Programmer Think

Array and linked list are two kinds of data structures commonly used in the program, and they are also one of the interview questions often tested in the interview. However, for many people, they just vaguely remember the difference between them. Maybe they still don't remember it right. And every time they come for an interview, they have to r ...

1, Basic source code analysis 1. Find the entrance Spring's AOP is started by accessing the BeanPostProcessor postprocessor 2.BeanPostProcessor BeanPostProcessor is embodied in the doCreateBean of IOC source code analysis, the latter sentence of populateBean Object exposedObject = bean; try { po ...

1 Functional Interface Functional interfaces in Java refer to interfaces that have one and only one abstract method Functional interfaces, that is, interfaces for functional programming scenarios; while functional programming in Java is represented by Lambda, so functional interfaces are interfaces th ...

1 General 1.1 INTRODUCTION A simple small salary management system, JavaFX + front-end Spring Boot, has few functions. It focuses on the UI and some logic of the front-end. The back-end is very simple. Main functions: User registration / login Verification code retrieve password Users modify information, modify Avatar Display salary in bar cha ...

Invalid pom file after idea clones project from git When your idea pulls projects from git, projects that are cloned for the first time often report that pom files are not in maven format: as shown in the following figure This is because Maven has not been set after getting down from git. Open File ...

1 General Visitor pattern is a behavior pattern, which is not commonly used. It can separate the algorithmic logic acting on the object from the object itself. 2 visitor mode When we need to operate on a group of similar types of objects, we can maintain the operation logic within each object separately, but this violates the principle of singl ...

concept IOC(Inversion of Control): the so-called inversion of control is that the application itself is not responsible for the creation and maintenance of dependent objects, and the creation and maintenance of dependent objects are in the charge of external containers. In this way, the application of ...

1. Download related software JDK: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html Tomcat: http://mirrors.shuosc.org/apache/tomcat/tomcat-9/v9.0.2/bin/apache-tomcat-9.0.2.tar.gz 2. Install and configure JDK [root@JDK-Tomcat ~]# rpm -ivh jdk-8u151-linux-x64.rpm Add the followi ...

The following adjustments are made in the test environment, then the documentation is written. System tuning: 1. Kernel Parameter Adjustment additional net.ipv4.ip_local_port_range = 1024 65535 net.core.somaxconn = 2048 net.core.rmem_default = 262144 net.core.wmem_default = 262144 net.core.rmem_max = 16777216 ...

Preface In the actual development process, we often encounter businesses that require multi-threaded concurrency. Finally, we need to summarize the tasks completed by each thread, but the main thread usually ends earlier than the sub-threads. If you want to wait for each sub-thread to finish before running the main thread, you need to identify ...