Program Java: Menampilkan Efek Ikon Di Obyek Button Kelas JButton

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// Nama file : EfekIkon.java
// Mendemonstrasikan metoda setPressedIcon dan setRolloverIcon

// Mengimpor kelas
import javax.swing.*;
import java.awt.*;
import java.net.URL;

// Deklarasi kelas
public class EfekIkon extends JFrame {

   public EfekIkon() {

      Class metaObject = this.getClass();
      URL urlYellowFlag = metaObject.getResource("image2/yellowflag.png");
      URL urlBlueFlag = metaObject.getResource("image2/blueflag.png");
      URL urlRedFlag = metaObject.getResource("image2/redflag.png");

      ImageIcon iconYellowFlag = new ImageIcon(urlYellowFlag);
      ImageIcon iconBlueFlag = new ImageIcon(urlBlueFlag);
      ImageIcon iconRedFlag = new ImageIcon(urlRedFlag);

      JButton jbtFlag = new JButton("Bendera Warna", iconYellowFlag);
      jbtFlag.setPressedIcon(iconBlueFlag);
      jbtFlag.setRolloverIcon(iconRedFlag);

      getContentPane().add(jbtFlag, BorderLayout.CENTER);
   }

   // Metoda main
   public static void main(String[] args) {
      EfekIkon frame = new EfekIkon();
      frame.setTitle("Kelas EfekIcon");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(190, 100);
      frame.setVisible(true);
   }
}