Mengenal List Model dan DefaultListModel Kelas JList Di Java

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// Nama file : MenggunakanListModel.java
// Menggunakan list model untuk menambah, menghapus dan merubah elemen

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

// Deklarasi kelas
public class MenggunakanListModel extends JFrame {

   private int jmlElemenAwal = 15;
   private JButton jbtTambah, jbtHapus, jbtRubah;
   private JList list;
   private DefaultListModel listModel;
   private JTextArea textArea;
   private JScrollPane scrollPane1, scrollPane2;

   public MenggunakanListModel() {

      // Mengkonstruksi list model dan menambahkan elemen
      listModel = new DefaultListModel();
      for (int x = 0; x < jmlElemenAwal; x++)
         listModel.addElement("Elemen " + (x + 1));

      list = new JList(listModel);
      scrollPane1 = new JScrollPane(list);
      scrollPane1.setBorder(new TitledBorder("Daftar Elemen"));

      textArea = new JTextArea();
      textArea.setEditable(false);
      textArea.setText("Jumlah elemen awal di list : " + jmlElemenAwal);
      scrollPane2 = new JScrollPane(textArea);
      scrollPane2.setBorder(new TitledBorder("Operasi List"));

      JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true);
      splitPane.setLeftComponent(scrollPane1);
      splitPane.setRightComponent(scrollPane2);
      splitPane.setOneTouchExpandable(true);

      jbtTambah = new JButton("Tambah");
      jbtHapus = new JButton("Hapus");
      jbtRubah = new JButton("Rubah");

      JPanel panel = new JPanel();
      panel.setLayout(new GridLayout(1, 3, 0, 3));
      panel.add(jbtTambah);
      panel.add(jbtHapus);
      panel.add(jbtRubah);

      getContentPane().setLayout(new BorderLayout(4, 0));
      getContentPane().add(splitPane, BorderLayout.CENTER);
      getContentPane().add(panel, BorderLayout.PAGE_END);

      jbtTambah.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent ae) {
            String newElemen = 
               JOptionPane.showInputDialog("Masukkan elemen baru");
        
            if (newElemen != null) {
               if (listModel.contains(newElemen))
                  JOptionPane.showMessageDialog(null, "Elemen sudah ada.",
                     "Tambah Elemen", JOptionPane.INFORMATION_MESSAGE);
               else {
                  if (list.getSelectedIndex() == -1) {
                    listModel.addElement(newElemen);                
                    textArea.append("\nMenambah " + newElemen + " di posisi akhir");
                 }
                 else {
                    listModel.add(list.getSelectedIndex(), newElemen);
                    textArea.append("\nMenambah " + newElemen + 
                       " pada indek " + list.getSelectedIndex());
                 }
              }
           }
        }
     });

     jbtHapus.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
           if (list.getSelectedIndex() == -1) 
              JOptionPane.showMessageDialog(null, "Pilih elemen yang akan dihapus",
                 "Hapus Elemen", JOptionPane.INFORMATION_MESSAGE);
           else {
              Object strElemen = listModel.getElementAt(list.getSelectedIndex());
              textArea.append("\nMenghapus " + strElemen);
              listModel.remove(list.getSelectedIndex());
           }
        }
     });

     jbtRubah.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
           if (list.getSelectedIndex() == -1) 
              JOptionPane.showMessageDialog(null, "Pilih elemen yang dirubah",
                 "Rubah Elemen", JOptionPane.INFORMATION_MESSAGE);
           else {
              String newElemen = 
                 JOptionPane.showInputDialog("Masukkan elemen pengganti");
              if (newElemen != null) {
                 Object strElemen = listModel.getElementAt(list.getSelectedIndex());
                 listModel.set(list.getSelectedIndex(), newElemen);
                 textArea.append("\nMerubah " + strElemen + " menjadi " + newElemen);
               }
            }
         }
      });
   }

   // Metoda main
   public static void main(String[] args) {
      MenggunakanListModel frame = new MenggunakanListModel();
      frame.setTitle("Kelas MenggunakanListModel");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(400, 200);
      frame.setVisible(true);
   }
}