Xuanzi Java Basic Notes 2

User interaction Basic Scanner package CH02_JAVAProcessControl; //Basic Scanner import java.util.Scanner; //Guide package public class XZ01_UserInteraction { public static void main(String[] args) { Scanner input = new Scanner(System.in); //Create a Scanner object System.out.println("Please enter 1"); if (input.h ...

Posted by marsooka on Mon, 28 Nov 2022 07:52:35 +0300

[Java]Basic knowledge of interview

#[Java]Basic knowledge of interview review it yourself foreword Looking for a job recently, discipline the basics of Java 1. Basic data types 1. Difference and conversion between int and Interger the difference 1. Integer is a wrapper class for int, which is a basic data type of java 2. Integer variables must be instantiated ...

Posted by tengkie on Sun, 04 Sep 2022 12:38:21 +0300

Python homework - Crawler + visualization + data analysis + database (data analysis)

Personal blog Python homework - Crawler + visualization + data analysis + database (brief introduction) Python homework - Crawler + visualization + data analysis + database (crawler) Python homework - Crawler + visualization + data analysis + database (visualization) Python homework - Crawler + visualization + data analysis + database (dat ...

Posted by Dima on Sat, 13 Aug 2022 21:32:58 +0300

This article explains the database operation in python in detail

Database operation in python 1, Database programming interface 1. Connection object 2, Use built-in SQLite 1. Create database file2. Operate SQLite 3, Use of MySql database 3.1 install MySql3.2 setting environment variables3.3 start MySql3.4 using navicat for mysql management software3.5 installing PyMysql module3.6 connecti ...

Posted by fitzsic on Fri, 12 Aug 2022 21:54:17 +0300

JVM memory structure

JVM introduction 1. What is a JVM? java virtual machine - the running environment of java programs (java Binary Bytecode operating environment) 2. Benefits of JVM The cornerstone of writing once and running everywhere [key]Automatic memory management, garbage collection function [key]Data subscript out of range checkPolymorphism, object-ori ...

Posted by mike0193 on Fri, 12 Aug 2022 21:44:05 +0300

[JavaEE advanced series from beginners to engineers] detailed explanation of exception handling and solutions in JavaEE (including throws declaration exception and throw keyword)

Article catalogue ?? More relevant knowledge?? 1, View exception information ??public void printStackTrace()??public String getMessage()??public String toString() 2, Exception handling - throws declares an exception 1. Why do I need throws?2. Format of throws ? Code demonstration 3. Usage scenarios of throws4. Notes on the ...

Posted by Antnee on Wed, 10 Aug 2022 21:37:40 +0300

Java thread pool multi thread query database to improve query efficiency

Java thread pool multi thread query database to improve query efficiency demandproblemthinkingcodeanalysis demand Company data statistics report query, several large table Association query, including cross database query, data associated query, data filtering, data statistics. problem Main table data 1 Main table data 2 ... Statis ...

Posted by ryadex on Tue, 09 Aug 2022 22:06:04 +0300

[uiautomation] wechat friend list acquisition (stored in txt)

??? ?? Blog homepage: **** ?? Series column: uiautomation ?? Welcome to like?? Comments?? I love python and look forward to growing up with you!! Purpose: use uiautomation to get wechat friends and store them in txt files. catalogue 1, Foreword 2, Specific steps Module import Open wechat Enter address book management Locate ...

Posted by lizzyd on Tue, 09 Aug 2022 13:03:39 +0300

One financial APP system every day [Android end + front end + back end]

Yesterday, a fan friend also wanted to learn how to develop Web, applet and Android. He asked if he could learn it in college? What I learned in school is really limited: In many colleges and universities, some professors are academic, and they have not done much development work. In class, they just follow the book, and their knowledge point ...

Posted by skali on Thu, 04 Aug 2022 21:47:07 +0300

A simpler way to use Spring

Some of the most basic methods of storing and reading Bean objects have been described before, but they are not used in Spring at all. So this blog will introduce a simpler method of storing and reading Bean objects. The core of what you want to do is to use annotations. Let's take a look below. Catalog ?? Store Bean Objects ?? ...

Posted by The14thGOD on Thu, 04 Aug 2022 21:30:46 +0300