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Title: 吊打Java面试官之ConcurrentHashMap（线程安全的哈希表） | Java程序员进阶之路

Open Graph Title: 吊打Java面试官之ConcurrentHashMap（线程安全的哈希表）

Description: ConcurrentHashMap 是 Java 并发包 (java.util.concurrent) 中的一种线程安全的哈希表实现。它通过分段锁技术或更先进的并发控制技术，使得多个线程可以同时读写映射，从而提高了性能

Open Graph Description: ConcurrentHashMap 是 Java 并发包 (java.util.concurrent) 中的一种线程安全的哈希表实现。它通过分段锁技术或更先进的并发控制技术，使得多个线程可以同时读写映射，从而提高了性能

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Java并发编程

Opengraph URL: https://tobebetterjavaer.com/thread/ConcurrentHashMap.html

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一、前言	https://tobebetterjavaer.com/home.html
2.9 Java新特性	https://tobebetterjavaer.com/java8/
并发编程小册简介	https://tobebetterjavaer.com/thread/
Java多线程入门	https://tobebetterjavaer.com/thread/wangzhe-thread.html
获取线程的执行结果	https://tobebetterjavaer.com/thread/callable-future-futuretask.html
Java线程的6种状态	https://tobebetterjavaer.com/thread/thread-state-and-method.html
线程组和线程优先级	https://tobebetterjavaer.com/thread/thread-group-and-thread-priority.html
进程与线程的区别	https://tobebetterjavaer.com/thread/why-need-thread.html
线程的安全性问题	https://tobebetterjavaer.com/thread/thread-bring-some-problem.html
Java的内存模型（JMM）	https://tobebetterjavaer.com/thread/jmm.html
volatile关键字	https://tobebetterjavaer.com/thread/volatile.html
synchronized关键字	https://tobebetterjavaer.com/thread/synchronized-1.html
synchronized的四种锁状态	https://tobebetterjavaer.com/thread/synchronized.html
深入浅出偏向锁	https://tobebetterjavaer.com/thread/pianxiangsuo.html
乐观锁CAS	https://tobebetterjavaer.com/thread/cas.html
抽象队列同步器AQS	https://tobebetterjavaer.com/thread/aqs.html
锁分类和 JUC	https://tobebetterjavaer.com/thread/lock.html
重入锁ReentrantLock	https://tobebetterjavaer.com/thread/reentrantLock.html
ReentrantReadWriteLock	https://tobebetterjavaer.com/thread/ReentrantReadWriteLock.html
等待通知条件Condition	https://tobebetterjavaer.com/thread/condition.html
线程阻塞唤醒类LockSupport	https://tobebetterjavaer.com/thread/LockSupport.html
Java的并发容器	https://tobebetterjavaer.com/thread/map.html
ConcurrentHashMap	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html
ConcurrentLinkedQueue	https://tobebetterjavaer.com/thread/ConcurrentLinkedQueue.html
BlockingQueue	https://tobebetterjavaer.com/thread/BlockingQueue.html
CopyOnWriteArrayList	https://tobebetterjavaer.com/thread/CopyOnWriteArrayList.html
ThreadLocal	https://tobebetterjavaer.com/thread/ThreadLocal.html
线程池	https://tobebetterjavaer.com/thread/pool.html
ScheduledThreadPoolExecutor	https://tobebetterjavaer.com/thread/ScheduledThreadPoolExecutor.html
原子操作类Atomic	https://tobebetterjavaer.com/thread/atomic.html
魔法类 Unsafe	https://tobebetterjavaer.com/thread/Unsafe.html
通信工具类	https://tobebetterjavaer.com/thread/CountDownLatch.html
Fork/Join	https://tobebetterjavaer.com/thread/fork-join.html
生产者-消费者模式	https://tobebetterjavaer.com/thread/shengchanzhe-xiaofeizhe.html
沉默王二	https://tobebetterjavaer.com/about-the-author/
ConcurrentHashMap 的变化	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的变化
JDK 1.7	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#jdk-1-7
JDK 1.8	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#jdk-1-8
ConcurrentHashMap 的字段	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的字段
ConcurrentHashMap 的内部类	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的内部类
1、Node	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_1、node
2、TreeNode	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_2、treenode
3、TreeBin	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_3、treebin
4、ForwardingNode	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_4、forwardingnode
ConcurrentHashMap 的 CAS	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的-cas
1、tabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_1、tabat
2、casTabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_2、castabat
3、setTabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_3、settabat
ConcurrentHashMap 的方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的方法
构造方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#构造方法
initTable 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#inittable-方法
put 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#put-方法
get 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#get-方法
transfer 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#transfer-方法
size 相关的方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#size-相关的方法
ConcurrentHashMap 示例	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-示例
小结	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#小结
HashMap	https://javabetter.cn/collection/hashmap.html
synchronized 同步代码块	https://javabetter.cn/thread/synchronized-1.html
并发容器	https://javabetter.cn/thread/map.html
synchronized	https://javabetter.cn/thread/synchronized.html
CAS 无锁操作	https://javabetter.cn/thread/cas.html
ReentrantLock	https://javabetter.cn/thread/reentrantLock.html
这个我们前面也讲过了	https://javabetter.cn/thread/synchronized.html
ConcurrentHashMap 的变化	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的变化
JDK 1.7	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#jdk-1-7
ReentrantLock	https://javabetter.cn/thread/reentrantLock.html
JDK 1.8	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#jdk-1-8
HashMap	https://javabetter.cn/collection/hashmap.html
CAS	https://javabetter.cn/thread/cas.html
ConcurrentHashMap 的字段	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的字段
数组的大小总是为 2 的幂次方	https://javabetter.cn/collection/hashmap.html
CAS 算法	https://javabetter.cn/thread/cas.html
我们前面也讲过了	https://javabetter.cn/thread/cas.html
静态代码块	https://javabetter.cn/oo/static.html
ConcurrentHashMap 的内部类	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的内部类
1、Node	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_1、node
volatile 关键字	https://javabetter.cn/thread/volatile.html
2、TreeNode	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_2、treenode
3、TreeBin	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_3、treebin
4、ForwardingNode	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_4、forwardingnode
ConcurrentHashMap 的 CAS	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的-cas
1、tabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_1、tabat
2、casTabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_2、castabat
3、setTabAt	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#_3、settabat
ConcurrentHashMap 的方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-的方法
构造方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#构造方法
initTable 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#inittable-方法
put 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#put-方法
HashMap	https://javabetter.cn/collection/hashmap.html
get 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#get-方法
transfer 方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#transfer-方法
size 相关的方法	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#size-相关的方法
ConcurrentHashMap 示例	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#concurrenthashmap-示例
小结	https://tobebetterjavaer.com/thread/ConcurrentHashMap.html#小结
https://github.com/CL0610/Java-concurrency	https://github.com/CL0610/Java-concurrency/blob/master/14.%E5%B9%B6%E5%8F%91%E5%AE%B9%E5%99%A8%E4%B9%8BConcurrentHashMap(JDK%201.8%E7%89%88%E6%9C%AC)/%E5%B9%B6%E5%8F%91%E5%AE%B9%E5%99%A8%E4%B9%8BConcurrentHashMap(JDK%201.8%E7%89%88%E6%9C%AC).md
初念初恋-ConcurrentHashMap	https://juejin.cn/post/7064061605185028110
二哥的 Java 进阶之路	https://github.com/itwanger/toBeBetterJavaer
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