Refactoring: reorganizing functions

1, Put a piece of code into a separate function 1.1 code example 1.2 application scenarios When there is an overly long function or a piece of code that needs comments to make people understand its purpose, put this code into a separate function. 1.3 benefits First, there is a greater chance that functions can be reused with each ...

Posted by TheIceman5 on Wed, 10 Aug 2022 21:29:37 +0300

Java object orientation: the ultimate training of interfaces

Problem description There are four roles as follows. The attributes and behaviors of these roles are Stock investors: name, age, study stock speculation, speak English Fund Investor: name, age, study and speculation Stock Manager: name, age, teaching stock trading, speaking English Fund manager: name, age, teaching and speculation base Pl ...

Posted by ballhogjoni on Tue, 09 Aug 2022 21:47:12 +0300

Encapsulation, inheritance and polymorphism of java

encapsulation Characteristics of encapsulation: data can only be accessed through specified methods.Hide the instance details of the class to facilitate modification and implementation.Specific practical steps of packaging Modify the visibility of attributes to restrict access to attributes, which is generally set to private.Create a pa ...

Posted by zz50 on Tue, 09 Aug 2022 21:33:18 +0300

Javac compilation custom annotation and analysis annotation implementation of Lombok

1, Ask questions with Lombok 1.1 INTRODUCTION 1. Open settings (shortcut key: ctrl+alt+s) in idea, search plugin, search lombok in plugins, and install 2. Introduce lombok dependencies into the project <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version&gt ...

Posted by jf3000 on Tue, 09 Aug 2022 11:59:23 +0300

2022/07/29 jisoft Java Foundation (14) exception handling

1, What is exception handling Exception handling is also called exception handling. There are two purposes to deal with exceptions in the program, one is to find the exceptions in the program, and the other is to operate the exceptions relatively or notify the programmer to modify them. Using the try catch statement can accomplish these two pur ...

Posted by bothwell on Sat, 06 Aug 2022 21:26:11 +0300

NIO Selector execution process

1, What is Seletor? The literal meaning of selector is not easy to understand. Seletor is a listener that can listen to events in the Channel. Channels can be registered in the seletor. When these registered channels have events, the seletor's select method will return these events to the thread for processing. 2, The difference bet ...

Posted by Fari on Tue, 02 Aug 2022 21:10:27 +0300

Kotlin - delay initialization and sealing classes

1, lateinit delay initialization keyword Many syntax features in Kotlin, such as variable immutability, variable non nullability, and so on, are designed to ensure program safety as much as possible. For example, there are many global variable instances in your class. In order to ensure that they can meet Kotlin's null pointer check sta ...

Posted by Cut on Sun, 31 Jul 2022 22:28:16 +0300

Java from getting started to giving up 06 (what is object-oriented?)

What is object-oriented? Process oriented The process oriented method of solving problems is to follow the steps we have analyzed, step by step, follow the principle of top-down and gradual refinement, and focus on the process and steps of solving problems. object-oriented Java Language is an object-oriented programming language, and obj ...

Posted by the_ut_tick on Sat, 30 Jul 2022 22:17:10 +0300

Automatic recognition of nucleic acid detection time by software using OpenCV

Question introduction In the program engineering training course, a problem occurred: Mobile phone screenshot nucleic acid detection report, using OpenCV software to automatically identify whether the time for nucleic acid detection is within 72 hours. I. Preparations Software needed to accomplish this task: - Python3.x - OpenCV-Py ...

Posted by fitzromeo on Sat, 02 Jul 2022 22:04:45 +0300

Write, append, read, and copy of golang files: examples of using bufio packages

Write, append, read and copy operations of golang files There is an OpenFile function under the os package of the Go language. Its prototype is as follows: func OpenFile(name string, flag int, perm FileMode) (file *File, err error) Where name is the file name of the file. If you are not running under the current path, you need to add the spe ...

Posted by teddmcload on Thu, 30 Jun 2022 16:56:27 +0300