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Reading needs a certain foundation, which is not suitable for people who first know Java. There are some concise languages, some knowledge points or a brush, and you don't know that you need to consult the materials in detail. The purpose of this article is to supplement some details of Java foundation, some slightly in-depth places and some pl ...

1, Introduction to RocketMQ architecture 1.1 logical deployment diagram (pictures from the Internet) 1.2 description of core components As can be seen from the above figure, RocketMQ's core components mainly include four, namely NameServer, Broker, Producer and Consumer. Let's briefly explain these four core components in turn: NameServe ...

Chapter 1 Introduction to Scala 1.1 general Scala is a static type programming language that takes Java virtual machine (JVM) as the running environment and combines the best features of object-oriented and functional programming (static languages need to be compiled in advance, such as Java, c, c + +, dynamic languages such as js). 1) Scala ...

AbstractQueuedSynchronizer (AQS) source code detailed analysis - CountDownLatch source code analysis 1. CountDownLatch introduction CountDownLatch is a simple synchronizer. It means that one or more threads are allowed to wait for the operation of other threads to complete before performing subsequent operations. Common usage of CountDownLat ...

catalogue abnormal 1. Classification of anomalies 2. Two methods of handling exceptions try...catch...finally The difference between compile time exception and run-time exception: Methods in Throwable finally throws throw  The difference between throws and throw: abnormal Abnormal condition in Java program 1. Classification of ano ...

catalogue What is the method Method definition and call Method overloading Command line parameters Variable parameter recursion What is the method? Method is an ordered combination of steps to solve a class of problems Methods are contained in classes or objects Methods are created in the program and referenced elsewhere Use a piece ...

method A Java method is a collection of statements that together perform a function; Method is an orderly combination of steps to solve a class of problems, which is contained in classes and objects; Methods are created in the program and referenced elsewhere Method definition and call definition Java method is similar to functions in oth ...

brief introduction In this article, Android is used to obtain the Activity on the top of the mobile phone to monitor the usage of mobile applications Technical background In my daily study, I want to automatically collect the use time of various applications of mobile phone software, such as get, geek time, Keep, wechat reading, etc However ...

Binary tree is a common data structure in our daily learning. During the interview and study, we will inevitably encounter some algorithm problems related to binary tree. Today, I brought you some classic binary tree basic algorithm problems. Let's have a look! catalogue 1. Check whether the two trees are the same ① Title Description ② tr ...

What is a Lamdba expression According to Baidu: lambda expression is an anonymous function. lambda expression is based on λ The name of calculus directly corresponds to the lambda abstraction. It is an anonymous function, that is, a function without a function name. Lambda expressions can represent closures (note the difference from ...