Simple point - c-Lesson5 (structure, branch statement (if, switch), difference between p and * p)
1. Structure
(1) A structure definition is a collection that describes different data types or the same data type. (complex type) (2) Access structure: pointer access structure (- >); Variable name access structure (.) (3) The difference between p and * p depends on whether it is a left value or a right value.
#if 1
#include < ...
Posted by heminfotech on Mon, 16 May 2022 23:33:28 +0300
Python whole station automatic test - Python formatted output
Format output
python formats output in two ways: a percent sign and a format The function of format is more powerful than the percent sign method. The unique functions of format, such as custom character filling in blank, string centered display, binary conversion, automatic integer segmentation, percentage display and so on, cannot be com ...
Posted by johnh on Mon, 16 May 2022 23:30:34 +0300
Bridge pattern of structural mode
definition:
Separate the abstract part from its implementation part so that they can change independently. It is an object structure mode, also known as handle and body mode or interface mode.
The bridge mode is similar to the multiple inheritance scheme, but the multiple inheritance scheme often violates the principle of single responsibilit ...
Posted by Loki on Mon, 16 May 2022 22:12:08 +0300
[N1CTF 2018]eating_cms parse_url function vulnerability
Entering is a login interface. Just enter an account password and take a look
If you find a database statement, try the universal password
1'or'1'='1'#
It is found that it has been filtered. Generally, this kind of question has a register PHP and a place where you can read the source code, we need to find and try
If you find a registr ...
Posted by Pig on Sun, 15 May 2022 05:20:02 +0300
Implementation principle of Java thread pool -- thread pool blocking queue, rejection policy and Executors
1.BlockingQueue thread pool blocking queue
Blocking queue method
public interface BlockingQueue<E> extends Queue<E> {
boolean add(E e);
boolean offer(E e);
void put(E e) throws InterruptedException;
boolean offer(E e, long timeout, TimeUnit unit)
throws InterruptedException;
E take() ...
Posted by siobhan on Sun, 15 May 2022 04:46:08 +0300
The most complete and detailed explanation of three chess
If you want to write the sanbang code, you must have a start-to-finish idea:
First of all we have three files
game.h - declaration of the function
game.c - function implementation
test.c - test game
Create a menu (menu())
//menu selection interface
void menu()
{
printf("*****************\n");
printf("**** 1.play ****\n");
pr ...
Posted by commandonz on Sun, 15 May 2022 01:31:55 +0300
Spring learning notes: instantiation of Bean
catalog:
🥪 1, Instantiated Bean
🍬 1.1 environmental preparation
🍬 1.2 instantiation of construction method (common)
🍕 Step 1: prepare the class to be created
🍕 Step 2: configure the class to the Spring container
🍕 Step 3: write the running program
🍕 Step 4: provide constructor test in class
🍕 Step 5: change the constructor to pr ...
Posted by timc37 on Sun, 15 May 2022 01:17:37 +0300
In depth understanding of reflection class loading mechanism
catalogue
What is reflection?
Use reflection to get Class object
Class class
Common methods of Class
How to get Class
Class loading and ClassLoader
Class loader
Extension: parental delegation mechanism
Get properties of reflection class (file, method, constructor)
Create dynamic objects with reflections
What is reflection?
...
Posted by angel_cowgirl on Sun, 15 May 2022 01:05:42 +0300
My colleague told me that the reason why his code is silky is that he uses Mybatis Plus?
1. Pain points of mybatis
We know that MyBatis is a persistence layer framework based on java. It encapsulates jdbc internally, which greatly improves our development efficiency.
However, there are many pain points in developing with Mybatis:
Each Dao interface needs to define a bunch of addition, deletion, modification and query methods ...
Posted by greenber on Sun, 15 May 2022 00:18:14 +0300
Implement file upload and download function
Let’s first look at the three elements of file upload:
Form submission method: post (get method submission has size limit, post does not)Form's enctype attribute: must be set to multipart/form-dataThe form must have a file upload item: file
File upload introduction
To receive the files uploaded by the client page, the server usually ...
Posted by jdc44 on Sat, 14 May 2022 00:38:50 +0300