Multiple Document Interface (MDI) Di Pemrograman Java

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// Nama file : AplikasiMDI.java
// Menggunakan kelas JDesktopPane dan JInternalFrame

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

// Deklarasi kelas
public class AplikasiMDI extends JFrame {

   private JMenuBar mnuBar;
   private JMenu mnuForm;
   private JMenuItem mnuItemFlow, mnuItemGrid, mnuItemBorder;
   private JDesktopPane desktopPane;
   private JInternalFrame intFrameFlow, intFrameGrid, intFrameBorder;
   private JPanel panelFlow, panelGrid, panelBorder;

   // Kontruktor tanpa argumen
   public AplikasiMDI() {

      // Membuat menu
      mnuBar = new JMenuBar();
      mnuForm = new JMenu("Form");
      mnuItemFlow = new JMenuItem("Form With FlowLayout");
      mnuItemGrid = new JMenuItem("Form With GridLayout");
      mnuItemBorder = new JMenuItem("Form With BorderLayout");
      mnuForm.add(mnuItemFlow);
      mnuForm.add(mnuItemGrid);
      mnuForm.add(mnuItemBorder);
      mnuBar.add(mnuForm);
      setJMenuBar(mnuBar);
      
      // menambahkan desktopPane ke content pane kelas JFrame
      desktopPane = new JDesktopPane();

      // Membuat internal frame pertama
      intFrameFlow = new JInternalFrame("FlowLayout", true, true, true, true);
      panelFlow = new JPanel();
      panelFlow.setLayout(new FlowLayout(FlowLayout.LEFT, 3, 3));
      for (int xFlow = 0; xFlow < 5; xFlow++)
         panelFlow.add(new JButton("Tombol" + (xFlow + 1)));
      intFrameFlow.getContentPane().add(panelFlow);
      intFrameFlow.setSize(250, 150);
      intFrameFlow.setDefaultCloseOperation(HIDE_ON_CLOSE);
      
      // Membuat internal frame kedua
      intFrameGrid = new JInternalFrame("GridLayout", true, true, true, true);
      panelGrid = new JPanel();
      panelGrid.setLayout(new GridLayout(3, 2, 3, 3));
      for (int xGrid = 0; xGrid < 5; xGrid++)
         panelGrid.add(new JButton("Tombol" + (xGrid + 1)));
      intFrameGrid.getContentPane().add(panelGrid);
      intFrameGrid.setSize(250, 150);  
      intFrameGrid.setDefaultCloseOperation(HIDE_ON_CLOSE);

      // Membuat internal frame ketiga
      intFrameBorder = new JInternalFrame("BoderLayout", true, true, true, true);
      panelBorder = new JPanel();
      panelBorder.setLayout(new BorderLayout(3, 3));
      panelBorder.add((new JButton("Tombol1")), BorderLayout.LINE_START);
      panelBorder.add((new JButton("Tombol2")), BorderLayout.LINE_END);
      panelBorder.add((new JButton("Tombol3")), BorderLayout.PAGE_START);
      panelBorder.add((new JButton("Tombol4")), BorderLayout.PAGE_END);
      panelBorder.add((new JButton("Tombol5")), BorderLayout.CENTER);
      intFrameBorder.getContentPane().add(panelBorder);
      intFrameBorder.setSize(270, 150);
      intFrameBorder.setDefaultCloseOperation(HIDE_ON_CLOSE);

      desktopPane.add(intFrameFlow);
      desktopPane.add(intFrameGrid);
      desktopPane.add(intFrameBorder);
      getContentPane().add(desktopPane, BorderLayout.CENTER);

      mnuItemFlow.addActionListener(
         new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               intFrameFlow.setLocation(10, 10);
               intFrameFlow.setVisible(true);
            }
         }
      );

      mnuItemGrid.addActionListener(
         new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               intFrameGrid.setLocation(40, 34);
               intFrameGrid.setVisible(true);
            }
         }
      );

      mnuItemBorder.addActionListener(
         new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               intFrameBorder.setLocation(70, 58);
               intFrameBorder.setVisible(true);
            }
         }
      );

   } // Akhir blok konstruktor
  
   // Metoda main
   public static void main(String[] args) {
      AplikasiMDI frame = new AplikasiMDI();
      frame.setTitle("Kelas AplikasiMDI");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(400, 270);
      frame.setVisible(true);
   }
}