策略模式：
publicinterface Strategy {
publicdouble calcPrice(double goodsPrice);
}
publicclass NormalCustomerStrategy implements Strategy{
@Override
publicdouble calcPrice(double goodsPrice) {
// TODO Auto-generated method stub
System.out.println("对于新的顾客暂时无折扣.....");
return goodsPrice;
}
}
publicclass OldCustomerStrategy implements Strategy {
@Override
publicdouble calcPrice(double goodsPrice) {
// TODO Auto-generated method stub
System.out.println("对于老顾客折扣为5%");
return goodsPrice*(1-0.05);
}
}
publicclass LargeCustomerStrategy implements Strategy{
@Override
publicdouble calcPrice(double goodsPrice) {
// TODO Auto-generated method stub
System.out.println("对于大客户我们的折扣是10%");
return goodsPrice*(1-0.10);
}
}
publicclass Price {
private Strategy strategy;
public Price(Strategy strategy){
this.strategy=strategy;
}
publicdouble quote(double goodsPrice){
returnthis.strategy.calcPrice(goodsPrice);
}
}
publicclass Test {
publicstaticvoid main(String[] args){
Strategy strategy1=new LargeCustomerStrategy();
Price p1=new Price(strategy1);
double quote=p1.quote(1000);
System.out.println("想客户报价为："+quote);
System.out.println("...................");
Strategy strategy2=new OldCustomerStrategy();
Price p2=new Price(strategy2);
double quote1=p2.quote(1000);
System.out.println("想客户报价为："+quote1);
System.out.println("...................");
Strategy strategy3=new NormalCustomerStrategy();
Price p3=new Price(strategy3);
double quote2=p2.quote(1000);
System.out.println("想客户报价为："+quote2);
}
}
运行结果如下：