hashmap Java 的相关内容

深入理解HashMap：Java中的键值对存储利器

HashMap是Java中常用的数据结构之一，它提供了一种键值对的存储机制，适用于快速查找和检索。本文将深入探讨HashMap的概念、内部结构、工作原理以及在多线程环境下的一些问题。1. HashMap的概念HashMap是Java中的一种数据结...

HashMap找最大值对应的哪一个键java

public static String getProcessCdByName(HashMap<String, Integer> processMap){//我找最大值对应的哪一个键 int max=0; for (Integer in : processMap.values()) { ...

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【底层原理之旅—HashMap深入浅出的源码分析（JDK1.7版本）】｜Java 开发实战

概念回顾HashMap由数组+链表组成的，数组是HashMap的主体，链表则是主要为了解决哈希冲突而存在的，如果定位到的数组位置不含链表（当前entry的next指向null），那么对于查找，添加等操作很快，仅需一次寻址即可；如果定位到的数组包含链表，...

【底层原理之旅—HashMap深入浅出的源码分析（JDK1.8版本）】｜Java 刷题打卡

题目HashMap深入浅出的源码分析知识点HashMap是一个基于map接口实现的散列表，存储内容是键值对 (key-value) 映射，并且键和值都可以使用null，因为key不允许重复，因此只能有一个键为null。HashMap使用 hash 算法进行数据的存储和查询。HashMap的实现用的是...

HashMap源码解读—Java8版本（下）

七、阿里面试实战7.1、为什么需要散列表HashMap中的数据结构为散列表，又名哈希表。在这里我会对散列表进行一个简单的介绍，在此之前我们需要先回顾一下数组、链表的优缺点。数组：数组删除、插入性能不佳，寻址性能极优链表：链表查询性能不佳，删除、插入性能极优数组的优缺点取决于他们在内存中存储的模式...

HashMap源码解读—Java8版本（中）

五、构造方法HashMap 共提供了 4 种构造方法，满足各种常见场景下对容量的需求 // 第1种：创建一个 HashMap 并指定容量(initialCapacity) 和装载因子(loadFactor) public HashMap(int initialCapacity, float lo...

HashMap源码解读—Java8版本（上）

一、HashMap简介HashMap顶部有一段很长的注释，大概的介绍了HashMap。1.1 原文/** * Hash table based implementation of the <tt>Map</tt> interface. This * implementatio...

面试必问系列：手动实现一个 HashMap｜Java 刷题打卡

题目描述这是 LeetCode 上的706. 设计哈希映射。不使用任何内建的哈希表库设计一个哈希映射（HashMap）。实现 MyHashMap 类：MyHashMap() 用空映射初始化对象void put(int key, int value) 向 HashMap 插入一个键值对 (key, v...

JDK11源码--HashMap源码分析

@[toc] 概述本文介绍JDK11中HashMap的源码实现。 hashmap数据结构 map中存储的是key,value键值对。众所周知，hashmap是采用的 ==数组 + 链表 + 红黑树== 的数据结构存储数据的：上图中，左侧方形表示的是数组，初始化状态长度是16。数组中每个元素我们这...

集合源码解析之HashMap(基于Java8)

1 概述 HashMap是基于哈希表实现的,每一个元素是一个key-value对,其内部通过单链表解决冲突问题,容量不足(超过了阀值)时,同样会自动增长. HashMap是非线程安全的,只适用于单线程环境下,多线程环境下可以采用concurrent并发包下的concurrentHashMap. Ha...

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