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about story:诸葛亮锦囊妙计

妙计接口：

public interface IStrategy{ public void operate(); }

第一个妙计：

public class StrategyFirst implements IStrategy{

public void operate(){

system.out.println("找乔国老帮忙");

}

}

第二个妙计：

pubilc class StrategySecond implements IStrategy{

public void operate(){

system.out.println("找何仙姑帮忙");

}

}

 

锦囊：

public class Context{

private IStrategy strategy;

public Context(IStrategy strategy_){

this.strategy=strategy_;

}

public void action(){

this.strategy.operate();

}

}

 

场景类：

public class ZhaoYun{

public static void main(String[] args){

Context context1=new Context(new StrategyFirst());

context1.action();

Context context2=new Context(new StrategySecond());

context2.action();

}

}