java中集合框架的需求是什么？ [英] What is the need of collection framework in java?

问题描述

Java中对Collection框架的需求是什么，因为所有数据操作（排序/添加/删除）都可以使用Arrays，而且数组适合于内存消耗，并且与Collections相比性能也更好。

What is the need of Collection framework in Java since all the data operations(sorting/adding/deleting) are possible with Arrays and moreover array is suitable for memory consumption and performance is also better compared with Collections.

有人能指出一个实时数据导向的例子，它显示了这些实现的两个（数组/集合）的差异。

Can anyone point me a real time data oriented example which shows the difference in both(array/Collections) of these implementations.

推荐答案

• 数组不可调整大小。


• Java Collections Framework提供了许多不同的有用数据类型，例如作为链接列表（允许在恒定时间内任意位置插入），可调整大小的数组列表（如 Vector 但更酷），红黑树，基于哈希的映射（如 Hashtable 但更酷）。


• Java Collections Framework提供抽象，因此您可以将列表称为 List ，是否由数组列表或链表支持;并且您可以将地图/字典称为地图，无论是由红黑树还是哈希表支持。


• Arrays are not resizable.
• Java Collections Framework provides lots of different useful data types, such as linked lists (allows insertion anywhere in constant time), resizeable array lists (like Vector but cooler), red-black trees, hash-based maps (like Hashtable but cooler).
• Java Collections Framework provides abstractions, so you can refer to a list as a List, whether backed by an array list or a linked list; and you can refer to a map/dictionary as a Map, whether backed by a red-black tree or a hashtable.

换句话说，Java Collections Framework允许您使用正确的数据结构，因为一个大小并不适合所有。

In other words, Java Collections Framework allows you to use the right data structure, because one size does not fit all.

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