/**

 * 策略模式

 * @author TMAC-J

 * 根据环境的不同选择不同的策略，把策略用接口抽象出来

 */

public class StrategyPattern {

    interface Strategy{

        void operate();

    }

    public class StrategyA implements Strategy{

        @Override

        public void operate() {

            System.out.println("策略A");

        }

    }

    public class StrategyB implements Strategy{

        @Override

        public void operate() {

            System.out.println("策略B");

        }

    }

    public class Context{

        private Strategy strategy;

        public Context(Strategy strategy) {

            this.strategy = strategy;

        }

        public void operate(){

            strategy.operate();

        }

    }

    public void test(){

        Context context1 = new Context(new StrategyA());

        context1.operate();

        Context context2 = new Context(new StrategyB());

        context2.operate();

    }

}