Java面试题锁的相关内容

Java 最常见的面试题：redis 分布式锁有什么缺陷？

Redis分布式锁虽然在实现上简单易用，但是它也存在一些缺陷：死锁风险：在获取锁和释放锁之间可能存在异常情况，如获取锁后崩溃或释放锁时网络异常，这可能导致死锁的情况。为了解决这个问题，可以给锁设置超时时间，在一定时间内自动释放锁。竞争激烈时性能下降：当并发获取锁的线程较多时...

Java 最常见的面试题：说一下 mysql 的行锁和表锁？

MySQL的锁主要有行锁和表锁两种。行锁又分为共享锁（S锁）和排他锁（X锁）。一般的select语句，InnoDB不加任何锁，我们称之为快照读。通过加S锁和X锁的select语句或者插入/更新/删除操作，我们称之为当前读。特殊的说明是，以上的当前读，读取的都是记录的最新...

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JAVA基础JAVA中的几种基本数据类型是什么，各自占用多少字节。String类能被继承吗，为什么。String，Stringbuffer，StringBuilder的区别。ArrayList和LinkedList有什么区别。讲讲类的实例化顺序，比如父类静态数据，构造函数，字段，子类静...

【java常见的面试题】加锁的方式有哪些 ?

使用synchronized关键字使用Lock锁 synchronized和Lock有什么区别 ? 首先synchronized是Java内置关键字，在JVM层面，Lock是个Java类； synchronized 可以给类、方法、代码块加锁；而 lock 只能给代码块加锁。 synchroniz...

Java 最常见的面试题：多线程锁的升级原理是什么？

在Java中，锁共有4种状态，级别从低到高依次为：无状态锁，偏向锁，轻量级锁和重量级锁状态，这几个状态会随着竞争情况逐渐升级。锁可以升级但不能降级。锁升级的图示过程：

Java面试题之synchronized平台级锁和Lock实现的锁区别

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Java面试题之synchronized关键字原理以及锁相关

目录一、Java中锁的概念二、同步关键字synchronized特性1、锁消除示例2、锁粗化示例三、synchronized关键字原理1、关于Mark Word2、锁的状态变化(1) 无锁 → 轻量级锁(2) 轻量级锁 → 重量级锁(3) 关于偏向锁（加锁之后不解锁，针对单线程）(4) 完整的锁升级...

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