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.client;
				
				import java.util.Enumeration;
				
				import org.j3de.interfaces.Application;
				
				public abstract class AbstractClientFactory {
				
				  private static AbstractClientFactory clientFactory;
				
				  public AbstractClientFactory() {
				    clientFactory = this;
				  }
				
				  public abstract Application getConfiguration();
				  public abstract Enumeration getStartupApplications();
				
				  public static AbstractClientFactory getFactory() {
				    if (clientFactory == null)
				      throw new IllegalStateException("No ClientFactory has been instantiated");
				
				    return clientFactory;
				  }
				
				}