Java设计模式-----Factory Method模式

public abstract class Ball {
protected  abstract  void play();
}

public class Basketball extends Ball {

protected void play() {
System.out.println("play the basketball");
}
}

public class Football extends Ball {

protected void play() {
System.out.println("play the football");
}
}

public abstract class BallFactory {
protected  abstract Ball makeBall();
}

public class BasketballFact extends BallFactory {

protected Ball makeBall() {
return new Basketball();
}
}

public class FootballFact extends BallFactory {

protected Ball makeBall() {
return new Football();
}
}

public class Client {

public static void main(String[] args) {

BallFactory ballFactory = new BasketballFact();
Ball basketball = ballFactory.makeBall();
basketball.play();

ballFactory = new FootballFact();
Ball football = ballFactory.makeBall();
football.play();
}
}