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catalogue 1. Download source code 2. Decompress and prepare for compilation 3. Import IDE compilation source code 4. Configure the startup class and start the operation 1. Download source code Download the source code from Tomcat's official website and find the path: home page of the official website → under [Download] on the left n ...

Spring source code collection: Spring source code analysis (I) IOC container_ BeanDefinition and container loading preface Before we start to analyze the Spring source code, we need to do a few preparations. What we want to analyze in this chapter is to use ClassPathXmlApplicationContext to read the xml configuration file and start ...

Preface This article is the author's record of learning Serializable and arcelable to explore his own questions I. Problems Caused by the Author Why does Java implement Serializable objects to realize that they support serialization? Why is Serializable less efficient than Parcelable? 2. Interpretation of Source Code Serializable cor ...

Last article Through the re examination of an online accident, it leads to the Arthas of Fubao factory, a Java diagnostic tool based on Java Dynamic bytecode technology; There is no need to elaborate on the use of Arthas. You can get started quickly by viewing the official documents, and there are many ways to play; In the previous article, onl ...

introduction With the growth of business volume, the cache schemes used generally go through the following steps: 1) query DB directly without cache; 2) Data synchronization + Redis; 3) Multi level cache has three stages. In the first stage, direct DB query can only be used in small traffic scenarios. With the increase of QPS, cache needs to ...

1, Fundamentals of sorting algorithm 1. Algorithm classification Common sorting algorithms can be divided into two categories: Comparison sort: the relative order between elements is determined by comparison. Because its time complexity cannot exceed O(nlogn), it is also called nonlinear time comparison sort. Non comparison sort: the re ...

1, Review the contents of L2 cache The L2 cache is built on the L1 cache. When receiving the query request, MyBatis will query the L2 cache first. If the L2 cache is not alive In, query the level-1 cache again. If there is no level-1 cache, query the database again. L2 cache - > L1 cache - > database. Unlike the L1 Cache, the L2 Cach ...

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demand Find the number of days between the current day and the specified date. The specified date must be before the current day, that is, the current day is 01-23, and the specified date should be 01-22 Solution Use the method provided in the hutools toolkit to calculate the number of days between two dates betweenDay() Three parameters: be ...

2020-02-02 The following is the source code analysis of HashMap in JDK 11. The analysis of the code will be mainly reflected in the form of comments. 1 Overview 1.1 main concepts of HashMap HashMap is a hash table implemented based on the Map interface, which realizes all operations in the Map interface. Moreover, HashMap allows the key to ...