Programmer Think

1. Succinct JDBC (Java DataBase Connectivity) is a Java API for executing SQL statements. It can provide unified access to a variety of relational databases. It is composed of a group of classes and interfaces written in Java language. JDBC provides a benchmark by which more advanced tools and interfaces can be built to enable database develop ...

Design mode self study notes 003_Real (decorator design mode, adapter design mode) 1, Decorator design mode In the previous proxy design pattern, we expanded the methods in the class. Now, a class in Wu needs to add new functions, that is, it needs to add new methods to realize new functions. The first way is to create another class to inheri ...

Environmental preparationDatabase version: MySQL 5.7.20-logCreate table SQLDROP TABLE IF EXISTS `t_ware_sale_statistics`; CREATE TABLE `t_ware_sale_statistics` (   `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'Primary key id',   `business_id` bigint(20) NOT NULL COMMENT 'Business organization code',   `ware_inside_code` bigint(20) NOT NULL C ...

When the browser accesses the server, it will encapsulate the parameter data, protocol version and request header information submitted by the user into a request message (i.e. request packet) and send it to the server. The Request message received by the server (such as Tomcat) will be encapsulated in the Request object. Programmers can ge ...

Define spring beans Bean definition in the corresponding code is the configuration meta information interface of beans defined in the Spring Framework, mainly including: Bean's class name, fully qualified name, concrete implementation classBean configuration meta information: scope, Auto Wiring, lifecycle callbackBean References: Collaborator ...

I Don't talk too much, let's see the effect first: Video station B effect demonstration address~ (no big guys, no big guys, no big guys) this is a single page music player. It only uses html+css and very basic vue syntax, so it is suitable for beginners. Take a look for 10 minutes~ This idea is based on the dark horse~ II Detailed productio ...

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🔎 This is JAVA Chengxian road. Pay attention to my learning JAVA and don't get lost 👍 If it helps you, give the blogger a free praise to show encouragement Welcome 🔎 give the thumbs-up 👍 Comment collection ⭐ ️ Array and two-dimensional array feel that it should be easier to understand by taking the equipment column of King glory as an exa ...

Basic introduction to NioEventLoop When building the Netty service, you first need to create a NioEventLoopGroup, that is, the following code: ··· NioEventLoopGroup boss = new NioEventLoopGroup(1); NioEventLoopGroup worker = new NioEventLoopGroup(); ··· Initialization timing: NioEventLoopGroup defines an EventExecutor[] children member vari ...

Classification of sets First, let's look at the overall classification of sets. Both Collection and Set Chinese can be translated into collections. However, from a Java programming perspective, Collections should be translated into containers and Sets into collections. Both Collection and Set Chinese can be translated into collections. However ...