import javax.swing.*;
import java.awt.BorderLayout;

public class JDesktopPaneTest3 extends JFrame{

  public static void main(String[] args){
    JDesktopPaneTest3 frame = new JDesktopPaneTest3();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  JDesktopPaneTest3(){
    JDesktopPane desktop = new JDesktopPane();

    JInternalFrame iframe1 = new JInternalFrame();
    iframe1.setSize(150, 100);
    iframe1.setLocation(10, 10);
    iframe1.setVisible(true);

    JInternalFrame iframe2 = new JInternalFrame();
    iframe2.setSize(150, 100);
    iframe2.setLocation(30, 30);
    iframe2.setVisible(true);

    desktop.add(iframe1);
    desktop.add(iframe2);

    getContentPane().add(desktop, BorderLayout.CENTER);
  }
}