Programmer Think

Be a positive personCode, fix bug s, improve yourselfI have a paradise for programming, spring blossoms! Learning should be happy. In this paradise, I try my best to explain knowledge or technology with simple and easy-to-understand (funny and interesting) expressions, and make the learning journey full of fun. This is the beginning of blog wri ...

affair Transaction actually refers to a set of operations that contain many single logic. As long as one logic fails to execute successfully, it fails. All data is returned to its original state (rollback) Why do we have business? To ensure the success of logic. Example: Bank transfer. Demonstrate transactions using the command line. Op ...

Last article mentioned that "i++;" itself is a thread unsafe operation, because the operation is not atomic, there are two processes of value and assignment, but how can it be unsafe? This issue uses a "vmlens" project to demonstrate why thread insecurity occurs. At the end of the paper is a brief introduction to vmlens. Tes ...

This paper mainly introduces the traffic gray level of Knative Serving, and demonstrates how to create different Revisions and how to scale the traffic gray level among different Revisions through a rest-api example. Deploy rest-api v1 Code Before testing, we need to write a rest-api code and be able to distinguish between different version ...

I. Time difference of Java Date type Look at the code below. public static void main(String[] args) throws Exception { Date date1 = new Date(); System.out.println("date1: " + date1.toString()); Date date2 = new Date(date1.toString()); System.out.println("date2: " + date2.toString()); } The results are as follows. date1: ...

Preface It has not been updated for a long time. On the one hand, I am busy with my work, on the other hand, I am in the process of learning. Next, it should gradually return to a stable state of renewal, sharing some interesting points of knowledge and my personal thinking. Interested friends can pay attention to it! If there is something wron ...

This article was first published in the public number "andyqian" of personal WeChat, and we look forward to your attention! Preface Previous article " Java Thread Pool Executor><Analysis of ThreadPoolExecutor Principle ThreadPoolExecutor describes the concepts and principles of ThreadPoolExecutor, and today we'll lo ...

I. Callers of services Overview of service invokers: The invoker package in the remoting package is the service caller, including configuration, bean proxy, load balancing strategy, invocation scheme, etc. II. Generating Agent 2.1 @XxlRpcReference Let's first look at the @XxlRpcReference annotation ...

Create and use dictionaries Dictionaries can be created in the following ways: phoneBook = {"Bill":"1234", "Mike":"4321"} In a dictionary, keys are unique. If the key is not unique, then the program will not throw an exception, but the same key value will be overwritten by the last one: phoneBook = {"Bill":"1234", "Mike":"4321", "Bill":"5678"} ...

background According to my blogging practice, first explain the background. In the company's system, our configuration files are divided into several parts. Different configuration files have different configuration contents. For the output of logs, different environments need to make different outputs. This is a premise. This article will talk ...