Programmer Group

Part I This paper introduces the use of event bus in guava package, and deeply understands the implementation details in the source code EventBus understand First of all, we need to look at the EventBus class. There are many comments on the class, which are summarized as follows: Eventbus ensures that subscribers will not be accessed at the sam ...

Here are several typical memory overflow cases in Java! Write in frontAs a programmer, more or less will encounter some memory overflow scenarios. If you haven't yet, it means that you may have a relatively short working life, or you are a fake programmer at all! Ha ha, make a joke. Today, we will list several typical memory overflow cases in t ...

1, Overview AbstractSet class is the skeleton implementation class in Set family. It constructs a layer of abstraction between interface and implementation class. Its purpose is to reuse some common functions and facilitate extension, and provide common method templates for subclasses. The AbstractSet class has much less content than the Abstr ...

concept Internal state, external state, enjoyment pool Role & UML Demo: Editor Picture Reuse - Java Reference concept Flyweight Pattern is a shared way to reuse a large number of fine-grained objects to reduce memory usage (to avoid creating and destroying objects in large amounts repeatedly). The Flyweight in the name is one ...

brief introduction In java programs, we use logs to locate and discover potential problems in our projects.In modern java projects, we use logging frameworks such as log4j or slf4j, Logback, and so on to handle logging issues. JVM is the basis of running java programs. Events in JVM such as GC, class loading, JPMS, heap, threads and so on can a ...

Mainly paste code Make a summary for yourself (connection server initialization and processing): 1. NioEventLoop is used to positively handle io connection 2.NioEventLoopGroup can be simply understood as two processing groups, one is accepting connection, the other is processing connection, and the chooser in it is NioEventLoop array Server ...

catalog 1. Preface 2. Log face 3. Log Library 4. Log adapter 5. Selection of log base 6.logback.xml configuration file 1. Preface When it comes to logging tools, you must have heard these terms in your daily work or study: log4j, logback, jdk-logging, slf4j, commons-logging, etc. What is the relationship between them and what is their role ...

My LeetCode: https://leetcode-cn.com/u/ituring/ My LeetCode source code [GitHub]: https://github.com/izhoujie/Algorithmcii Square root of LeetCode 69. x subject Implement the int sqrt(int x) function. Calculates and returns the square root of X, where x is a non negative integer. Because the return type is an integer, the result only retains ...

brief introduction Jcmd is the debugging tool that comes with JDK and has very powerful functions.Jcmd was officially introduced in JDK7. With jcmd, you can completely replace many other commonly used tools, such as jstak and jmap. Jcmd can send specific diagnostic commands to the JVM.For security reasons, users using jcmd must have the same us ...

From: https://www.cnblogs.com/du-hong/p/11718894.html brief introduction According to the plan in the previous article, this one will share the test method with the kids. 1, Set parameters Test methods can have Parameters. Each test method can have any number of Parameters, and you can pass the correct Parameters to the method by using Te ...