Java Swing Checkbox Easy Example
Java Swing | JCheckBox with examples
JCheckBox is a part of Java Swing package . JCheckBox can be selected or deselected . It displays it state to the user . JCheckBox is an implementation to checkbox . JCheckBox inherits JToggleButton class.
Constructor of the class are :
- JCheckBox() : creates a new checkbox with no text or icon
- JCheckBox(Icon i) : creates a new checkbox with the icon specified
- JCheckBox(Icon icon, boolean s) : creates a new checkbox with the icon specified and the boolean value specifies whether it is selected or not.
- JCheckBox(String t) :creates a new checkbox with the string specified
- JCheckBox(String text, boolean selected) :creates a new checkbox with the string specified and the boolean value specifies whether it is selected or not.
- JCheckBox(String text, Icon icon) :creates a new checkbox with the string and the icon specified.
- JCheckBox(String text, Icon icon, boolean selected): creates a new checkbox with the string and the icon specified and the boolean value specifies whether it is selected or not.
Methods to add Item Listener to checkbox.
- addActionListener(ItemListener l): adds item listener to the component
- itemStateChanged(ItemEvent e) : abstract function invoked when the state of the item to which listener is applied changes
- getItem() : Returns the component-specific object associated with the item whose state changed
- getStateChange() : Returns the new state of the item. The ItemEvent class defines two states: SELECTED and DESELECTED.
- getSource() : Returns the component that fired the item event.
Commonly used methods:
- setIcon(Icon i) : sets the icon of the checkbox to the given icon
- setText(String s) :sets the text of the checkbox to the given text
- setSelected(boolean b) : sets the checkbox to selected if boolean value passed is true or vice versa
- getIcon() : returns the image of the checkbox
- getText() : returns the text of the checkbox
- updateUI() : resets the UI property with a value from the current look and feel.
- getUI() : returns the look and feel object that renders this component.
- paramString() : returns a string representation of this JCheckBox.
- getUIClassID() : returns the name of the Look and feel class that renders this component.
- getAccessibleContext() : gets the AccessibleContext associated with this JCheckBox.
- isBorderPaintedFlat() : gets the value of the borderPaintedFlat property.
- setBorderPaintedFlat(boolean b) : sets the borderPaintedFlat property,
The following programs will illustrate the use of JCheckBox
1. Program to create a simple checkbox using JCheckBox
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame {
static JFrame f;
public static void main(String[] args)
{
f = new JFrame( "frame" );
f.setLayout( new FlowLayout());
JCheckBox c1 = new JCheckBox( "checkbox 1" );
JCheckBox c2 = new JCheckBox( "checkbox 2" );
JPanel p = new JPanel();
p.add(c1);
p.add(c2);
f.add(p);
f.setSize( 300 , 300 );
f.show();
}
}
Output :
2. Program to create a checkbox with a icon .
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame {
static JFrame f;
public static void main(String[] args)
{
f = new JFrame( "frame" );
f.setLayout( new FlowLayout());
JCheckBox c1 = new JCheckBox( "checkbox with image" , new ImageIcon( "f:/gfg.jpg" ), true );
JCheckBox c2 = new JCheckBox( "checkbox 2" );
JPanel p = new JPanel();
p.add(c1);
p.add(c2);
f.add(p);
f.setSize( 300 , 300 );
f.show();
}
}
Output :
3. Program to create a checkbox and ItemListener to it.
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame implements ItemListener {
static JFrame f;
static JLabel l, l1;
static JCheckBox c1, c2;
public static void main(String[] args)
{
f = new JFrame( "frame" );
solve s = new solve();
f.setLayout( new FlowLayout());
c1 = new JCheckBox( "geeksforgeeks" , new ImageIcon( "f:/gfg.jpg" ), false );
c2 = new JCheckBox( "checkbox 2" , false );
c1.addItemListener(s);
c2.addItemListener(s);
l = new JLabel( "geeksforgeeks not selected" );
l1 = new JLabel( "checkbox2 not selected" );
l.setForeground(Color.red);
l1.setForeground(Color.blue);
JPanel p = new JPanel();
p.add(c1);
p.add(c2);
p.add(l);
p.add(l1);
f.add(p);
f.setSize( 600 , 300 );
f.show();
}
public void itemStateChanged(ItemEvent e)
{
if (e.getSource() == c1) {
if (e.getStateChange() == 1 )
l.setText( "geeksforgeeks selected" );
else
l.setText( "geeksforgeeks not selected" );
}
else {
if (e.getStateChange() == 1 )
l1.setText( "checkbox 2 selected" );
else
l1.setText( "checkbox 2 not selected" );
}
}
}
Output :
Note : the above programs might not run in a online compiler please use an offline IDE
Source: https://www.geeksforgeeks.org/java-swing-jcheckbox-examples/
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