package com.xc.hotelmanager.hotel.control.proxy;import java.util.*;import com.xc.hotelmanager.hotel.model.*;import com.xc.hotelmanager.hotel.control.*;import com.xc.hotelmanager.hotel.exception.*;import java.lang.NullPointerException;import java.rmi.*;import com.xc.hotelmanager.hotel.control.session.SB_CustomerManager;public class CustomerManager {  static CustomerManager instance = null;  private SB_CustomerManager manager = null;  private CustomerManager() {    try {      manager =EjbGetter.getSB_CustomerManagerHome().          create();    }    catch (Exception ex) {    }  }  public static CustomerManager getInstance() {    if (instance == null) {      instance = new CustomerManager();    }    return instance;  }  public Customer loadCustomer(String cid) throws HotelManagerException {    Customer result = null;    try {      result = manager.loadCustomer(cid);    }    catch (Exception rex) {      throw new HotelManagerException("CustomerManager.load Eorr:"+rex.getMessage());    }    return result;  }  public Customer existCustomer(String cid) throws HotelManagerException {    Customer result = null;    try {      result = manager.exitCustomer(cid);    }    catch(java.lang.NullPointerException ex){      System.out.println("該顧客不存在----可不寫？？"+ex.getMessage());      result=null;    }    catch (Exception rex) {      if (result == null) {        result = null;      }      else {        throw new HotelManagerException("CustomerManager.exist Eorr:" +                                        rex.getMessage());      }    }    return result;  }    public Collection getAllCustomer() throws HotelManagerException {      try {        Collection result = manager.getAllCustomer();        return result;      }      catch (Exception rex) {        throw new HotelManagerException(rex.getMessage());      }    }    public void removeCustomer(String cid) throws HotelManagerException {      try {        manager.removeCustomer(cid);      }      catch (Exception rex) {        throw new HotelManagerException(rex.getMessage());      }    }    public Customer addCustomer(Customer cus) throws HotelManagerException {      try {        return manager.addCustomer(cus);      }      catch (Exception rex) {        throw new HotelManagerException("CustomerManager.add Eorr:"+rex.getMessage());      }    }    public Customer saveCustomer(Customer cus) throws HotelManagerException {      try {        return manager.saveCustomer(cus);      }      catch (Exception rex) {        throw new HotelManagerException("CustomerManager.save Eorr:"+rex.getMessage());      }    }    public static void main(String[] args) {      try {        CustomerManager m = CustomerManager.getInstance();      }      catch (Exception ex) {        System.out.println("CustomerManager.main Eorr:"+ex.getMessage());      }    }  }