Java Swing Tutorial - Java JCheckBox(Icon icon, boolean selected) Constructor

Syntax

JCheckBox(Icon icon, boolean selected) constructor from JCheckBox has the following syntax.

public JCheckBox(Icon icon,   boolean selected)

Example

In the following code shows how to use JCheckBox.JCheckBox(Icon icon, boolean selected) constructor.

//from ww  w  .  j  a v  a2  s  . c om
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.Icon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel implements ItemListener {
  public Main() {
    // Add check boxes to the content pane.
    Icon normal = new MyIcon(Color.red);
    Icon rollover = new MyIcon(Color.YELLOW);
    Icon selected = new MyIcon(Color.BLUE);

    JCheckBox cb = new JCheckBox(normal,true);
    cb.setRolloverIcon(rollover);
    cb.setSelectedIcon(selected);
    cb.addItemListener(this);
    add(cb);

  }

  public void itemStateChanged(ItemEvent ie) {
    JCheckBox cb = (JCheckBox) ie.getItem();
    int state = ie.getStateChange();
    if (state == ItemEvent.SELECTED)
      System.out.println(cb.getText() + " selected");
    else
      System.out.println(cb.getText() + " cleared");
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new Main());

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }

}

class MyIcon implements Icon {
  Color cl;

  public MyIcon(Color c) {
    cl = c;
  }

  public int getIconWidth() {
    return 32;
  }

  public int getIconHeight() {
    return 32;
  }

  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.setColor(cl);
    g.drawString("java2s.com", 0, 20);
  }
}