本书介绍java语言基本语法的同时,结合实际给出了大量的实例

				package cmp2image;								import javax.naming.*;				import javax.rmi.PortableRemoteObject;				import java.util.*;								public class CatalogTestClient1 extends Object {				  private CatalogHome catalogHome = null;								  //Construct the EJB test client				  public CatalogTestClient1() {				    initialize();				  }								  public void initialize() {				    try {				      //get naming context				      Context context = getInitialContext();								      //look up jndi name				      Object ref = context.lookup("Catalog");				      //look up jndi name and cast to Home interface				      catalogHome = (CatalogHome) PortableRemoteObject.narrow(ref, CatalogHome.class);				      Catalog catalog = catalogHome.create();				       HashSet collection = catalog.findOne("AfricanOrchid");				        Iterator i = collection.iterator();				        Flower flower=null;				         System.out.println("Invento");				        while (i.hasNext()) {				         String  name = (String) i.next();				          System.out.println("flowerName: " + name);				        }								    }				    catch(Exception e) {				      e.printStackTrace();				    }				  }								  private Context getInitialContext() throws Exception {				    String url = "t3://zhb:7001";				    String user = null;				    String password = null;				    Properties properties = null;				    try {				      properties = new Properties();				      properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");				      properties.put(Context.PROVIDER_URL, url);				      if (user != null) {				        properties.put(Context.SECURITY_PRINCIPAL, user);				        properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);				      }								      return new InitialContext(properties);				    }				    catch(Exception e) {				      System.out.println("Unable to connect to WebLogic server at " + url);				      System.out.println("Please make sure that the server is running.");				      throw e;				    }				  }								  //----------------------------------------------------------------------------				  // Utility Methods				  //----------------------------------------------------------------------------								  public CatalogHome getHome() {				    return catalogHome;				  }				  //Main method								  public static void main(String[] args) {				    CatalogTestClient1 client = new CatalogTestClient1();				    // Use the getHome() method of the client object to call Home interface				    // methods that will return a Remote interface reference.  Then				    // use that Remote interface reference to access the EJB.				  }				}