StrategyPattern （策略模式）

/**
 * 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();
    }
 
}