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As mentioned earlier, the snowflake algorithm uses System.currentTimeMillis() to obtain time. There is a saying that System.currentTimeMillis() is slow because each call will deal with the system. In the case of high concurrency, a large number of concurrent system calls are easy to affect the performance (calling it is even more time-consuming ...

1. Article 1 call timing onLayout will be called during initialization loading and placement, but when was this onLayout called? The onLayout method of recyclerView is as follows: @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { TraceCompat.beginSection(TRACE_ON_LAYOUT_TAG); dispatchLayout(); Trace ...

ES core syntax (2) Array array An array is a set of values arranged in order. When storing values, the array adds an index value to each element. The entire array is represented by []. var arr = [1,2,3,4]; The above code creates an array, which includes four elements. Each element is assigned an index by default. It can be viewed by printing. ...

More articles are detailed in the official account [front end css and js dry cargo].Promise is the most exciting feature of Es6. Before that, people may have used promise through third-party libraries such as Bluebird or Q, but it did not become a standard feature of js until 2015.The Promise object represents the completion (or failure) of an ...

preface Last Saturday, a group friend @ said that Gitee's feedback module added a screenshot function. I went to experience it and found that they used my plug-in 😁， This article will share this plug-in with you. All interested developers are welcome to read this article. Plug in address and implementation principle This plug-in is impleme ...

1, Data structure Preface 1. Data structure: data and organization between data 2. Program (data and function composition) = data structure + algorithm 3. Time complexity Concept: the number of execution times of a statement of an algorithm program (rather than the running time of the algorithm); Time complexity is a function T ...

Article catalog1. clojure running separately2. Installing leiningenInstallation method 1:Installation method 2:3. Use Intellij Idea as the development IED4. Running and packaging lein projects5. project.clj configuration of leiningen build tool1. clojure running separatelyAs for what clojure is, you can baidu by yourself. In short, it is a prog ...

Hello, I'm Monday.We have talked about merging and sorting in recent algorithms. We'll open another one today. Two more questions.1, Greater than twice the number on the rightI'm afraid everyone will forget Merge sort , so practice with a question first.1. Title DescriptionFind the number in the given array that the current number is greater th ...

architecture design We can divide the functional architecture of Mybatis into three layers: API interface layer: interface APIs provided for external use. Developers use these local APIs to manipulate the database. As soon as the interface layer receives the call request, it will call the data processing layer to complete the specific da ...

shell script deployment springboot (Revised) explain The shell deployment springboot was sorted out before website: https://blog.csdn.net/shaoming314/article/details/120145215 However, the shell script does not have the option to stop, view and restart the service. It is not very good. This revision supports the options of stopping, restart ...