【java设计模式】【行为模式Behavioral Pattern】策略模式Strategy Pattern

 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……");
     }
 }