SWING - JCheckBox Class
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
| Sr.No. | Constructor & Description |
|---|---|
| 1 | JCheckBox() Creates an initially unselected check box button with no text and no icon. |
| 2 | JCheckBox(Action a) Creates a checkbox where the properties are taken from the Action supplied. |
| 3 | JCheckBox(Icon icon) Creates an initially unselected checkbox with an icon. |
| 4 | JCheckBox(Icon icon, boolean selected) Creates a checkbox with an icon and specifies whether or not it is initially selected. |
| 5 | JCheckBox(String text) Creates an initially unselected checkbox with text. |
| 6 | JCheckBox(String text, boolean selected) Creates a checkbox with the text and specifies whether or not it is initially selected. |
| 7 | JCheckBox(String text, Icon icon) Creates an initially unselected checkbox with the specified text and icon. |
| 8 | JCheckBox(String text, Icon icon, boolean selected) Creates a checkbox with text and icon, and specifies whether or not it is initially selected. |
Class Methods
| Sr.No. | 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 which 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 checkbox 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 the command prompt. Go to D:/ > SWING and type the following command.
D:\SWING>javac com\tutorialspoint\gui\SwingControlDemo.java
If no error occurs, it means the compilation is successful. Run the program using the following command.
D:\SWING>java com.tutorialspoint.gui.SwingControlDemo
Verify the following output.
