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This paper selects the 10 questions that have been liked most on StackOverflow, the world's second largest gay dating website, of which the total number of likes exceeds 50000. Considering many white whoring parties, at least 100000 people are interested in these questions! So many people like it, which shows two problems: 1. These problems ...

catalogue Build environment if choose,when,otherwise trim,where,set sql fragment foreach Dynamic SQL refers to generating different SQL statements according to different conditions under different circumstances Build environment database CREATE TABLE `blog`( `id` VARCHAR(50) NOT NULL COMMENT 'Blog id', `title` VARCHAR(100) NOT NUL ...

The whole process of class loading and runningpackage com.tuling.jvm; public class Math { public static final int initData = 666; public static User user = new User(); public int compute() { //A method corresponds to a stack frame memory area int a = 1; int b = 2; int c = (a + b) * 10; return c; ...

Thread pool Why do I need a thread pool In practical use, threads occupy resources very much, and poor management of them is easy to cause system problems. Therefore, in most concurrency frameworks, thread pools are used to manage threads benefit Using thread pool can reuse existing threads to continue executing tasks, avoiding the consumpt ...

(1) Analysis [1] In some scenarios, we want to obtain the current HttpServletRequest object in the Service business logic layer. A simple and direct processing method is that the HttpServletRequest object is passed to the next layer through method parameters, but this method is not flexible. We need a more general and flexible method. [2] ...

C++ friend functions and friend classes (C++ friend keyword) In C + +, a class can have members of public, protected and private attributes. Public members can be accessed through objects, and only functions in this class can access private members of this class. Now let's introduce an exception - friend. With the help of friends, member funct ...

After the client and server establish a tcp connection, srs will create an srsrrtmpconn object, start a thread, and eventually call this function. srs uses multiple coroutines. So the thread I'm talking about in srs is a coroutine. When there is no special description later, threads are coroutines. The original text of this function is as follo ...

❤ Write in front ❤ Blog home page: Hard working Naruto ❤ Series column: Java basic learning 😋 ❤ Welcome, friends, praise 👍 follow 🔎 Collection 🍔 Learning together! ❤ If there are mistakes, please correct them! 🌹 about [Chapter 10 Java collection] several brain maps take you into the brainstorming of Java collection 🔥 Extended analysis ...

Common class 1. Internal class Concept: define a complete class in an internal class characteristic: After compilation, an independent bytecode file can be generated.The inner class can directly access the private members of the outer class without breaking the encapsulation. Variables defined by private can be used internallyIt can pr ...

loop Dead cycle for loop: execution efficiency takes precedence over while for (;;) { Loop body statement; } while loop: more readable code while (true) { Loop body statement; } loop nesting Buy a hundred chickens for a hundred dollars: Spend 100 Wen to buy 100 chickens, 5 Wen for a rooster, 3 Wen for a hen and 3 Wen for a chick. S ...