update

Author: Tyson0314

Java/JVM高频面试题.md

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-
-- [讲一下JVM内存结构？](#%E8%AE%B2%E4%B8%80%E4%B8%8Bjvm%E5%86%85%E5%AD%98%E7%BB%93%E6%9E%84)
-  - [程序计数器](#%E7%A8%8B%E5%BA%8F%E8%AE%A1%E6%95%B0%E5%99%A8)
-  - [虚拟机栈](#%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88)
-  - [本地方法栈](#%E6%9C%AC%E5%9C%B0%E6%96%B9%E6%B3%95%E6%A0%88)
-  - [堆](#%E5%A0%86)
-  - [方法区](#%E6%96%B9%E6%B3%95%E5%8C%BA)
-  - [运行时常量池](#%E8%BF%90%E8%A1%8C%E6%97%B6%E5%B8%B8%E9%87%8F%E6%B1%A0)
-  - [直接内存](#%E7%9B%B4%E6%8E%A5%E5%86%85%E5%AD%98)
-- [Java对象的定位方式](#java%E5%AF%B9%E8%B1%A1%E7%9A%84%E5%AE%9A%E4%BD%8D%E6%96%B9%E5%BC%8F)
-- [说一下堆栈的区别？](#%E8%AF%B4%E4%B8%80%E4%B8%8B%E5%A0%86%E6%A0%88%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [什么情况下会发生栈溢出？](#%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E4%BC%9A%E5%8F%91%E7%94%9F%E6%A0%88%E6%BA%A2%E5%87%BA)
-- [类文件结构](#%E7%B1%BB%E6%96%87%E4%BB%B6%E7%BB%93%E6%9E%84)
-- [什么是类加载？类加载的过程？](#%E4%BB%80%E4%B9%88%E6%98%AF%E7%B1%BB%E5%8A%A0%E8%BD%BD%E7%B1%BB%E5%8A%A0%E8%BD%BD%E7%9A%84%E8%BF%87%E7%A8%8B)
-- [什么是双亲委派模型？](#%E4%BB%80%E4%B9%88%E6%98%AF%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%A8%A1%E5%9E%8B)
-- [为什么需要双亲委派模型？](#%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE%E6%A8%A1%E5%9E%8B)
-- [什么是类加载器，类加载器有哪些?](#%E4%BB%80%E4%B9%88%E6%98%AF%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%E7%B1%BB%E5%8A%A0%E8%BD%BD%E5%99%A8%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [类的实例化顺序？](#%E7%B1%BB%E7%9A%84%E5%AE%9E%E4%BE%8B%E5%8C%96%E9%A1%BA%E5%BA%8F)
-- [如何判断一个对象是否存活？](#%E5%A6%82%E4%BD%95%E5%88%A4%E6%96%AD%E4%B8%80%E4%B8%AA%E5%AF%B9%E8%B1%A1%E6%98%AF%E5%90%A6%E5%AD%98%E6%B4%BB)
-- [可作为GC Roots的对象有哪些？](#%E5%8F%AF%E4%BD%9C%E4%B8%BAgc-roots%E7%9A%84%E5%AF%B9%E8%B1%A1%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [什么情况下类会被卸载？](#%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E7%B1%BB%E4%BC%9A%E8%A2%AB%E5%8D%B8%E8%BD%BD)
-- [强引用、软引用、弱引用、虚引用是什么，有什么区别？](#%E5%BC%BA%E5%BC%95%E7%94%A8%E8%BD%AF%E5%BC%95%E7%94%A8%E5%BC%B1%E5%BC%95%E7%94%A8%E8%99%9A%E5%BC%95%E7%94%A8%E6%98%AF%E4%BB%80%E4%B9%88%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB)
-- [GC是什么？为什么要GC？](#gc%E6%98%AF%E4%BB%80%E4%B9%88%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81gc)
-- [Minor GC 和 Full GC的区别？](#minor-gc-%E5%92%8C-full-gc%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [内存的分配策略？](#%E5%86%85%E5%AD%98%E7%9A%84%E5%88%86%E9%85%8D%E7%AD%96%E7%95%A5)
-- [Full GC 的触发条件？](#full-gc-%E7%9A%84%E8%A7%A6%E5%8F%91%E6%9D%A1%E4%BB%B6)
-- [垃圾回收算法有哪些？](#%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [有哪些垃圾回收器？](#%E6%9C%89%E5%93%AA%E4%BA%9B%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E5%99%A8)
-- [常用的 JVM 调优的命令都有哪些？](#%E5%B8%B8%E7%94%A8%E7%9A%84-jvm-%E8%B0%83%E4%BC%98%E7%9A%84%E5%91%BD%E4%BB%A4%E9%83%BD%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [对象头了解吗？](#%E5%AF%B9%E8%B1%A1%E5%A4%B4%E4%BA%86%E8%A7%A3%E5%90%97)
-- [main方法执行过程](#main%E6%96%B9%E6%B3%95%E6%89%A7%E8%A1%8C%E8%BF%87%E7%A8%8B)
-- [对象创建过程](#%E5%AF%B9%E8%B1%A1%E5%88%9B%E5%BB%BA%E8%BF%87%E7%A8%8B)
-- [如何排查 OOM 的问题？](#%E5%A6%82%E4%BD%95%E6%8E%92%E6%9F%A5-oom-%E7%9A%84%E9%97%AE%E9%A2%98)
-
-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
-> 首先给大家分享一个github仓库，上面放了**200多本经典的计算机书籍**，包括C语言、C++、Java、Python、前端、数据库、操作系统、计算机网络、数据结构和算法、机器学习、编程人生等，可以star一下，下次找书直接在上面搜索，仓库持续更新中~
->
-> github地址：https://github.com/Tyson0314/java-books
->
-> 如果github访问不了，可以访问gitee仓库。
->
-> gitee地址：https://gitee.com/tysondai/java-books
-
 ## 讲一下JVM内存结构？
 
 JVM内存结构分为5大区域，**程序计数器**、**虚拟机栈**、**本地方法栈**、**堆**、**方法区**。

Java/Java基础面试题.md

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-- [Java的特点](#java%E7%9A%84%E7%89%B9%E7%82%B9)
-- [Java 与 C++ 的区别](#java-%E4%B8%8E-c-%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [面向对象和面向过程的区别？](#%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1%E5%92%8C%E9%9D%A2%E5%90%91%E8%BF%87%E7%A8%8B%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [JKD和JRE的区别？](#jkd%E5%92%8Cjre%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [面向对象有哪些特性？](#%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1%E6%9C%89%E5%93%AA%E4%BA%9B%E7%89%B9%E6%80%A7)
-- [Java的基本数据类型有哪些？](#java%E7%9A%84%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [什么是值传递和引用传递？](#%E4%BB%80%E4%B9%88%E6%98%AF%E5%80%BC%E4%BC%A0%E9%80%92%E5%92%8C%E5%BC%95%E7%94%A8%E4%BC%A0%E9%80%92)
-- [自动装箱和拆箱](#%E8%87%AA%E5%8A%A8%E8%A3%85%E7%AE%B1%E5%92%8C%E6%8B%86%E7%AE%B1)
-- [String 为什么不可变？](#string-%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%8F%AF%E5%8F%98)
-- [String, StringBuffer 和 StringBuilder区别](#string-stringbuffer-%E5%92%8C-stringbuilder%E5%8C%BA%E5%88%AB)
-- [String 类的常用方法有哪些？](#string-%E7%B1%BB%E7%9A%84%E5%B8%B8%E7%94%A8%E6%96%B9%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [new String("dabin")会创建几个对象？](#new-stringdabin%E4%BC%9A%E5%88%9B%E5%BB%BA%E5%87%A0%E4%B8%AA%E5%AF%B9%E8%B1%A1)
-- [什么是字符串常量池？](#%E4%BB%80%E4%B9%88%E6%98%AF%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B8%B8%E9%87%8F%E6%B1%A0)
-- [object常用方法有哪些？](#object%E5%B8%B8%E7%94%A8%E6%96%B9%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [讲讲深拷贝和浅拷贝？](#%E8%AE%B2%E8%AE%B2%E6%B7%B1%E6%8B%B7%E8%B4%9D%E5%92%8C%E6%B5%85%E6%8B%B7%E8%B4%9D)
-- [两个对象的hashCode()相同，则 equals()是否也一定为 true？](#%E4%B8%A4%E4%B8%AA%E5%AF%B9%E8%B1%A1%E7%9A%84hashcode%E7%9B%B8%E5%90%8C%E5%88%99-equals%E6%98%AF%E5%90%A6%E4%B9%9F%E4%B8%80%E5%AE%9A%E4%B8%BA-true)
-- [Java创建对象有几种方式？](#java%E5%88%9B%E5%BB%BA%E5%AF%B9%E8%B1%A1%E6%9C%89%E5%87%A0%E7%A7%8D%E6%96%B9%E5%BC%8F)
-- [说说类实例化的顺序](#%E8%AF%B4%E8%AF%B4%E7%B1%BB%E5%AE%9E%E4%BE%8B%E5%8C%96%E7%9A%84%E9%A1%BA%E5%BA%8F)
-- [equals和==有什么区别？](#equals%E5%92%8C%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB)
-- [常见的关键字有哪些？](#%E5%B8%B8%E8%A7%81%E7%9A%84%E5%85%B3%E9%94%AE%E5%AD%97%E6%9C%89%E5%93%AA%E4%BA%9B)
-  - [static](#static)
-  - [final](#final)
-  - [this](#this)
-  - [super](#super)
-- [final, finally, finalize 的区别](#final-finally-finalize-%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [final关键字的作用？](#final%E5%85%B3%E9%94%AE%E5%AD%97%E7%9A%84%E4%BD%9C%E7%94%A8)
-- [方法重载和重写的区别？](#%E6%96%B9%E6%B3%95%E9%87%8D%E8%BD%BD%E5%92%8C%E9%87%8D%E5%86%99%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [接口与抽象类区别？](#%E6%8E%A5%E5%8F%A3%E4%B8%8E%E6%8A%BD%E8%B1%A1%E7%B1%BB%E5%8C%BA%E5%88%AB)
-- [常见的Exception有哪些？](#%E5%B8%B8%E8%A7%81%E7%9A%84exception%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [Error和Exception的区别？](#error%E5%92%8Cexception%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [运行时异常和非运行时异常（checked）的区别？](#%E8%BF%90%E8%A1%8C%E6%97%B6%E5%BC%82%E5%B8%B8%E5%92%8C%E9%9D%9E%E8%BF%90%E8%A1%8C%E6%97%B6%E5%BC%82%E5%B8%B8checked%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [throw和throws的区别？](#throw%E5%92%8Cthrows%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [BIO/NIO/AIO区别的区别？](#bionioaio%E5%8C%BA%E5%88%AB%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [守护线程是什么？](#%E5%AE%88%E6%8A%A4%E7%BA%BF%E7%A8%8B%E6%98%AF%E4%BB%80%E4%B9%88)
-- [Java支持多继承吗？](#java%E6%94%AF%E6%8C%81%E5%A4%9A%E7%BB%A7%E6%89%BF%E5%90%97)
-- [如何实现对象克隆？](#%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E5%AF%B9%E8%B1%A1%E5%85%8B%E9%9A%86)
-- [同步和异步的区别？](#%E5%90%8C%E6%AD%A5%E5%92%8C%E5%BC%82%E6%AD%A5%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [阻塞和非阻塞的区别？](#%E9%98%BB%E5%A1%9E%E5%92%8C%E9%9D%9E%E9%98%BB%E5%A1%9E%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [Java8的新特性有哪些？](#java8%E7%9A%84%E6%96%B0%E7%89%B9%E6%80%A7%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [什么是序列化和反序列化？](#%E4%BB%80%E4%B9%88%E6%98%AF%E5%BA%8F%E5%88%97%E5%8C%96%E5%92%8C%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96)
-- [如何实现序列化](#%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E5%BA%8F%E5%88%97%E5%8C%96)
-
-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
-> 首先给大家分享一个github仓库，上面放了**200多本经典的计算机书籍**，包括C语言、C++、Java、Python、前端、数据库、操作系统、计算机网络、数据结构和算法、机器学习、编程人生等，可以star一下，下次找书直接在上面搜索，仓库持续更新中~
->
-> github地址：https://github.com/Tyson0314/java-books
->
-> 如果github访问不了，可以访问gitee仓库。
->
-> gitee地址：https://gitee.com/tysondai/java-books
-
 ## Java的特点
 
 **Java是一门面向对象的编程语言。**面向对象和面向过程的区别参考下一个问题。

Java/Java并发面试题.md

@@ -1,57 +1,3 @@
-<!-- START doctoc generated TOC please keep comment here to allow auto update -->
-<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-
-
-- [线程池](#%E7%BA%BF%E7%A8%8B%E6%B1%A0)
-  - [为什么使用线程池？](#%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BD%BF%E7%94%A8%E7%BA%BF%E7%A8%8B%E6%B1%A0)
-  - [线程池执行原理？](#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E6%89%A7%E8%A1%8C%E5%8E%9F%E7%90%86)
-  - [线程池参数有哪些？](#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E5%8F%82%E6%95%B0%E6%9C%89%E5%93%AA%E4%BA%9B)
-  - [线程池大小怎么设置？](#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E5%A4%A7%E5%B0%8F%E6%80%8E%E4%B9%88%E8%AE%BE%E7%BD%AE)
-  - [线程池的类型有哪些？适用场景？](#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%9A%84%E7%B1%BB%E5%9E%8B%E6%9C%89%E5%93%AA%E4%BA%9B%E9%80%82%E7%94%A8%E5%9C%BA%E6%99%AF)
-- [进程线程](#%E8%BF%9B%E7%A8%8B%E7%BA%BF%E7%A8%8B)
-  - [线程的生命周期](#%E7%BA%BF%E7%A8%8B%E7%9A%84%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F)
-  - [讲讲线程中断？](#%E8%AE%B2%E8%AE%B2%E7%BA%BF%E7%A8%8B%E4%B8%AD%E6%96%AD)
-  - [创建线程有哪几种方式？](#%E5%88%9B%E5%BB%BA%E7%BA%BF%E7%A8%8B%E6%9C%89%E5%93%AA%E5%87%A0%E7%A7%8D%E6%96%B9%E5%BC%8F)
-  - [什么是线程死锁？](#%E4%BB%80%E4%B9%88%E6%98%AF%E7%BA%BF%E7%A8%8B%E6%AD%BB%E9%94%81)
-  - [线程死锁怎么产生？怎么避免？](#%E7%BA%BF%E7%A8%8B%E6%AD%BB%E9%94%81%E6%80%8E%E4%B9%88%E4%BA%A7%E7%94%9F%E6%80%8E%E4%B9%88%E9%81%BF%E5%85%8D)
-  - [线程run和start的区别？](#%E7%BA%BF%E7%A8%8Brun%E5%92%8Cstart%E7%9A%84%E5%8C%BA%E5%88%AB)
-  - [线程都有哪些方法？](#%E7%BA%BF%E7%A8%8B%E9%83%BD%E6%9C%89%E5%93%AA%E4%BA%9B%E6%96%B9%E6%B3%95)
-- [volatile底层原理](#volatile%E5%BA%95%E5%B1%82%E5%8E%9F%E7%90%86)
-- [synchronized的用法有哪些?](#synchronized%E7%9A%84%E7%94%A8%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [synchronized的作用有哪些？](#synchronized%E7%9A%84%E4%BD%9C%E7%94%A8%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [synchronized 底层实现原理？](#synchronized-%E5%BA%95%E5%B1%82%E5%AE%9E%E7%8E%B0%E5%8E%9F%E7%90%86)
-- [volatile和synchronized的区别是什么？](#volatile%E5%92%8Csynchronized%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88)
-- [ReentrantLock和synchronized区别](#reentrantlock%E5%92%8Csynchronized%E5%8C%BA%E5%88%AB)
-- [wait()和sleep()的异同点？](#wait%E5%92%8Csleep%E7%9A%84%E5%BC%82%E5%90%8C%E7%82%B9)
-- [Runnable和Callable有什么区别？](#runnable%E5%92%8Ccallable%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB)
-- [线程执行顺序怎么控制？](#%E7%BA%BF%E7%A8%8B%E6%89%A7%E8%A1%8C%E9%A1%BA%E5%BA%8F%E6%80%8E%E4%B9%88%E6%8E%A7%E5%88%B6)
-- [守护线程是什么？](#%E5%AE%88%E6%8A%A4%E7%BA%BF%E7%A8%8B%E6%98%AF%E4%BB%80%E4%B9%88)
-- [线程间通信方式](#%E7%BA%BF%E7%A8%8B%E9%97%B4%E9%80%9A%E4%BF%A1%E6%96%B9%E5%BC%8F)
-- [ThreadLocal](#threadlocal)
-  - [ThreadLocal原理](#threadlocal%E5%8E%9F%E7%90%86)
-  - [ThreadLocal内存泄漏的原因？](#threadlocal%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F%E7%9A%84%E5%8E%9F%E5%9B%A0)
-  - [ThreadLocal使用场景有哪些？](#threadlocal%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [AQS原理](#aqs%E5%8E%9F%E7%90%86)
-- [ReentrantLock 是如何实现可重入性的?](#reentrantlock-%E6%98%AF%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E5%8F%AF%E9%87%8D%E5%85%A5%E6%80%A7%E7%9A%84)
-- [锁的分类](#%E9%94%81%E7%9A%84%E5%88%86%E7%B1%BB)
-  - [公平锁与非公平锁](#%E5%85%AC%E5%B9%B3%E9%94%81%E4%B8%8E%E9%9D%9E%E5%85%AC%E5%B9%B3%E9%94%81)
-  - [共享式与独占式锁](#%E5%85%B1%E4%BA%AB%E5%BC%8F%E4%B8%8E%E7%8B%AC%E5%8D%A0%E5%BC%8F%E9%94%81)
-  - [悲观锁与乐观锁](#%E6%82%B2%E8%A7%82%E9%94%81%E4%B8%8E%E4%B9%90%E8%A7%82%E9%94%81)
-- [乐观锁有什么问题?](#%E4%B9%90%E8%A7%82%E9%94%81%E6%9C%89%E4%BB%80%E4%B9%88%E9%97%AE%E9%A2%98)
-- [什么是CAS？](#%E4%BB%80%E4%B9%88%E6%98%AFcas)
-- [CAS存在的问题？](#cas%E5%AD%98%E5%9C%A8%E7%9A%84%E9%97%AE%E9%A2%98)
-- [并发工具](#%E5%B9%B6%E5%8F%91%E5%B7%A5%E5%85%B7)
-  - [CountDownLatch](#countdownlatch)
-  - [CyclicBarrier](#cyclicbarrier)
-  - [CyclicBarrier和CountDownLatch区别](#cyclicbarrier%E5%92%8Ccountdownlatch%E5%8C%BA%E5%88%AB)
-  - [Semaphore](#semaphore)
-- [原子类](#%E5%8E%9F%E5%AD%90%E7%B1%BB)
-  - [基本类型原子类](#%E5%9F%BA%E6%9C%AC%E7%B1%BB%E5%9E%8B%E5%8E%9F%E5%AD%90%E7%B1%BB)
-  - [数组类型原子类](#%E6%95%B0%E7%BB%84%E7%B1%BB%E5%9E%8B%E5%8E%9F%E5%AD%90%E7%B1%BB)
-  - [引用类型原子类](#%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B%E5%8E%9F%E5%AD%90%E7%B1%BB)
-
-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
 ## 线程池
 
 线程池：一个管理线程的池子。

Java/Java集合面试题.md

@@ -1,53 +1,3 @@
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-- [常见的集合有哪些？](#%E5%B8%B8%E8%A7%81%E7%9A%84%E9%9B%86%E5%90%88%E6%9C%89%E5%93%AA%E4%BA%9B)
-- [List 、Set和Map 的区别](#list-set%E5%92%8Cmap-%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [ArrayList 了解吗？](#arraylist-%E4%BA%86%E8%A7%A3%E5%90%97)
-- [ArrayList 的扩容机制？](#arraylist-%E7%9A%84%E6%89%A9%E5%AE%B9%E6%9C%BA%E5%88%B6)
-- [怎么在遍历 ArrayList 时移除一个元素？](#%E6%80%8E%E4%B9%88%E5%9C%A8%E9%81%8D%E5%8E%86-arraylist-%E6%97%B6%E7%A7%BB%E9%99%A4%E4%B8%80%E4%B8%AA%E5%85%83%E7%B4%A0)
-- [Arraylist 和 Vector 的区别](#arraylist-%E5%92%8C-vector-%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [Arraylist 与 LinkedList 区别](#arraylist-%E4%B8%8E-linkedlist-%E5%8C%BA%E5%88%AB)
-- [HashMap](#hashmap)
-  - [解决hash冲突的办法有哪些？HashMap用的哪种？](#%E8%A7%A3%E5%86%B3hash%E5%86%B2%E7%AA%81%E7%9A%84%E5%8A%9E%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9Bhashmap%E7%94%A8%E7%9A%84%E5%93%AA%E7%A7%8D)
-  - [使用的hash算法？](#%E4%BD%BF%E7%94%A8%E7%9A%84hash%E7%AE%97%E6%B3%95)
-  - [扩容过程？](#%E6%89%A9%E5%AE%B9%E8%BF%87%E7%A8%8B)
-  - [put方法流程？](#put%E6%96%B9%E6%B3%95%E6%B5%81%E7%A8%8B)
-  - [红黑树的特点？](#%E7%BA%A2%E9%BB%91%E6%A0%91%E7%9A%84%E7%89%B9%E7%82%B9)
-  - [为什么使用红黑树而不使用AVL树？](#%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BD%BF%E7%94%A8%E7%BA%A2%E9%BB%91%E6%A0%91%E8%80%8C%E4%B8%8D%E4%BD%BF%E7%94%A8avl%E6%A0%91)
-  - [在解决 hash 冲突的时候，为什么选择先用链表，再转红黑树?](#%E5%9C%A8%E8%A7%A3%E5%86%B3-hash-%E5%86%B2%E7%AA%81%E7%9A%84%E6%97%B6%E5%80%99%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89%E6%8B%A9%E5%85%88%E7%94%A8%E9%93%BE%E8%A1%A8%E5%86%8D%E8%BD%AC%E7%BA%A2%E9%BB%91%E6%A0%91)
-  - [HashMap 的长度为什么是 2 的幂次方？](#hashmap-%E7%9A%84%E9%95%BF%E5%BA%A6%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF-2-%E7%9A%84%E5%B9%82%E6%AC%A1%E6%96%B9)
-  - [HashMap默认加载因子是多少？为什么是 0.75？](#hashmap%E9%BB%98%E8%AE%A4%E5%8A%A0%E8%BD%BD%E5%9B%A0%E5%AD%90%E6%98%AF%E5%A4%9A%E5%B0%91%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF-075)
-  - [一般用什么作为HashMap的key?](#%E4%B8%80%E8%88%AC%E7%94%A8%E4%BB%80%E4%B9%88%E4%BD%9C%E4%B8%BAhashmap%E7%9A%84key)
-  - [HashMap为什么线程不安全？](#hashmap%E4%B8%BA%E4%BB%80%E4%B9%88%E7%BA%BF%E7%A8%8B%E4%B8%8D%E5%AE%89%E5%85%A8)
-  - [HashMap和HashTable的区别？](#hashmap%E5%92%8Chashtable%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [LinkedHashMap底层原理？](#linkedhashmap%E5%BA%95%E5%B1%82%E5%8E%9F%E7%90%86)
-- [讲一下TreeMap？](#%E8%AE%B2%E4%B8%80%E4%B8%8Btreemap)
-- [HashSet底层原理？](#hashset%E5%BA%95%E5%B1%82%E5%8E%9F%E7%90%86)
-- [HashSet、LinkedHashSet 和 TreeSet 的区别？](#hashsetlinkedhashset-%E5%92%8C-treeset-%E7%9A%84%E5%8C%BA%E5%88%AB)
-- [什么是fail fast？](#%E4%BB%80%E4%B9%88%E6%98%AFfail-fast)
-- [什么是fail safe？](#%E4%BB%80%E4%B9%88%E6%98%AFfail-safe)
-- [讲一下ArrayDeque？](#%E8%AE%B2%E4%B8%80%E4%B8%8Barraydeque)
-- [哪些集合类是线程安全的？哪些不安全？](#%E5%93%AA%E4%BA%9B%E9%9B%86%E5%90%88%E7%B1%BB%E6%98%AF%E7%BA%BF%E7%A8%8B%E5%AE%89%E5%85%A8%E7%9A%84%E5%93%AA%E4%BA%9B%E4%B8%8D%E5%AE%89%E5%85%A8)
-- [迭代器 Iterator 是什么？](#%E8%BF%AD%E4%BB%A3%E5%99%A8-iterator-%E6%98%AF%E4%BB%80%E4%B9%88)
-- [Iterator 和 ListIterator 有什么区别？](#iterator-%E5%92%8C-listiterator-%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB)
-- [并发容器](#%E5%B9%B6%E5%8F%91%E5%AE%B9%E5%99%A8)
-  - [ConcurrentHashMap](#concurrenthashmap)
-    - [put执行流程？](#put%E6%89%A7%E8%A1%8C%E6%B5%81%E7%A8%8B)
-    - [怎么扩容？](#%E6%80%8E%E4%B9%88%E6%89%A9%E5%AE%B9)
-    - [ConcurrentHashMap 和 Hashtable 的区别？](#concurrenthashmap-%E5%92%8C-hashtable-%E7%9A%84%E5%8C%BA%E5%88%AB)
-  - [CopyOnWrite](#copyonwrite)
-  - [ConcurrentLinkedQueue](#concurrentlinkedqueue)
-  - [阻塞队列](#%E9%98%BB%E5%A1%9E%E9%98%9F%E5%88%97)
-    - [JDK提供的阻塞队列](#jdk%E6%8F%90%E4%BE%9B%E7%9A%84%E9%98%BB%E5%A1%9E%E9%98%9F%E5%88%97)
-    - [原理](#%E5%8E%9F%E7%90%86)
-- [参考链接](#%E5%8F%82%E8%80%83%E9%93%BE%E6%8E%A5)
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-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
-
-
 ## 常见的集合有哪些？
 
 Java集合类主要由两个接口**Collection**和**Map**派生出来的，Collection有三个子接口：List、Set、Queue。