Programmer Think

A test engineer walks into a bar and asks for a beer; A test engineer walks into a bar and asks for a cup of coffee; A test engineer walked into a bar and ordered 0.7 glasses of beer; A test engineer walks into a bar and asks for -1 beer; A test engineer walked into a bar and ordered 2 ^ 32 glasses of beer; A test engineer walked into ...

##Foreword During the interview, it is also common for the interviewer to investigate "ThreadLocal", so it is very necessary to understand it thoroughly Some interviewers ask straight to the point: "Do you know ThreadLocal?" "Tell me about your understanding of ThreadLocal" Of course, some interviewers will slowl ...

Recommended reading: Ali's two cool Classics: design mode + cache + Spring + virtual machine + MySQL + middleware + concurrency and other problems are all solvedHow to learn HTTP that big companies must ask? I suggest you read this article!Ant, byte and PDD social recruitment face by Java post (distributed + thread safety + MySQL+CAS) ArrayLi ...

1, Five basic data structures 1. Introduction to redis “Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker.” —— Redis is an open source (BSD licensed) in memory data structure storage, which is used as database, cache and message agent. (from the off ...

Calculation of individual income tax for year-end bonus def nzjgs(n): """ :type n: float Total year-end bonus :rtype: float Year end bonus tax payment """ tmp = n/12 if tmp <= 3000: return n * 0.03 if 3000 < tmp <= 12000: return n * 0.1 - 210 if 12000 < tmp <= 25000: return ...

MySQL 8.0 has been released for a long time, but everyone may stay at 5.7.0 x. Even older. In fact, MySQL 8.0 has added many heavy new features, such as "hidden index" or "invisible index" introduced by the stack leader today. What the hell is a hidden index? Hide index literally means to hide the index, that is, invisible ...

Why do Java objects need to be serialized Serialization can convert objects into binary streams, and objects can be easily transmitted and saved in the network. How to implement serialization Implement Serializable interfaceImplement Externalizable interface **The difference between the two interfaces is: * * the Serializable interface wi ...

If you were given a huge file containing 100 million lines of data, and you could convert the data into the production database within one week, how would you operate? The above problem is that little black brother received a real business demand some time ago and migrated the historical data of an old system to the new production system throu ...

Entity objects transfer values to each other. For example, assigning the value of VO object to entity object is a common function in the code. It is troublesome to assign values to each other through get and set. The operation can be easily completed with the help of tool class BeanUtils. BeanUtils dependent package import BeanUtils is a memb ...

Recommended reading: This set of 40K+star learning notes on Github can help you handle more than 95% of Java interviews It's no exaggeration to say that this SpringBoot study guide can solve 98% of the problems you encounter The most comprehensive test questions are fresh: 70 + algorithm questions, nearly 30 kinds of knowledge points often ...