Java 接口应用-策略模式

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/*  * 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{       }