concurrenthashmap并发

ConcurrentHashMap 并发哈希映射

图1-1 hashtable中在put()方法上加锁 1.2ConcurrentHashMap的锁分段技术 HashTable容器在竞争激烈的并发环境下表现出效率低下的原因，是因为所有访问HashTable的线程都必须竞争同一把锁。那假如容器里有多把锁，每一把锁用于锁容器其中一...

java-并发-ConcurrentHashMap高并发机制-jdk1.6

ConcurrentHashMap 是 util.concurrent 包的重要成员。本文将结合 Java 内存模型，分析 JDK 源代码，探索 ConcurrentHashMap 高并发的具体实现机制。由于 ConcurrentHashMap 的源代码实现依赖于 Java 内存模型，所以阅读本文需要读者了解 ...

Java中的HashMap和ConcurrentHashMap的并发性能测试

先看看代码吧，模拟1000个并发，每个测试1000次操作，循环测试10轮。分别测试Put和Get操作import java.util.Collections;import java.util.HashMap;import java.util.Hashtable;import java.util.Map;import java.util.concurrent....

Java中的HashMap和ConcurrentHashMap的并发性能测试

Java并发编程之ConcurrentHashMap

一、什么是ConcurrentHashMap？ConcurrentHashMap是一种线程安全且高效的HashMap。二、为什么要引入ConcurrentHashMap？针对Key-Value类型的集合而言，HashMap不是线程安全的，无法在多线程或高并发情况下使用，而Hashtable虽然使用...

两个并发集合ConcurrentHashMap和CopyOnWriteArrayList知识点汇集

与HashMap不同的是，ConcurrentHashMap并不允许key或者value为null。2、ConcurrentHashMap在1.7里采用的是分段锁Segment,默认并发度是16，自定义并发度的时候是取值为大于等于自定义值的最小2的幂次方的数字，每一个Segment里存放的都是...

java-并发-ConcurrentHashMap高并发机制-jdk1.8

ConcurrentHashMap是conccurrent家族中的一个类，由于它可以高效地支持并发操作，以及被广泛使用，经典的开源框架Spring的底层数据结构就是使用ConcurrentHashMap实现的。与同是线程安全的老大哥HashTable相比，它已经更胜一筹，因此它的锁...

并发安全的 ConcurrentHashMap 实现原理详解

并发安全的 ConcurrentHashMap 实现原理详解哈希表是中非常高效，复杂度为O(1)的数据结构，在Java开发中，我们最常见到最频繁使用的就是HashMap和HashTable，但是在线程竞争激烈的并发场景中使用都不够合理。HashMap：先说HashMap，...

聊聊并发——深入分析ConcurrentHashMap

ConcurrentHashMap 是一个并发散列映射表的实现，它允许完全并发的读取，并且支持给定数量的并发更新。相比于 HashTable 和用同步包装器包装的 HashMap（Collections.synchronizedMap(new HashMap())），ConcurrentHashMap 拥有更高的并发...

深入理解并发容器-ConcurrentHashMap(JDK8版本)

这篇文章主要分析Java5的3种并发集合类型（concurrent，copyonright，queue）中的ConcurrentHashMap，让我们从原理上细致的了解它们，能够让我们在项目开发中获益非浅,顺便斩获名企offer.有些方法需要跨段,比如size()和containsValue(),...

1 2 3 >

您可能感兴趣

.并发java .并发编程 .多线程并发 .并发线程 .并发问题 .并发loc .i/o并发 .并发into

{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":2,"count":2}]},"card":[{"des":"基于云服务强大的横向扩展能力，充沛的算力资源，轻松实现能够承载海量并发请求的坚固业务系统框架，业务高峰时期做到从容面对，轻松扩容。再业务高速扩张阶段提供便捷稳定可靠的基础资源框架。","link1":"https://www.aliyun.com/solution/growth-general/high-concurrency","link":"https://www.aliyun.com/solution/growth-general/high-concurrency","icon":"https://img.alicdn.com/imgextra/i3/O1CN01vcAvBT27iBu602lNl_!!6000000007830-2-tps-200-200.png","btn2":"立即咨询","tip":"更多优质解决方案 <a href=\"https://www.aliyun.com/solution/all \" target=\"_blank\"> 立即查看 <a href=\"https://page.aliyun.com/form/act1851795571/index.htm\" target=\"_blank\">立即咨询","btn1":"方案详情","link2":"https://page.aliyun.com/form/act1655674439/index.htm","title":"高并发云上架构解决方案"}],"search":[{"txt":"VMware云解决方案","link":"https://www.aliyun.com/solution/vmware/index"},{"link":"https://www.aliyun.com/solution/devops/yunxiao","txt":" DevOps解决方案"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"iconImg":"https://img.alicdn.com/imgextra/i1/O1CN014XEWEW1hMVB3Ydp04_!!6000000004263-0-tps-200-200.jpg","link3":"https://www.aliyun.com/solution/all","btn1":"方案详情","btn3":"查看更多方案","btn2":"立即咨询","ifIcon":"img","link":"https://www.aliyun.com/solution/growth-general/high-concurrency","contentLink":"https://www.aliyun.com/solution/growth-general/high-concurrency","link1":"https://www.aliyun.com/solution/growth-general/high-concurrency","title":"高并发云上架构解决方案","des":"基于云服务强大的横向扩展能力，充沛的算力资源，轻松实现能够承载海量并发请求的坚固业务系统框架，业务高峰时期做到从容面对，轻松扩容。再业务高速扩张阶段提供便捷稳定可靠的基础资源框架。","link2":"https://www.aliyun.com/core/online-consult?from=F9OmJ488XR","infoGroup":[{"infoName":"推荐搜索","infoContent":{"firstContentName":"Web/移动App云上部署","firstContentLink":"https://www.aliyun.com/solution/growth-general/web-oncloud","lastContentName":"数智化营销","lastContentLink":"https://www.aliyun.com/solution/growth-service/multi-marketing"}}]}]}

{"$env":{"JSON":{}},"$page":{"env":"production"},"$context":{"moduleinfo":{"card_count":[{"count_phone":1,"count":1}],"search_count":[{"count_phone":2,"count":2}]},"card":[{"des":"基于云服务强大的横向扩展能力，充沛的算力资源，轻松实现能够承载海量并发请求的坚固业务系统框架，业务高峰时期做到从容面对，轻松扩容。再业务高速扩张阶段提供便捷稳定可靠的基础资源框架。","link1":"https://www.aliyun.com/solution/growth-general/high-concurrency","link":"https://www.aliyun.com/solution/growth-general/high-concurrency","icon":"https://img.alicdn.com/imgextra/i3/O1CN01vcAvBT27iBu602lNl_!!6000000007830-2-tps-200-200.png","btn2":"立即咨询","tip":"更多优质解决方案 <a href=\"https://www.aliyun.com/solution/all \" target=\"_blank\"> 立即查看 <a href=\"https://page.aliyun.com/form/act1851795571/index.htm\" target=\"_blank\">立即咨询","btn1":"方案详情","link2":"https://page.aliyun.com/form/act1655674439/index.htm","title":"高并发云上架构解决方案"}],"search":[{"txt":"VMware云解决方案","link":"https://www.aliyun.com/solution/vmware/index"},{"link":"https://www.aliyun.com/solution/devops/yunxiao","txt":" DevOps解决方案"}],"countinfo":{"search":{"length_pc":0,"length":0},"card":{"length_pc":0,"length":0}},"simplifiedDisplay":"newEdition","newCard":[{"iconImg":"https://img.alicdn.com/imgextra/i1/O1CN014XEWEW1hMVB3Ydp04_!!6000000004263-0-tps-200-200.jpg","link3":"https://www.aliyun.com/solution/all","btn1":"方案详情","btn3":"查看更多方案","btn2":"立即咨询","ifIcon":"img","link":"https://www.aliyun.com/solution/growth-general/high-concurrency","contentLink":"https://www.aliyun.com/solution/growth-general/high-concurrency","link1":"https://www.aliyun.com/solution/growth-general/high-concurrency","title":"高并发云上架构解决方案","des":"基于云服务强大的横向扩展能力，充沛的算力资源，轻松实现能够承载海量并发请求的坚固业务系统框架，业务高峰时期做到从容面对，轻松扩容。再业务高速扩张阶段提供便捷稳定可靠的基础资源框架。","link2":"https://www.aliyun.com/core/online-consult?from=F9OmJ488XR","infoGroup":[{"infoName":"推荐搜索","infoContent":{"firstContentName":"Web/移动App云上部署","firstContentLink":"https://www.aliyun.com/solution/growth-general/web-oncloud","lastContentName":"数智化营销","lastContentLink":"https://www.aliyun.com/solution/growth-service/multi-marketing"}}]}]}}