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Foundation类层次的根是NSObject类，它（和NSObject及NSCopying协议一起）定义了基本的对象属性和行为。Foundation框架的剩余部分由几组相互关联的类和一些独立的类组成。有一些代表基本数据类型的类，如字符串、字节数组、用于存储其它对象的集合类；一些代表系统信息的类，如日期类；还有一些代表系统实体的类，比如端口、线程、和进程。图1、图2、和图3所示的类层次描述了这些类的逻辑分组及其继承关系。

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Fully revised to cover the latest standards and technologies, XML and Java(TM), Second Edition provi

Fully revised to cover the latest standards and technologies, XML and Java(TM), Second Edition provides the practical solutions developers need to des...

📅 2014-01-05 👤 hj_18

technologies and standards Edition

This program is free software you can redistribute it and/or modify it under the terms of the GNU G

This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free So...

📅 2013-12-28 👤 thesk123

redistribute the software program

This program is free software you can redistribute it and/or modify it under the terms of the GNU G

This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free So...

📅 2017-02-07 👤 小鹏

redistribute the software program

This program is free software you can redistribute it and/or modify it under the terms of the GNU G

This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free So...

📅 2017-02-07 👤 天涯

redistribute the software program

This program is free software you can redistribute it and/or modify it under the terms of the GNU G

This program is free software you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free So...

📅 2017-02-07 👤 cc1

redistribute the software program