Programmer Think

1, toString method in Object class: java.lang.Object class is the root class in the Java language, that is, the parent class of all classes. All method subclasses described in it can be used. When an Object is instantiated, the final parent class is Object. To create a Person class: public class Person { private String name; private ...

Deep understanding of JVM (VII) -- class loading and bytecode Technology (I) ](https://nyimapicture.oss-cn-beijing.aliyuncs.com/img/20200608151300.png) 1. Class file structure Get first class bytecode file method: Write java code in the text document (the file name is consistent with the class name), and change the file type to javaIn ...

1. Introduction to JDBC 1. What is JDBC? 2.JDBC writing steps 2. How to Get Database Connections Preparations: 1. Create a new lib folder under the project 2. Import the jar package into the lib directory 3. Add the imported jar package to the project through Add as library 4. Create related packages and test classes 5. Create ...

7. Project construction and deployment SpringBoot can be embedded with Servlet container, so it is very convenient to deploy. It can be directly packaged into executable Jar package and deployed on the server of Java allowed environment, or packaged into War package and deployed on external Tomcat server. 7.1 Jar deployment Spring boot ...

catalogue Problem description Solution 1 Solution 2 effect Supplementary notes Reference link Problem description On the Windows system, the Swing project developed by myself needs to use JNA to call the dll file of the dynamic link library( Java simple system monitoring )After using Maven assembly plugin (jar with dependencies) to for ...

preface Sorted out the common functions of logback, and recorded some questions in the process of use and the troubleshooting process of problems, so as to prevent yourself from making similar mistakes again. I hope it will be helpful to you passing by. 1, How to use logback The use of any framework is a three-step process: 1. Impo ...

prepare First, prepare the simplest demo and a rest interface. Our goal is to deploy this demo to the k8s cluster and access it. The port exposed here is 8080 Run the jar package locally Local access Image packaging First upload the jar package to a folder on the master Write Dockerfile #create a file vim Dockerfile ##conte ...

Spring preschool Foundation rely on 1. Three elements of dependency composition 1.1 group id 1.2 project name 1.3 version number 2. Relationship between coordinates and local warehouse Go to the local warehouse according to the coordinates. Find jar file Here are all paths, pointing to the required files 3. If the dependency ...

Automatic assembly is a way for Spring to meet bean dependencies. Before that, you must manually inject dependencies into beans, otherwise the attribute will be emptyAutomatic assembly: Spring will automatically find the context and automatically assemble properties for the bean There are three ways to assemble in Spring Display configuratio ...

1. Birth background Because the standard Java library cannot provide enough methods to manipulate its core classes. Apache Commons Lang provides these additional methods and tools. Lang is Java Lang API provides many helper utilities, especially string operation methods, basic numerical methods, object reflection, concurrency, creation and se ...