java设计模式---策略模式

现在来地说说如何来实现策略模式（锦囊妙计）：
1、策略[妙计]实现接口（IStrategy）；
2、对应的策略实现类（*Strategy）；
3、封装策略的锦囊（StrategyContext）；
4、策略执行者（StrategyExecute）。

/*
*策略实现的接口
*/
public interface IStrategy{
//策略执行方法
    public void  operate();
}

public class FirstStrategy impelements IStrategy{
  public void operate(){
        system.out.printf("this is the first strategy");
    }
}

public class SecondStrategyimpelements IStrategy{
  public void operate(){
        system.out.printf("this is the second strategy");
    }
}

public class SecondStrategyimpelements IStrategy{
  public void operate(){
        system.out.printf("this is the third strategy");
    }
}

public class StrategyContext{
private IStrategy iStrategy;
public StrategyContext(IStrategy iStrategy){
this.iStrategy=iStrategy
}
public void doOperate(){
this.iStrategy.operate();
}
}

/**
*执行者
*/
public class StrategyExecute{
    public static void main(String[] args){
        StrategyContext context1=new StrategyContext(new FirstStrategy());
        context1.doOperate();//output: this is the first strategy
                StrategyContext context2=new StrategyContext(new SecondStrategy());
        context1.doOperate();//output: this is the second strategy
                StrategyContext context3=new StrategyContext(new ThirdStrategy());
        context1.doOperate();//output: this is the third strategy

    }
}