Java面试题原理的相关内容

最经典的一道JAVA面试题：谈谈你对Kafka零拷贝原理的理解

最近一位3年工作经验的小伙伴去某厂面试，被问到这样一个问题，说：”请你简单说一下Kafka的零拷贝原理“。然后，这位小伙伴突然愣住了，什么是零拷贝，零拷贝跟Kafka有关系吗？那么今天，我给大家来聊一聊我对Kafka零拷贝原理的理解。另外，我把往期分享的视频全部整理成...

Java 最常见的面试题：说一下 atomic 的原理？

Atomic包中的类基本的特性就是在多线程环境下，当有多个线程同时对单个（包括基本类型及引用类型）变量进行操作时，具有排他性，即当多个线程同时对该变量的值进行更新时，仅有一个线程能成功，而未成功的线程可以向自旋锁一样，继续尝试，一直等到执行成功。Atomic系列的类中的核心方法都会调用unsafe类...

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Java 最常见的面试题：说一下 synchronized 底层实现原理？

synchronized可以保证方法或者代码块在运行时，同一时刻只有一个方法可以进入到临界区，同时它还可以保证共享变量的内存可见性。Java中每一个对象都可以作为锁，这是synchronized实现同步的基础：普通同步方法，锁是当前实例对象静态同步方法，锁是当前类的class对象同步方法块，锁是括号...

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 synchronized底层实现原理？它与lock相比有什么优缺点？

首先那些说看过synchronized源码的基本都是大聪明，synchronized根本点不进去，想弄懂它的实现原理，我们只能通过看编译好的字节码文件原理：基于对象的监视器（ObjectMonitor），我们在字节码文件里面可以看到，在同步方法执行前后，有两个指令...

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