工厂方法模式

PersonAction.java

public interface PersonAction {
    public void eat();
}

WomanEat.java

public class WomanEat implements PersonAction {
    @Override
    public void eat() {
        Log.i("msg","woman is eating");
    }
}

ManEat.java

public class ManEat implements PersonAction {
    @Override
    public void eat() {
        Log.i("msg","man is eating");
    }
}

Provider.java

public interface Provider {
    public PersonAction produce();
}

WomanFactory .java

public class WomanFactory implements Provider {
    @Override
    public PersonAction produce() {
        return new WomanEat();
    }
}

ManFactory.java

public class ManFactory implements Provider {
    @Override
    public PersonAction produce() {
        return new ManEat();
    }
}

具体使用如下：

ManFactory manFactory = new ManFactory();
PersonAction action = manFactory.produce();
action.eat();