策略模式

策略模式就是定义一系列的算法，把他们一个一个封装起来，并使他们可以相互替换。也就是实现算法和调用端的解耦，他的核心并不是如何实现算法而是如何组织，调用这些算法。下面是个demo：

package com.jerry.design.strategy; // 测试类 public class Test { public static void main(String[] args) { ConcreteStrategyA concreteStrategyA = new ConcreteStrategyA(); Context context = new Context(concreteStrategyA); context.doSomething(); } } interface Strategy { public void doSomething(); } class ConcreteStrategyA implements Strategy{ @Override public void doSomething() { System.out.println("ConcreteStrategyA的doSomething()"); } } class ConcreteStrategyB implements Strategy{ @Override public void doSomething() { System.out.println("ConcreteStrategyB的doSomething()"); } } class Context{ private Strategy strategy; public Context(Strategy strategy) { super(); this.strategy = strategy; } public void doSomething(){ strategy.doSomething(); } }