/* * To change this template, choose Tools | Templates * and open the template in the editor. */package com.shopping.model;import com.shopping.dao.CategoryDAO;import com.shopping.dao.CategoryFactory;import java.util.List;/** * * @author Administrator */public class CategoryService {   private static CategoryDAO dao;   private static CategoryService instance = null;   private CategoryService(){       dao = CategoryFactory.getDao();   }      public static CategoryService getInstance(){     if(instance == null){        instance = new CategoryService();     }     return instance;   }         //.................   public  int save(Category c){      return dao.save(c);   }    public List<Category> getCategorys(){     return dao.getCategorys();   }     public void addChildCategory(int pid, String cname, String cdescr,int grade){  dao.addChildCategory(pid, cname, cdescr, grade);  }      public void delete(int id,int pid){   dao.delete(id, pid);   }}