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【Java学习笔记】：集合框架 · 初体验

1、写在前面大家好，今天文章的内容是：集合框架2、集合框架2.1、简述什么是集合框架？在数学中，集合一般被定义为：由一个或多个确定的元素所构成的整体。而在Java中，集合就是可以将多个对象收集到一起，并作为一个对象而存储的容器。由于集合框架的设计必须是高性能的，允许不同类型的集合存在，并且扩展性高的...

Java学习笔记 12、集合框架（二）

LinkedHashSetLinkedHashSet：是HashSet的子类，无相关自己实现的类。其中实际上使用的是LinkedHashMap(同样是HashMap子类)，能够顺序访问插入进来的数。底层使用的是数组+双向链表形式，其中访问数据都是有序的。如下图清晰看出为什么能够顺序访问存储的数据：要...

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Java学习笔记 12、集合框架（一）

一、认识集合框架引言前言：为了方便对对象操作，我们会将多个对象集合到一起，再没学习使用集合之前我们使用的是数组来存储对象，而使用数组存储对象的话有着许多的弊端，例如我们想直接添加一个对象或是删除、修改一个对象使用数组只能通过下标来对数组进行操作，比较有局限性。数组只给我们提供了length()、cl...

Java 核心技术学习笔记— Java集合框架部分内容#yyds干货盘点#

Java 最初版本只提供了最初的几个 Java 集合框架个类：VectorStackHashableBitSetEnumeration其中 Enumeration 接口提供了一种用于访问任意容器中各个元素的抽象机制。Java 集合类库将接口（ interface ）与实现（implementati...

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