today, let's talk about Lambda, which has puzzled me for a long time. Why do you say that? Because I never took the initiative to learn Lambda before. I didn't think about a lot of code using Lambda expressions. But recently, this Lambda expression appeared a little frequently, which affected my next study, so I went to learn it ...
Posted on Mon, 06 Dec 2021 14:49:41 -0500 by scuzzo84
[Log] Log framework in Java (I) JUL, Log4j [Log] Log framework in Java (middle) JCL and SLF [Log] Log framework in Java (Part 2): logback and log4j2
1. logback learning
1.1 logback introduction
logback is another open source log component designed by the founder of log4j, and its performance is better than log4j
logback is mainly divided in ...
Posted on Mon, 06 Dec 2021 14:10:51 -0500 by Tsukiyomi
SpringBoot -- container function
1. Component addition
First, create two bean s, one called User and the other called Food.
Previously, in SSM, component and attribute injection needed to be set in the Configuration file. The whole process can now be implemented in full code using SpringBoot. Create a Configuration class, mark it with @ Conf ...
Posted on Mon, 06 Dec 2021 13:46:14 -0500 by graphic3
1. What is a GUI
The full name of GUI is Graphical User Interface. Graphical interface or graphical user interface refers to the user interface of computer operation environment which is displayed graphically. GUI is easier for users to use than the command line interface used by earlier computers. The wide application of GUI is one of the ...
Posted on Mon, 06 Dec 2021 13:20:29 -0500 by snteran
Introduction: Circular dependency is a circular nested reference in N classes. If this circular dependency occurs in our daily development as a new object, the program will be called circularly at runtime until a memory overflow error occurs. Here's how Spring solves circular dependencies.
First: Constructor Parameter Cyclic Dependency
The Sp ...
Posted on Mon, 06 Dec 2021 12:50:43 -0500 by fhil85
The redis server uses port 6379 by default to communicate with the outside world, so we can actually implement a simple redis client on our own. This is done in java. Implementing a redis client consists of two main parts
socket communicationEncoding and decoding of redis communication protocol
The second part is mainly the implementation of ...
Posted on Mon, 06 Dec 2021 12:49:12 -0500 by goobers
1. Introduction to ArrayList
At the bottom of the ArrayList is an array queue, which is equivalent to a dynamic array. Compared to arrays in Java, its capacity can grow dynamically. Applications can use the ensureCapacity operation to increase the capacity of ArrayList instances before adding a large number of elements. This reduces the number ...
Posted on Mon, 06 Dec 2021 12:20:50 -0500 by Nikos7
Local file upload and access service
The core content of this chapter is to introduce the distributed file system, which is used to store the image, word, excel, pdf and other files of the application. Before introducing the distributed file system, let's introduce the use of native storage to store file resources.
The core implementati ...
Posted on Mon, 06 Dec 2021 00:21:24 -0500 by bluejay002
Time limit: 1.0s Memory limit: 256.0MB
You have a NxN pixel photo of a certain sea area, "." represents the ocean and "#" represents the land, as shown below: ....... .##.... .##.... ....##. ..####. ...###. ....... Among them, a piece of land con ...
Posted on Mon, 06 Dec 2021 00:18:23 -0500 by dannel77
1. Comment statement
(1) Paragraph comment: "/ * * /" (2) statement comment "/ /"
Words with special meanings: 1. All lowercase; 2. Special color mark
3. Data type
Numerical typeSymbol / byteNon numerical typeSymbolintegerbyte(1),short(2),int(4),long(8)Booleanboolean(1)Floating point numberfloa ...
Posted on Sun, 05 Dec 2021 23:31:34 -0500 by blurredvision