Programming VIP

Corresponding key and value in Map: "Dagu", "diga Altman" "Mountain", "Gaia Altman" "Li Xiangyang", "emperor Xia" 4. Objects to create the Map collection: Polymorphic way The specific implementation classes are HashMap, HashTable, ConcurrentHashMa ...

Six years ago, when I returned to Luoyang from Suzhou, I put in many resumes and interviewed many interviewers with a mentality of returnees, but only two or three satisfied me. One of them, Lao Ma, is still in my mobile address book. He threw an interview question at me: tell me the difference between basic type and packaging type. I was 23 y ...

1: Why AQS Locks and collaboration classes (semaphores) have something in common: they are similar to a gate (only some threads are allowed to pass through), because they all use a common base class AQS at the bottom Because many of the above collaboration classes work similarly, you can extract a tool class and use it directly. For Reentrant ...

summary The adjacency matrix is constructed from the given matrix List<List<Integer>> graph = new ArrayList<>(n); for (int i = 0; i < n; ++i) graph.add(new ArrayList<>(3)); for (int[] path : paths) { graph.get(path[0] - 1).add(path[1] - 1); graph.get(path[1] - 1).add(path[ ...

⌛ preface For the front end, css is a necessary knowledge for beginners. Basically, after dabbling in html, you learn css. At the same time, css is also a necessary knowledge point for the front-end, such as horizontal and vertical center, two column layout, three column layout and bfc, which are both common and necessary test points fo ...

I thought facial classics were just rote things before, but later I found that remembering them was really helpful to my understanding of knowledge. No wonder Chinese articles always require memorization. preface This face sorting is divided into the following parts. I hope it will be helpful to your work. contentLink addressJava Foundatio ...

Design patterns are widely used in development. Design patterns refer to the characteristics of our daily life and abstract the characteristics, so that some implementation can meet the specific requirements. Of course, this must be a flexible transformation, and the responsibility chain officially kicked off. I went to XX Internet company for ...

1, js scope Scope is the area (range) in which the variable works. 1. Global scope (outside functions and {}).2. Function scope (inside the function).3. Block level scope (newly added in ES6, in {}). Title: create 10 < a >, and click the pop-up serial number. 1. Global declaration sequence number i   <!DOCTYPE h ...

1, Know anti shake and throttling 1.1. Understanding of anti shake and throttling In fact, the concepts of anti chattering and throttling did not first appear in software engineering. Anti chattering appeared in electronic components and throttling appeared in fluid flow JavaScript is event driven. A large number of operations will trigger e ...

Recently, I met an interesting interview question. The question is very simple, but it involves a lot of small knowledge points. It's quite interesting. An ordinary for loop outputs i // Normally write a for loop and output i for (var i = 0; i < 5; i++) { console.log(i); } console.log(i); Suppose you are an interviewer, what will t ...