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Content: 1. What is one-time initialization? Example 1: one time initialization verification of pthread ﹣ once function: #include"stdio.h" #include"unistd.h" #include"sys/types.h" #include"pthread.h" #include"stdlib.h" #include"string.h" pthread_once_t once = PTHREAD_ONCE_INIT;//Declare global var ...

The new requirements need to make some customized things on log4j, so the log4j2 is supplemented To configure Let's look at the traditional configuration of log4j2 <?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <properties> <property name="log_path"&gt ...

Parameter binding stay The fifth chapter Feign is used to implement a REST service binding without parameters. However, in the actual business, it is much more complicated than this. Different types of parameters are passed in at various locations of HTTP requests, and the returned parameters may als ...

Catalog Preface HashTable and ConcurrentHashMap data structure Class Segment attribute put(K key, int hash, V value, boolean onlyIfAbsent) remove(Object key, int hash, Object value) Class HashEntry attribute Construction method Core method put(K key, V value) get(Object key) size() remove(Object k ...

In web development, the separation of front and back development has been deeply rooted in the hearts of the people. Such a development mode is very useful for the development of elegant and beautiful web applications. I have consulted some materials on the Internet and learned to use the unified format ...

Starting with business applications, this paper abstracts a floating window tool class from scratch that can be used to display floating windows on any business interface.It can manage multiple floating windows at the same time, and floating windows can respond to touch events, can be dragged, and have side animations. The sample code is writt ...

Form operation Form scope modifier Number: converts the form value to a number data:{ inputmsg:'123' } <input type=text v-model.number="inputmsg">//The value of this form is output as data trim: remove spaces at the beginning and end of the form data:{ inputmsg:' 123 ' } <input ty ...

Abstract: This blog post is for the crowd: WPF novice. Blog content: make TextBox Style template including empty Button through Style, and empty TextBox content by introducing additional attributes of custom class into Style.Purpose of the blog: to help new WPF developers or those in need to quickly und ...

iOS underlying learning-day-16 Preface - OC grammar problem runtime API-01 class Dictionary to model example runtime API-04 method replacement Preface - OC grammar I am an iOS developer. I am a rookie at the bottom of iOS for 30 days. problem What is Runtime? Has it ever been used in normal ...

Application Security cookie Ordinary cookie What do we usually have in our user list When you are shopping, join the shopping cart and let you log in. After you log in, how does he know you are logged in The value of token is random and exists in the cookie Set up Prototype: how to set cookie s ...