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Stopwatch is interpreted as a timer, also known as stopwatch and stop watch. Obviously, it records time. How to use Stopwatch stopwatch = Stopwatch.createStarted(); doSomething(); stopwatch.stop(); // optional long millis = stopwatch.elapsed(MILLISECONDS); // formatted string like "12.3 ms"} log.info("time: " + stopwatch); Android ...

CSS realizes various methods of horizontal, vertical and horizontal centering of box model CSS method for realizing horizontal centering of box model Global style .parent { color: #FFFFFF; height: 200px; width: 200px; margin: 0 auto; background-color: #000000; } .child { width: 50px; height: 50px; background-color: #26f12d; } First ...

Prepare the following code in advance, start from the server construction, and deeply analyze the startup process of Netty server. public class NettyBasicServerExample { public void bind(int port){ //The server programming of netty should start with EventLoopGroup, // We want to create two eventloopgroups, // One ...

In the last article, we introduced the basis of threading. I believe everyone has a general understanding. This article is about thread sharing and collaboration. Let's have a look! 1, Sharing between threads Synchronized synchronized is a keyword in Java. It is a kind of synchronous lock. It modifies the following objects: 　　1. Mod ...

Startup process of root Activity The overall process of starting the root Activity is as follows: It is mainly divided into four parts The Launcher requests ATMS to create a root ActivityATMS will request zygote to create the application processzygote to create application processATMS requests ApplicationThread to create a root Activity I ...

I What do you know? HashMap, TreeMap, ConcurrentHashMap, LinkedHashMap II What are the characteristics of HashMap? Null Key and Value are allowed, but only one record Key can be null Thread unsafe disorder The data structure is array + linked list / red black tree (JDK1.8) III JDK1. Why does HashMap in 8 introduce red black tree? Link ...

I am an undergraduate graduate, 21 graduates, one year of work experience, resume professional skills are as follows, based on the resume, and review the knowledge learned to prepare for interviews. Recorded date: 2022.1.4 Most of the knowledge points are only introduced in general, and the specific content is reviewed in detail according ...

JavaScript Why is javascript single threaded? If js is multithreaded and multiple threads operate on DOM elements at the same time, which thread is the main one is a problem The new HTML5 standard allows the use of new Worker to start a new thread to run a separate js file script, but the new thread strictly requires the functions that can b ...

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Go concurrent scheduling advanced - [gongzong No.: stack future] original text 3. Cyclic scheduling All GMP initialization has been completed. It's time to start the runtime scheduler. We already know that when all the preparations are completed, the last call to start execution is runtime Mstart. Main functions of mstart: Determine the ...