Java Swing How to - Use JDesktopPane to manage Internal frame (JInternalFrame)

Question

We would like to know how to use JDesktopPane to manage Internal frame (JInternalFrame).

Answer

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;

public class Main {
  public static void main(String[] args) {
    JPanel gui = new JPanel(new BorderLayout());
    gui.setPreferredSize(new Dimension(400, 100));

    JDesktopPane dtp = new JDesktopPane();
    gui.add(dtp, BorderLayout.CENTER);

    JButton newFrame = new JButton("Add Frame");

    ActionListener listener = new ActionListener() {
      private int disp = 10;

      @Override
      public void actionPerformed(ActionEvent e) {
        JInternalFrame jif = new JInternalFrame();
        dtp.add(jif);
        jif.setLocation(disp, disp);
        jif.setSize(100, 100);
        disp += 10;
        jif.setVisible(true);
      }
    };
    newFrame.addActionListener(listener);

    gui.add(newFrame, BorderLayout.PAGE_START);

    JFrame f = new JFrame();
    f.add(gui);
    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    f.setLocationByPlatform(true);

    f.pack();
    f.setVisible(true);
  }
}