废话开篇

由于项目需要,需要对Java Collections进行系统地了解,所以在此记录下,方便自己,服务他人。

Java Collections 简介

Java Collections 框架主要包含interfaces, implementations, aggregate operations and algorithms四个部分,后续的文章也是从这四部分来分别介绍。

Java Collections定义

中文的百度上有,自己麻烦参考下吧,这里贴出官方定义:

A collections framework is a unified architecture for representing and manipulating collections. All collections frameworks contain the following:

  • Interfaces: These are abstract data types that represent collections. Interfaces allow collections to be manipulated independently of the details of their representation. In object-oriented languages, interfaces generally form a hierarchy.
  • Implementations: These are the concrete implementations of the collection interfaces. In essence, they are reusable data structures.
  • Algorithms: These are the methods that perform useful computations, such as searching and sorting, on objects that implement collection interfaces. The algorithms are said to be polymorphic: that is, the same method can be used on many different implementations of the appropriate collection interface. In essence, algorithms are reusable functionality.

废话收尾

有好多文章都说Java Collections Framework这么好那么好,其实我觉得就两点好:一是减少我们这些码农的敲击键盘的次数;二是以后的人能看懂咱们这些前人写的code。

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