HashTables在Cocoa [英] HashTables in Cocoa

问题描述

HashTables / HashMaps是存在的数据结构中最有用的（如果不是最常见的）数据结构之一。因此，在Cocoa开始学习编程时，我调查的第一件事是如何创建，填充和读取哈希表中的数据。

HashTables/HashMaps are one of the most (if not the most) useful of data-structures in existence. As such, one of the first things I investigated when starting to learn programming in Cocoa was how to create, populate, and read data from a hashtable.

令我惊讶的是：我一直在阅读的所有文档Cocoa / Objective-C编程似乎没有解释这一点。作为一个使用java.util的Java开发人员，就像它是一个身体的函数：我完全困惑于这。

To my surprise: all the documentation I've been reading on Cocoa/Objective-C programming doesn't seem to explain this much at all. As a Java developer that uses "java.util" as if it were a bodily function: I am utterly baffled by this.

所以，如果有人可以提供给我一个

So, if someone could provide me with a primer for creating, populating, and reading the contents of a hashtable: I would greatly appreciate it.

推荐答案

NSDictionary 和 NSMutableDictionary ？

这里有一个简单的例子：

And here's a simple example:

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setObject:anObj forKey:@"foo"];
[dictionary objectForKey:@"foo"];
[dictionary removeObjectForKey:@"foo"];
[dictionary release];

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