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Source Version 4.8.0 demo code for the official Consumer consumption message DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_4"); // 1. Set NamesrvAddr address consumer.setNamesrvAddr("127.0.0.1:9876"); // 2. Set Consumer Location Optional Value Reference Enumeration Co ...

Learning content: packaging class (the examples are int type, and other types are painted according to gourd) Two new features have been added in Java 5, that is, automatic boxing and unpacking. Because basic types are widely used, but Java is an object-oriented language, it provides support for packaging types. There are eight wrapper cl ...

Start with what you can see and explore Activity 1.Activity Activity is a component that can contain an application user interface, mainly for interacting with users. An application can contain zero or more activities. Although an application can have no activities, it is best to have them, since they are meant to interact with the user and t ...

1. Performance optimization case 1: adjusting heap size to improve service throughput 1.1. Modify tomcat JVM configuration In the production environment, Tomcat does not recommend configuring variables directly in catalina.sh, but in setenv.sh under the same level directory (bin directory) as Catalina. 1.2 initial configuration Writ ...

Source: blog.csdn.net/wang258533488/article/details/78901303 1 Overview In project development, there are often the needs of marketing activities such as lucky draw, such as integral turntable, scratch music, slot machine and so on. In fact, the implementation method of the background is the same. This paper introduces a common implementation ...

This article is compiled and published by jiumo (Ma Zhi), chief lecturer of HeapDump performance community Chapter 17 - x86-64 register The system of machine language that can be interpreted by different CPUs is called ISA (Instruction Set Architecture), or instruction set. Intel calls the 32-bit CPU Instruction Set Architecture among x86 seri ...

Strategy mode brief introduction The policy pattern is the packaging of the algorithm. It separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects for management. Policy patterns usually package a series of algorithms into a series of policy classes as subclasses of an abstract policy ...

Author: Xiao Fu GeBlog: https://bugstack.cnPrecipitate, share and grow, so that you and others can gain something! 😄Recently, I am interested in expanding various functions in combination with the development capability of IDEA Plugin. Based on this, different cases are used to explore the IDEA Plugin plug-in development technology. I hope thi ...

Resource download: https://download.csdn.net/download/weixin_44893902/45601768 Exercise point design: fuzzy query, delete, add 1, Language and environment Implementation language: JAVA language.Environment requirements: MyEclipse/Eclipse + Tomcat + MySql.Use technology: Jsp+Servlet+JavaBean or spring MVC + Spring + mybatis. 2, Realiz ...

background Yes, I'm still working on the XXXX project and interfacing with a third party. The difference is that this time I deal with my own business logic. During the development process, I encountered such a problem: Table structure: A main table a and an associated table B store the status recorded in table B. Scenario: Step 1: create main ...