Java 3D Desktop Environment旨在使用Java 3D来创建一个3D桌面环境。功能包括：分布式的应用程序

				package org.j3de.ui;
				
				import javax.swing.event.ChangeListener;
				
				import javax.media.j3d.BranchGroup;
				import javax.media.j3d.Node;    
				
				import org.j3de.ui.UIElementMapper;
				
				public abstract class LayoutManager3D extends BranchGroup {
				  public abstract void   add(UIElement element);
				  public abstract void   remove(UIElement element);      
				
				  public abstract void   setElementMapper(UIElementMapper elementMapper);
				
				  /** Add a ChangeListener, that is notified, when the Bounds of the UIElement change. */
				  public abstract void addBoundsChangeListener(ChangeListener listener);
				
				  /** Remove a ChangeListener, that is notified, when the Bounds of the UIElement change. */
				  public abstract void removeBoundsChangeListener(ChangeListener listener);
				 
				}