容器和包装纸之间的区别 [英] Difference between container and wrapper

问题描述

在一种编程语言（例如Java）中，容器和包装器有什么区别（或者是否有区别）。我听说过两个词都含糊不清。

In a programming language (e.g. Java), what's the difference between container and wrapper (or is there a difference). I've heard both the terms used vaguely.

推荐答案

在编程语言中，容器一词通常用于包含多个元素的结构，例如 Map ， Set 或 List 。这些结构通常提供 contains 之类的方法，如果对象可以包含多个项目，则在语义上是合适的。

In programming languages the word container is generally used for structures that can contain more than one element, for example a Map, a Set or a List. These structures normally provide methods like contains, that are semantically suitable if the object can contain more than one item.

相反，包装器是包裹单个对象以提供更多功能和接口的东西。典型示例是 Integer 类，该类在Java中包装了基本类型 int 。

A wrapper instead is something that wraps around a single object to provide more functionalities and interfaces to it. The typical example is the Integer class that in Java wraps the base type int.

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