package com.jmj.pattern.strategy;public interface Strategy {void show();
}

package com.jmj.pattern.strategy;public class StrategyA implements Strategy{@Overridepublic void show() {System.out.println("买一送一");}
}

package com.jmj.pattern.strategy;public class StrategyB implements Strategy{@Overridepublic void show() {System.out.println("买两百减五十");}
}

package com.jmj.pattern.strategy;public class StrategyC implements Strategy{@Overridepublic void show() {System.out.println("满1000加一元");}
}

package com.jmj.pattern.strategy;public class SalesMan {private Strategy strategy;public SalesMan(Strategy strategy) {this.strategy = strategy;}public void salesManshow(){strategy.show();}}

package com.jmj.pattern.strategy;public class Client {public static void main(String[] args) {SalesMan salesMan = new SalesMan(new StrategyA());salesMan.salesManshow();}
}