Eater

The Curious Case of ‘Welcome In’

Last year, I started to notice a particular phrase cheerfully uttered in my direction when I entered a store, hotel, restaurant, yoga studio — even the venerable halls of the JFK Delta SkyClub: ...
搜狐

ConcurrentHashMap 与 HashMap 的区别是什么？

HashMap是 Java中最常用的Map类型之一，它采用了哈希表的方式存储数据，具有快速的查找和插入速度。然而，它并不是线程安全的，如果多个线程同时对HashMap 进行读写操作，可能会导致数据不一致的问题。为了解决这个问题，Java提供了一个线程安全的Map 类型 ...
TechRepublic

Best Practices for Concurrency in Java

Learn about the best practices for concurrency in Java to ensure your multi-threaded applications are efficient, synchronized, and error-free. Concurrency in Java is the ability of multiple threads to ...
搜狐

从分段锁到 CAS：ConcurrentHashMap的进化之路

ConcurrentHashMap是Java中一个重要的并发容器，用于在多线程环境下安全地管理键值对数据。自Java 1.5版本以来，它一直在不断演进，不断优化性能和并发度。本文将深入探讨ConcurrentHashMap的设计演进，特别关注为什么在Java 8中放弃了分段锁，以及如何通过CAS（Compare ...
51CTO

为什么ConcurrentHashMap不允许插null？

在 Java 语言中，HashMap 这种单线程下使用的集合是可以设置 null 值的，而并发集合如 ConcurrentHashMap 或 Hashtable 是不允许给 key 或 value 设置 null 值的，这是 JDK 源码层面直接实现的，这样设计的目的主要是为了防止并发场景下的歧义问题。 在 Java 语言中 ...
GitHub

Infinite loop of ConcurrentHashMap in recursive scene caused by JDK-8062841

Under recursive scene of caffeine, we are experiencing deadlocks in caffeine version 2.9.0(java version is 1.8.0_152). at com.github.benmanes.caffeine.cache ...
GitHub

WeightCalculatorWebFilter.java ConcurrentHashMap NullPointerException

2022-04-29 17:41:35.017 INFO 1 --- [trap-executor-0] c.n.d.s.r.aws.ConfigClusterResolver : Resolving eureka endpoints via configuration at java.util.concurrent ...
TheServerSide

Fix these 10 common examples of the RuntimeException in Java

Runtime errors occur when something goes wrong in the normal execution of a program. When severe enough, these errors abruptly terminate an application. To help programmers both anticipate and recover ...