Add a Disabled Icon to a JButton Component in Java

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import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main{
  
  public static void main(String[] a){
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    
    JButton button = new JButton();
    button.setEnabled(false);
    f.add(button);

    // Set a disabled version of icon
    Icon disabledIcon = new ImageIcon("d.gif");
    button.setDisabledIcon(disabledIcon);

    // To remove the disabled version of the icon, set to null
    //button.setDisabledIcon(null);
    
    f.setSize(500,500);
    f.setVisible(true);
  }
}