORDER_PAINTED_FLAT_CHANGED_PROPERTY − Identifies a change to the flat property.

Class constructors

S.N. Constructor & Description
1 JCheckBox() Creates an initially unselected check box button with no text, no icon.
2 JCheckBox(Action a) Creates a check box where properties are taken from the Action supplied.
3 JCheckBox(Icon icon) Creates an initially unselected check box with an icon.
4 JCheckBox(Icon icon, boolean selected) Creates a check box with an icon and specifies whether or not it is initially selected.
5 JCheckBox(String text) Creates an initially unselected check box with text.
6 JCheckBox(String text, boolean selected) Creates a check box with text and specifies whether or not it is initially selected.
7 JCheckBox(String text, Icon icon) Creates an initially unselected check box with the specified text and icon.
8 JCheckBox(String text, Icon icon, boolean selected) Creates a check box with text and icon, and specifies whether or not it is initially selected.

Class methods

S.N. Method & Description
1 AccessibleContext getAccessibleContext() Gets the AccessibleContext associated with this JCheckBox.
2 String getUIClassID() Returns a string that specifies the name of the L&F class that renders this component.
3 boolean isBorderPaintedFlat() Gets the value of the borderPaintedFlat property.
4 protected String paramString() Returns a string representation of this JCheckBox.
5 void setBorderPaintedFlat(boolean b) Sets the borderPaintedFlat property, which gives a hint to the look and feel as to the appearance of the check box border.
6 void updateUI() Resets the UI property to a value from the current look and feel.

Methods inherited

This class inherits methods from the following classes:
  • javax.swing.AbstractButton
  • javax.swing.JToggleButton
  • javax.swing.JComponent
  • java.awt.Container
  • java.awt.Component
  • java.lang.Object

JCheckBox Example

Create the following java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >
SwingControlDemo.java 
package com.tutorialspoint.gui;
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class SwingControlDemo {
    
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingControlDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showCheckBoxDemo();
   }

   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    

      statusLabel.setSize(350,100);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showCheckBoxDemo(){

      headerLabel.setText("Control in action: CheckBox"); 

      final JCheckBox chkApple = new JCheckBox("Apple");
      final JCheckBox chkMango = new JCheckBox("Mango");
      final JCheckBox chkPeer = new JCheckBox("Peer");

      chkApple.setMnemonic(KeyEvent.VK_C);
      chkMango.setMnemonic(KeyEvent.VK_M);
      chkPeer.setMnemonic(KeyEvent.VK_P);

      chkApple.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {         
            statusLabel.setText("Apple Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });

      chkMango.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Mango Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked")); 
         }           
      });

      chkPeer.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Peer Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });

      controlPanel.add(chkApple);
      controlPanel.add(chkMango);
      controlPanel.add(chkPeer);       

      mainFrame.setVisible(true);  
   }
}
Compile the program using command prompt. Go to D:/ > SWING and type the following command.
D:\SWING>javac com\tutorialspoint\gui\SwingControlDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\SWING>java com.tutorialspoint.gui.SwingControlDemo
Verify the following output
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