java的Strategy模式设计应用--小型电子商务系统简单模拟

package cn.com.xujia.firstproject; public class SaleOrder { private String productName=null; private long itemNum=0; private double price=0.0; private Account cosAccount=null; public Account getAccount(){ return this.cosAccount; } public SaleOrder(String productName, long itemNum, double price, Account cosAccount){ this.itemNum=itemNum; this.price=price; this.productName=productName; this.cosAccount=cosAccount; } //用来计算顾客的会员积分: public void computerScore(CalcTax taxToUse){ double origScore=cosAccount.getCosScore(); int VIP_Grade=cosAccount.getVIP(); VIP_Rules vip_rules=null; double sumMoney=paidMoney(taxToUse); switch(VIP_Grade){ case 0:vip_rules=new VIP0_Rules();break; case 1:vip_rules=new VIP1_Rules();break; case 2:vip_rules=new VIP2_Rules();break; case 3:vip_rules=new VIP3_Rules();break; } vip_rules.VIP_Process(sumMoney); } //用来处理定单的税务的方法: public double taxProcess(CalcTax taxToUse){ return taxToUse.taxAmount(productName,itemNum, price); } //计算顾客定单的应付的总金额: public double paidMoney(CalcTax taxToUse){ return this.taxProcess(taxToUse)+itemNum*price; } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub } }