设计模式阅读备忘笔记-策略模式

设计模式阅读备忘笔记-策略模式

abstract class Strategy
{
// 算法抽象
public abstract void AlgorithmInterface();
}

class ConcretesStrategyA : Strategy
{
public override void AlgorithmInterface()
{
//实现算法A
}
}
class ConcretesStrategyB : Strategy
{
public override void AlgorithmInterface()
{
//实现算法B
}
}

//对外接口,不变
class Context
{
Strategy strategy;
//用一个具体算法对象来配置Strategy
public Context(Strategy strategy)
{
this.strategy = strategy;
}

//对外具体算法接口
public void ContextInterface()
{
strategy.AlgorithmInterface();
}
}

//外部调用例子
class SomeWhere {
public void DoSomeThing()
{
Context context;
//调用算法A
context = new Context(new ConcretesStrategyA());
context.ContextInterface();
//调用算法B
context = new Context(new ConcretesStrategyB());
context.ContextInterface();
}
}