JLayeredPane样本

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package dragTest;
import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;

public class JLayeredPaneSample {
public static void main(String args[]) {
    JFrame f = new JFrame("JDesktopPane Sample");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = f.getContentPane();
    JLayeredPane desktop = new JDesktopPane();
    desktop.setOpaque(false);
    desktop.add(createLayer("Open 1"), JLayeredPane.POPUP_LAYER);
    desktop.add(createLayer("Iconified"), JLayeredPane.DEFAULT_LAYER);
    desktop.add(createLayer("Open 2"), JLayeredPane.PALETTE_LAYER);
    content.add(desktop, BorderLayout.CENTER);
    f.setSize(300, 200);
    f.setVisible(true);
}

public static JInternalFrame createLayer(String label) {
return new SelfInternalFrame(label);
}

static class SelfInternalFrame extends JInternalFrame {
    public SelfInternalFrame(String s) {
      getContentPane().add(new JLabel(s), BorderLayout.CENTER);
      setBounds(50, 50, 100, 100);
      setResizable(true);
      setClosable(true);
      setMaximizable(true);
      setIconifiable(true);
      setTitle(s);
      setVisible(true);
    }
}
}