集合和列表有什么区别?

问题描述

Set<E>和List<E>接口的根本区别是什么?

What is the fundamental difference between the Set<E> and List<E> interfaces?

推荐答案

List 是一个有序的元素序列，而 Set 是一个不同的无序元素列表(谢谢，奎因·泰勒).

List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered (thank you, Quinn Taylor).

List<E>:

有序集合(也称为顺序).该界面的用户有精确的控制在哪里列出每个插入的元素.这用户可以通过他们的访问元素整数索引(列表中的位置)，并在列表中搜索元素.

An ordered collection (also known as a sequence). The user of this interface has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.

Set<E>:

一个集合不包含重复元素.更正式地说，集合不包含元素对 e1和 e2 使得 e1.equals(e2)，并且在最多一个空元素.正如所暗示的那样它的名字，这个接口模拟了数学集合抽象.

A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.

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