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XML and JSON 1， XML(eXtensible Markup Language) characteristic: xml is a platform independent markup language xml is self descriptive effect: Network data transmissiondata storage configuration file xml file: xml file is a way to save xml data xml syntax (see a case) <?xml version="1.0" encoding="UTF-8"?> <!--First l ...

introduce My LeetCode homepage, one problem one solution Tags: queue, dynamic programming, binary search 363. The rectangular area does not exceed the maximum value of K and Difficulty difficulty 363. The rectangular area does not exceed the maximum value of K and: https://leetcode-cn.com/problems/max-sum-of-rectangle-no-larger-than-k ...

1. Concept The so-called dependency injection (DI) actually means that when a bean instance references another bean instance, the spring container helps us create a dependent bean instance and inject (pass) it into another bean. Dependency: the creation of a Bean object depends on the container, and the Bean object depends on resourcesInj ...

Video link: https://www.bilibili.com/video/BV1VP4y1c7j7?p=48&spm_id_from=pageDriver preparation (1) New maven project See the following steps for details: https://editor.csdn.net/md/?articleId=123185097 (2) Create two forms in sql: t_emp,t_dept t_dept form: t_emp form: Add a did to connect with the primary key of the ...

background I still prefer the streaming data processing of java8 stream. Its map, filter and other operations make me look at Java again. It's like a flash in front of you when you accidentally meet your beautiful ex girlfriend after breaking up for many years (I'm talking nonsense, don't take it seriously!!!) However, after a period of time ...

Official interpretation: LockSupport is the basic thread blocking primitive used to create locks and other synchronization classes; LockSupport class uses a concept called permission to block and wake up threads. Each thread has a permission; permit has only two values: 1 and zero. The default value is zero; You can think of a license as a ...

Detailed explanation of multithreading summary Core concept Threads are independent execution pathsWhen the program is running, there will be multiple threads in the background, such as main thread and gc thread, even if there is no thread created by itselfmain() is called the main thread, which is the entry of the system and is used to exec ...

The previous article mentioned that the cache will be used when querying. Its built-in two-level cache is as follows:// The L1 cache is bound to sqlsession in the executor // org.apache.ibatis.executor.BaseExecutor#localCache // Point to org apache. ibatis. cache. impl. PerpetualCache#cache private Map<Object, Object> cache = new HashMap& ...

generic paradigm A generic type is actually a type parameter used to specify a type. In order to count students' scores, it is required to design a Score object, including course name, course number and course Score. However, there are two kinds of scores: one is to take excellent, good and qualified as the result, and the other is to use dig ...

Library management system is a common small project in learning programming. After learning classes and objects, encapsulation, inheritance, polymorphism and interfaces, we can use these ideas to realize our library management system. Here I will use two blogs to explain the specific implementation methods. According to the first two blogs, we ...