package com.tn.策略模式;

 public class Client {

     private Strategy strategy;

     public void setStrategy(Strategy strategy){

         this.strategy=strategy;

     }

     public void exeAlgorithm() {

         strategy.exeAlgorithm();

     }

     public static void main(String[]args){

         Strategy strategy1=new ConcreteStrategy1();

         Strategy strategy2=new ConcreteStrategy2();

         Strategy strategy3=new ConcreteStrategy3();

         Client c=new Client();

         c.setStrategy(strategy1);

         c.exeAlgorithm();

         c.setStrategy(strategy2);

         c.exeAlgorithm();

         c.setStrategy(strategy3);

         c.exeAlgorithm();

     }

 }

 interface Strategy{

     void exeAlgorithm();

 }

 class ConcreteStrategy1 implements Strategy{

     @Override

     public void exeAlgorithm() {

         System.out.println("执行算法1……");

     }

 }

 class ConcreteStrategy2 implements Strategy{

     @Override

     public void exeAlgorithm() {

         System.out.println("执行算法2……");

     }

 }

 class ConcreteStrategy3 implements Strategy{

     @Override

     public void exeAlgorithm() {

         System.out.println("执行算法3……");

     }

 }