Java面试原理的相关内容

Java 最常见的面试题：说一下 JSONP 实现原理？

jsonp 即 json+padding，动态创建script标签，利用script标签的src属性可以获取任何域下的js脚本，通过这个特性(也可以说漏洞)，服务器端不在返货json格式，而是返回一段调用某个函数的js代码，在src中进行了调用，这样实现了跨域。

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...

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【Java面试】枚举从使用到原理

最近重新阅读《Java编程思想》与《Java编程逻辑》两本书时，读到了枚举章节，以前一直是使用，大概知道其原理，未进行过深入的总结。今天借这个机会，对枚举的那些事儿，我们详尽的梳理一下。1. 概念枚举是什么？被问到这个问题，用自己的大白话来说，就是Java定义的一种特殊的数据（注意：这里不是数据类型...

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...

Java常见面试题：ArrayList实现原理

ArrayList实现原理类集里面使用最多的就是ArrayList，使用ArrayList之前往往需要一些约定。ArrayList线性复杂度是1，可以直接通过索引进行访问。实际上这个过程和数组是非常相似的。 ArrayList在整个使用过程中如果想高效操作，那么最好设置一个数组的大小。在个数固定...

Java面试必问通信框架NIO，原理详解

NIO流与块通道与缓冲区缓冲区状态变量文件 NIO 实例选择器套接字 NIO 实例内存映射文件NIO与IO对比PathFilesNIO新的输入/输出 (NIO) 库是在 JDK 1.4 中引入的，弥补了原来的 I/O 的不足，提供了高速的、面向块的 I/O。 NIO核心组件: 通道(Channels...

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