Programmer Think

ioc of spring Before talking about ioc, I think we should first understand the dependency inversion principle, that is, the high-level module cannot directly rely on the low-level module, but should rely on the abstraction of the low-level module. This is to untie the code coupling. Then when we develop with this design pattern, we still have t ...

Bean life cycle preface For ordinary Java objects, the object is created when it is new, and is recycled by the garbage collection mechanism when it has no reference. For objects managed by the Spring IoC container, their life cycle is completely controlled by the container. The life cycle of each Bean in Spring is as follows: 1, ...

preface Some time ago, I learned about the netty source code from scratch, but they all understood it in principle. The blogger has just learned a little about the dubbo framework. This time, take the dubbo framework as an example to see in detail how the excellent open source framework uses netty and how it integrates with the logic of the fr ...

catalogue 1, Map interface 1. Map and Collection 2. Common methods in map interface 3. Map set traversal - keySet method 4. Entry interface 5. Map set traversal - Entry 6. HashMap stores user-defined type key values 2, Object oriented idea of set inheritance system 3, Mutual conversion of array and List 1. Convert Collaction to array 1, Map ...

Special invited author of enjoying learning class: Dream chasing youth Reprint, please state the source! ###Foreword When we do development, we always emphasize the concept of data type. In Java, it is divided into basic type and reference data type. There are eight basic data types. In addition to classes, we can also use the way of interfa ...

preface This article explains the result mapping of Mybatis. If you want to use Mybatis flexibly in enterprise development, you must be proficient in this part. What is result mapping? Simply put, it is how the fields returned by an SQL query statement correspond to the attributes in the Java entity class.The following SQL statement is used ...

##Foreword During the interview, it is also common for the interviewer to investigate "ThreadLocal", so it is very necessary to understand it thoroughly Some interviewers ask straight to the point: "Do you know ThreadLocal?" "Tell me about your understanding of ThreadLocal" Of course, some interviewers will slowl ...

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1) What is a python decorator? Python decorator is a very powerful function, an excellent design pattern, which abstracts the repeated content and gives a function other functions without changing the function itself. Simply put, modifiers are functions that modify the functions of other functions.It makes the code extremely concise and ...

1, Five basic data structures 1. Introduction to redis “Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker.” —— Redis is an open source (BSD licensed) in memory data structure storage, which is used as database, cache and message agent. (from the off ...