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前言时代的一粒尘，落在每个人身上，就是一座山”。时代更迭变换，我们好像都知道今天与昨天不同，又好像肉眼看不出哪里不同。但其实它就正在以各种各样的方式体现在每一个普通人身上。疫情爆发三个月的时间，截止2020年4月份全国2296家影视公司破产，1万2千多家教育机构消失，1万1千多家旅游公司倒闭&am...

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TreeMap深入浅出源码分析Java8

二叉查找树红黑树的起源得从二叉查找树（二叉排序树）说起。先来看二叉查找树的定义：1、要么为一颗空树，要么就是一颗具有如下特性的二叉树。2、左子节点的值必须小于等于父节点的值。3、右子节点的值必须大于等于父节点的值。每个节点都符合这个特性，所以易于查找，如下图：平衡二叉树定义：1、要么为...

【底层原理之旅—HashMap深入浅出的源码分析（JDK1.7版本）】｜Java 开发实战

概念回顾HashMap由数组+链表组成的，数组是HashMap的主体，链表则是主要为了解决哈希冲突而存在的，如果定位到的数组位置不含链表（当前entry的next指向null），那么对于查找，添加等操作很快，仅需一次寻址即可；如果定位到的数组包含链表，...

【底层原理之旅—ThreadLocal深入浅出的源码分析｜Java 刷题打卡

题目ThreadLocal深入浅出的源码分析知识点基本介绍ThreadLocal是对Thread内部的局部变量ThreadLocalMap的维护类。当线程持有多个ThreadLocal的操作时，会在ThreadLocalMap中通过key进行寻找。每个Thread里面维护了一个ThreadLocal...

【底层原理之旅—HashMap深入浅出的源码分析（JDK1.8版本）】｜Java 刷题打卡

题目HashMap深入浅出的源码分析知识点HashMap是一个基于map接口实现的散列表，存储内容是键值对 (key-value) 映射，并且键和值都可以使用null，因为key不允许重复，因此只能有一个键为null。HashMap使用 hash 算法进行数据的存储和查询。HashMap的实现用的是...

JuiceFS分布式文件系统源码分析（Java层）

01 引言在前面的博客《JuiceFS-开源分布式文件系统入门（一篇就够了）》，我们大致了解了JuiceFS的一些基本概念，它的架构图大致如下：本文主要针对Hadoop的Java API来分析下它的源码。02 JuiceFS Hadoop Java API 官方使用教程：《在 Hadoop 生态使...

JVM 源码分析之一个 Java 进程究竟能创建多少线程

概述虽然这篇文章的标题打着JVM源码分析的旗号，不过本文不仅仅从 JVM 源码角度来分析，更多的来自于 Linux Kernel 的源码分析，今天要说的是 JVM 里比较常见的一个问题。这个问题可能有几种表述一个Java进程到底能创建多少线程？到底有哪些因素决定了能创建多少线程？java.lang....

源码分析 There is no getter for property named '*' in 'class java.lang.String(2)

直到你进入到DynamicContext.java类时 public DynamicContext(Configuration configuration, Object parameterObject) { if (parameterObject != null && !(para...

源码分析 There is no getter for property named '*' in 'class java.lang.String(1)

There is no getter for property named '*' in 'class java.lang.String'，此错误之所以出现，是因为mybatis在对parameterType="String"的sql语句做了限制，假如你使用<when test=...

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