public class JApplet extends    Applet
                     implements Accessible,
                                RootPaneContainer

java.lang.Object
          java.awt.Component
                   java.awt.Container
                            java.awt.Panel
                                     java.applet.Applet
                                                 javax.swing.JApplet

public class JFrame extends    Frame
                    implements WindowConstants,
                               Accessible,
                               RootPaneContainer

java.lang.Object
          java.awt.Component
                   java.awt.Container
                            java.awt.Window
                                     java.awt.Frame
                                              javax.swing.JFrame

public class JPanel extends    JComponent
                    implements Accessible

java.lang.Object
          java.awt.Component
                   java.awt.Container
                            javax.swing.JComponent
                                        javax.swing.JPanel

	getContentPane(), setContentpane()
	BorderLayout()
	...