Java ---- URL and URLConnection
The java.net.URL class encapsulates the URL address and provides basic methods to resolve the URL address, such as obtaining the host name and port number of the URL. java.net.URLConnection represents the communication link between the application and the URL, which can be used to read and writUTF-8...
Posted by Wien on Tue, 21 Sep 2021 12:44:08 +0530
01 - first knowledge of object-oriented
First knowledge of object-oriented Classes and objects What is an object? Object is a very important concept in programming language and real world. The so-called "all things are objects" means that the objective things existing in reality are objects. What is object oriented? ① Suppose we go tUTF-8...
Posted by madhouse92 on Tue, 21 Sep 2021 13:09:53 +0530
centos 7 compiles and installs mysql and adds mysql to system services
preface LNMP environment construction (I): Mysql MySQL will be installed with a MySQL function library, which will be used when installing PHP. After PHP is successfully installed, a PHP FPM process will be generated to provide fastcgi service. After Apache or Nginx is installed, relevant settUTF-8...
Posted by komquat on Tue, 12 Oct 2021 09:17:30 +0530
Achieve nginx daily log segmentation under Linux (shell + scheduled task + nginx signal management)
preface 1. Practical application: shell + scheduled task + nginx signal management, complete log storage by date, analysis idea: 00:00:01 a.m., rename yesterday's log and put it in the corresponding directory. Then the USR1 information number controls nginx to regenerate a new log file. CrontaUTF-8...
Posted by FlyingIsFun1217 on Tue, 12 Oct 2021 10:01:54 +0530
JAVA optimization interview points
1. MyBatis do not write 1 = 1 for multiple query criteria When multiple query conditions are encountered, using where 1=1 can easily solve our problem, but it may cause very large performance loss. Because after adding the "where 1=1" filter condition, the database system cannot use query optimUTF-8...
Posted by jtacon on Fri, 15 Oct 2021 06:19:02 +0530
Some supplements to mysql database
Database concept A database is where data is stored. In the computer, in the memory and in the hard disk, everything is stored in the database. The place where these data are stored is called the database. It can also be called electronic "filing cabinet". The database in computer science and UTF-8...
Posted by jmgarde on Sat, 16 Oct 2021 10:54:07 +0530
Java advanced - common classes
9.1. String related classes Understand the immutability of String String: a string represented by a pair of "" 1.String is declared as final and cannot be inherited 2.String implements the Serializable interface: it means that the string supports serialization, that is, the string can be turnedUTF-8...
Posted by daanoz on Thu, 21 Oct 2021 00:58:41 +0530
jvm class loading process, class loader and parental delegation model
1, JVM structure jvm is mainly composed of class loader, runtime data area and execution engine A java file is compiled and loaded by the jvm into the execution process: 2, Class loading process Load - > connect (verify - > prepare - > resolve) - > initialize - > use - > uninstall 1. Loading 1.UTF-8...
Posted by Locust on Thu, 21 Oct 2021 04:22:19 +0530
Three characteristics of Java -- encapsulation and inheritance
1. Encapsulation (key) Three characteristics of object-oriented: encapsulation, inheritance and polymorphism //Object oriented case: car starting //Analysis: Category: vehicle category Object: new Attributes: color, brand, etc Method: start //Problem: the price can be assigned as a negative numUTF-8...
Posted by undecided name 01 on Thu, 21 Oct 2021 05:29:31 +0530
c# GDI + simple drawing
Author: stg609 The copyright of this article belongs to the author and the blog park. Reprint is welcome, but this statement must be retained without the consent of the author, and the original connection must be given in an obvious position on the article page, otherwise the right to investigaUTF-8...
Posted by ftrudeau on Thu, 21 Oct 2021 05:49:53 +0530