Program Java Kelas JRadioButton Mengubah Warna Teks Di Label

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// Nama file : RadioButtonDemo.java
// Mendemonstrasikan penggunaan JRadioButton

// Mengimpor kelas
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

// Deklarasi kelas
public class RadioButtonDemo extends JFrame implements ActionListener {

   private JPanel panel;
   private JLabel label;
   private JRadioButton black, red, green, blue, magenta, orange;

   public RadioButtonDemo() {

      Font font = new Font("Tahoma", Font.PLAIN, 20);
      label = new JLabel("Bahasa Java mudah dipelajari", JLabel.CENTER);
      label.setFont(font);
      getContentPane().setBackground(Color.WHITE);
      getContentPane().add(label, BorderLayout.CENTER);

      black = new JRadioButton("BLACK", true);
      red = new JRadioButton("RED");
      green = new JRadioButton("GREEN");
      blue = new JRadioButton("BLUE");
      magenta = new JRadioButton("MAGENTA");
      orange = new JRadioButton("ORANGE");
 
      // Meletakkan dan menyusun obyek radio button di panel
      panel = new JPanel();
      panel.setLayout(new GridLayout(2, 3));
      panel.add(black);
      panel.add(red);
      panel.add(green);
      panel.add(blue);
      panel.add(magenta);
      panel.add(orange);
      getContentPane().add(panel, BorderLayout.PAGE_END);

      // Mengelompokkan radio button
      ButtonGroup group = new ButtonGroup();
      group.add(black);
      group.add(red);
      group.add(green);
      group.add(blue);
      group.add(magenta);
      group.add(orange);
      
      // Meregistrasi listener
      black.addActionListener(this);
      red.addActionListener(this);      
      green.addActionListener(this);
      blue.addActionListener(this);
      magenta.addActionListener(this);
      orange.addActionListener(this);
   }

   // Deklarasi metoda actionPerformed
   public void actionPerformed(ActionEvent ae) {

      if (ae.getSource() == black)
         label.setForeground(Color.BLACK);

      if (ae.getSource() == red)
         label.setForeground(Color.RED);

      if (ae.getSource() == green)
         label.setForeground(Color.GREEN);

      if (ae.getSource() == blue)
         label.setForeground(Color.BLUE);

      if (ae.getSource() == magenta)
         label.setForeground(Color.MAGENTA);

      if (ae.getSource() == orange)
         label.setForeground(Color.ORANGE);
   }

   // Metoda main
   public static void main(String[] args) {

      RadioButtonDemo frame = new RadioButtonDemo();
      frame.setTitle("Kelas RadioButtonDemo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(320, 170);
      frame.setVisible(true);
   }
}