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Why use packaging class Although Java is an object-oriented programming language, it contains eight basic data types, which do not support the object-oriented programming mechanism. The data of these basic data types does not have the characteristics of "object", such as no property and no m ...

Python basic tutorial I. Introduction 1.1 introduction to Python Founder of python: Guido Van Rossum Python download address: https://www.python.org/ Python document download address: https://www.python.org/doc/ Pycharm download address: https://www.runoob.com/w3cnote/pycharm-windows-install.html ...

This article is [ From scratch, let's learn and develop a Flutter App together ]The second article on the road. This article will solve the problem left by the previous article: how does asynchronous processing work in Dart? First, we briefly introduce Future, sync and await, which are commonly used in Dart; second, we try to analyze the async ...

1: Thinking and explanation of inheritance in OO Inheritance contains such a meaning: all implemented methods in the parent class are actually setting specifications and contracts. Although it does not force all the subclasses to follow these contracts, if the subclass modifies these implemented meth ...

A heavy snow covered North and East China. The heaven and the earth are linked together, and the city is covered in silver, which is full of poetic and picturesque feelings, and everyone is in high spirits. Friends circle is painted by snow pictures and jokes about road skating and wrestling, and the at ...

OpenGL Experiment 1 OpenGL (English: Open Graphics Library) is a cross language, cross platform application programming interface (API) for rendering 2D, 3D vector graphics. This interface consists of nearly 350 different function calls, which are used to draw from simple graphics bits to complex 3D s ...

Personal blog http://www.milovetingting.cn Simple use of AspectJ in AOP Definition of AOP AOP is the abbreviation of Aspect Oriented Programming, which means: a technology to realize the unified maintenance of program functions through precompiling and dynamic agent during operation. The above definition of AOP is quoted from Baidu Encyclope ...

I use jdk version 1.8. hashCode is a local method in the Object class, which means that all objects inherit its hashCode method. Without much nonsense, let's first look at the introduction of hashCode method in the Object class: /** * Returns a hash code value for the object. This method is ...

0113 asynchronous method and timing task of spring background spring has a lot of content, and the general knowledge must be systematically learned, but some edge technology points are also very applicable in the actual work; here is an introduction and practice one by one. Asynchronous thread pool Scenario: the distribution task is separate ...

Step 1: Check the JDK View the JDK version and type: java-version on the command line [root@test ~]# java -version bash: java: command not found As above, prove that your linux is very clean, go directly to Step 2 Or the following [root@test ~]# java -version openjdk version "1.8.0_102" OpenJDK Runtime Environment (build 1.8.0_102-b14) OpenJD ...