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This article has been included https://github.com/lkxiaolou/lkxiaolou Welcome, star. preface In the previous article Design and implementation of Cobar SQL audit A question about the performance of timestamp acquisition is raised in Get the operating system time, and directly call system in Java currentTimeMillis(); It's OK, but in Cob ...

Concept: ensure that there is only one instance of a class and provide a global access point to access this unique instance ps: Singleton mode is an object creation mode. Singleton mode has three main points: first, a class can only have one singleton, second, it must create this instance by itself, and third, it must provide this instance ...

I background When accessing dynamic pages, users need to send a request to query the database through ajax to obtain dynamic data for display, but if the page has a large amount of visits and the data in the database changes frequently The rate is not high, which will cause great access pressure to the database. How to decompress the da ...

Interrupt threadThread of thread Interrupt () method is to interrupt a thread. It will set the interrupt status bit of the thread, that is, set it to true. Whether the thread dies as a result of the interrupt, waits for a new task, or continues to run to the next step depends on the program itself. The thread will detect this interrupt flag bit ...

Basic exception handling syntax and procedures The error handling mechanism in Java refers to non compiled errors, that is, non syntax errors. Similar to the division by zero error, that is, you can't divide by 0 during division. Java will encounter the following errors: example: system out. println(16 / 0); The ArithmeticException here is ...

Strategy mode 1. Basic introduction The strategy pattern defines the algorithm family and encapsulates them separately so that they can replace each other. This pattern makes the change of the algorithm independent of the customers using the algorithm.This model embodies several design principles: Opening and closing principle: separat ...

Originally written by binder When it comes to binder, many people should say how old the technology of binder is, and there are a lot of articles analyzing binder. You don't need to write articles about binder at all! In fact, I don't agree with this view. Tell me my reasons: You need to summarize the binder knowledge you have read and learne ...

Class modifier Class modifiereffectfinalCannot be inherited from final classopenopen class that can be inheritedabstractabstract classenumEnumeration classdataData classsealedSealing classannotationAnnotation abstract class Use the abstract keyword to mark a class as abstract abstract class Abstract class name[(primary constructor )][:I ...

  Tags: [advanced] [Redis] [ZooKeeper] 1. Ask What is the difference between redis distributed locks and zk distributed locks? 2. Analysis This question has high requirements for the interviewer. It should not only understand the implementation method, but also master the principle. So the answer to the question is divided into many levels ...

1, IoC control reversal IoC control inversion, fully known as Inverse of Control, is a design conceptThe agent creates and manages the object, and the consumer obtains the object through the agentThe purpose of IoC is to reduce the direct coupling between programsAdd IoC container to manage objects in a unified way and make object association ...