Java 接口应用-策略模式

/*
 * 策略模式（strategy pattern），定义了一系列算法，将每一种算法封装起来可以相互替换使用
 */
public class TestCeLue {
	public static void main(String[] args) {
		UserService us = new UserService();
		us.setISave(new NetSave());
		us.save();
	}
}

//把可变的行为抽象出来
interface ISave{
	public abstract void save();
}

class FileSave implements ISave{
	public void save() {
		System.out.println("实现文件存储");
	}
}

class NetSave implements ISave{
	public void save() {
		System.out.println("实现网络存储");
	}
}

abstract class BaseService{
	private ISave iSave;
	public void setISave(ISave iSave) {
		this.iSave = iSave;
	}
	public void save() {
		System.out.println("检查数据合法性");
		iSave.save();
		System.out.println("数据保存成功");
	}
}

class UserService extends BaseService{
	
}