selldetailsbo.java

java网上订餐系统java网上订餐系统java网上订餐系统

package com.bo;

import java.util.ArrayList;

import com.dao.SellDetailsDao;

public class SellDetailsBo {

	private SellDetailsDao sellDao = new SellDetailsDao();
	private static SellDetailsBo sellDetailsBo = null;
	//单例,一个无参的且私有的构造
	private SellDetailsBo(){}
	public SellDetailsBo createSellDetailsBo(){
		if(sellDetailsBo==null){
			sellDetailsBo = new SellDetailsBo();
		}
		return sellDetailsBo;
	}
	public ArrayList selectSellDetailsInfo(){
		return (ArrayList) sellDao.selectInfo();
	}
}