Mengenal Cell Renderer Kelas JComboBox Di Pemrograman Java

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// Nama file : DemoComboBoxCellRenderer.java
// Menggunakan cell renderer di obyek combo box

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

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

   final int JUMLAH_WARNA = 9;
   private JComboBox comboBox;
   private DefaultComboBoxModel comboBoxModel;
   private ListCellRenderer renderer;
   private JPanel panel;

   // Konstruktor tanpa argumen
   public DemoComboBoxCellRenderer() {

      comboBoxModel = new DefaultComboBoxModel();

      // Mengkonstruksi list cell renderer
      comboBoxModel.addElement(new Object[] {Color.BLACK, "Black Color"});
      comboBoxModel.addElement(new Object[] {Color.YELLOW, "Yellow Color"});
      comboBoxModel.addElement(new Object[] {Color.MAGENTA, "Magenta Color"});
      comboBoxModel.addElement(new Object[] {Color.GREEN, "Green Color"});
      comboBoxModel.addElement(new Object[] {Color.CYAN, "Cyan Color"});
      comboBoxModel.addElement(new Object[] {Color.ORANGE, "Orange Color"});
      comboBoxModel.addElement(new Object[] {Color.BLUE, "Blue Color"});
      comboBoxModel.addElement(new Object[] {Color.PINK, "Pink Color"});
      comboBoxModel.addElement(new Object[] {Color.RED, "Red Color"});

      renderer = new ButtonLabelRenderer();

      comboBox = new JComboBox(comboBoxModel);
      comboBox.setRenderer(renderer);
      comboBox.setMaximumRowCount(4);
      comboBox.addActionListener(this);

      // Mengkonstruksi dan menyesuaikan warna panel dengan indek combo box 0
      panel = new JPanel();
      Object[] duaObjek = (Object[])(comboBox.getItemAt(0));
      panel.setBackground((Color)duaObjek[0]);

      getContentPane().add(comboBox, BorderLayout.PAGE_START);
      getContentPane().add(panel, BorderLayout.CENTER);
   }

   // Menangani pemilihan elemen di list
   public void actionPerformed(ActionEvent ae) {

      Object[] duaObjek = (Object[])(comboBox.getSelectedItem());
      panel.setBackground((Color)duaObjek[0]);
   }

   // Metoda main
   public static void main(String[] args) {
      DemoComboBoxCellRenderer frame = new DemoComboBoxCellRenderer(); 
      frame.setTitle("Kelas DemoComboBoxCellRenderer");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(280, 200);
      frame.setVisible(true);
   }
}