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Interpretation of the core source code of ArrayList Feel easy to use little partner, please give me a praise Oh, thank you very much!!! Most of the content comes from the Internet, and individuals have added additional content to facilitate understanding and memory 1. Basic information of ArrayList The underlying array of ArrayList ...

ControllerAdvice analysis description @What controller advice sees most is the same as exception handling. Like this one below @ControllerAdvice public class TestControllerAdvised { @ExceptionHandler(value = Exception.class) public String modelAndViewException(){ // Do some exception handling logic } } When reading the source code of s ...

Sequential structure The basic structure of Java is sequential structure. Unless otherwise specified, it will be executed sentence by sentence in order Sequential structure is the simplest algorithm structure Between statements and between boxes, it is carried out from top to bottom. It is executed by several in turn Select stru ...

preface: In the process of successfully calling Gaode map api, I really encountered many problems. I feel that I have encountered all kinds of problems, such as importing jar package and For example, I found many conflicts between the two versions of grad.sok, but I did not try to resolve the conflicts between the two versions of grad.sok when ...

java serialization, read this article is enough 1, Meaning, meaning and usage scenario of serialization2, Serialization implementation1,Serializable1.1 ordinary serialization1.2 members are serialization of references1.3 mechanism of serializing the same object multiple times1.4 potential problems of Java serialization algorithm1.5 optional cu ...

Mybatis brief introduction MyBatis is an excellent persistence layer framework, which supports custom SQL, stored procedures and advanced mapping. MyBatis eliminates almost all JDBC code and the work of setting parameters and obtaining result sets. MyBatis can configure and map primitive types, interfaces and Java POJO s (Plain Old Java Objec ...

Prototype mode Prototype pattern solves the problem of copying a large number of attributes. This paper will introduce several depth attribute replication methods and several shallow attribute replication methods. The source code address of this paper will be given at the end of the text. Code before prototype pattern is not used public stat ...

1 - simple encryption system based on ASCII code [problem description] implement a simple encryption system based on ASCII code. The encryption rules are as follows: if (OriginalChar + Key > 126) then EncryptedChar = ((OriginalChar + Key)-127) + 32 else EncryptedChar = (OriginalChar + Key) The qualified key is a number ...

Simple interface implementation Basic knowledge understanding package In the previous study, we simply mastered the function relationship between classes and objects, and between classes. For the sorting of different code files, we put forward the concept of package, which can be understood as a folder to classify code files and facilitate fu ...

lock method analysis final void lock() { acquire(1); } The lock method calls the acquire method of AbstractQueuedSynchronizer /** * Acquires in exclusive mode, ignoring interrupts. Implemented * by invoking at least once {@link #tryAcquire}, * returning on success. Otherwise the thread is queued, possibly ...