interface Operate{
	void save();
	void upload();
	void remove();
}

class OperateByDb implements Operate{}
class OperateBySystem implements Operate{}

interface DataManager{
	abstract void save();
	abstract void upload();
	abstract void remove();
}

class PicManager implements DataManager{
	final Operate operate;
	public DataManager(Operate operate){
		this.operate=operate;
	}
	void save(){
		//get pic;
		//fill pic's property
		operate.save();
	}
	//...
}
class BookManager implements DataManager{}
class Client{
	void doThat(){
		new PicManager(new OperateByDb()).save();
	}
}