[Encapsulating Data] The synthesized methods follow specific naming conventions: The method used to access the value (the getter method) has the same name as the property. The getter method for a property called firstName will also be called firstNam…

Objective-C中类的封装本质上其他OO语言没什么区别,不过在概念和书写表达上差异还是比较大的, Property属性 这里的Property并不是简单的类成员变量,而是OC中特有的可以为编译器识别并自动生成取值函数的一个东西,可以理解为时加强的成员变量,他会自动生成getter.setter @interface XYZPerson : NSObject @property NSString *firstName; @property NSString *lastName; @end 比…

Most Properties Are Backed by Instance Variables By default, a readwrite property will be backed by an instance variable, which will again be synthesized automatically by the compiler. An instance variable is a variable that exists and holds its valu…

Designated Initializer 不稳定的传送门 合成属性 Properties don’t always have to be backed by their own instance variables. As an example, the XYZPerson class might define a read-only property for a person’s full name: @property (readonly) NSString *fullName; Rat…

Motivation Spark是基于Hadoop可用的生态系统构建的,因此Spark可以通过Hadoop MapReduce的InputFormat和OutputFormat接口存取数据. Spark所提供的上层接口有这几类: File formats and filesystems: 对于存储在本地或分布式系统的数据,比如NFS,HDFS,Amazon S3.Spark可以访问多种数据格式,包括text,JSON,SequenceFiles,protocol buffers. Structu…

编程作业五 作业链接:Burrows-Wheeler Data Compression & Checklist 我的代码:MoveToFront.java & CircularSuffixArray.java & BurrowsWheeler.java 问题简介 Burrows-Wheeler 数据压缩算法包括三个部分:Burrows-Wheeler transform,Move-to-front encoding 和 Huffman compression,前面两个部分把文本转换…

  Programming with Objective-C Encapsulating Data In addition to the messaging behavior covered in the previous chapter, an object also encapsulates data through its properties. 除了前一章讲述的消息方法(messaging behavior), 对象还能通过它的特性(properties)来封装数据. This chap…

苹果官方文档:不稳定的传送门 读书笔记共有以下几篇,其他的知识点不重要或者已经熟悉不需记录 <Programming with Objective-C>第三章 Working with Objects <Programming with Objective-C>第四章 Encapsulating Data <Programming with Objective-C>第五章 Customizing Existing Classes <Programming with…

About Objective-C Objective-C is the primary programming language you use when writing software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the…

ABSTRACT Recent technological advancement have led to a deluge of data from distinctive domains (e.g., health care and scientific sensors, user-generated data, Internet and financial companies, and supply chain systems) over the past two decades. The…