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  How does Class box get 1 million users with only 4 people?

"Class box" is an app which helps students create course plan developed by 4 Chinese. This app was created in 2012. They get over 1 million users with only 4 people. How do they make this? The co-founder of "Class box" Tianfang Li explains this on Zhihu. Here is what he said: About millions of users, in the mobile Internet era what we need to do is just find a good entry point, rapid iteration and with a little luck, a small team or even an independent developer can make millions user level prod...

   class box,team size,sillicon valley     2013-04-03 08:08:21

  Statistics on StackExchange

StackExchange is the most popular and professional IT Q&A site, Under StackExchange, there is StackOverflow and other sub sites. Many of us may wonder how this mega site is maintained and what its performance is. A performance page has been released by StackExchange recently. Below is some statistic about this mega site. 560 million page views per month, i.e around 1.9 million PVs per day. For such as big site, it has only 9 web servers and 4 SQL servers(while two of them are in backup mode...

   Stackoverflow,statistic     2015-01-05 02:47:01

  Java SynchronizedList and Iterator

While reading some material about concurrency, I come up with some writing about using SynchronizedList wrap about normal List to enable synchronization.   But one interesting thing is http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#synchronizedList%28java.util.List%29   It says     It is imperative that the user manually synchronize on the returned list when iterating over it:     1   List list = Collections.synchronizedList(new A...

       2015-12-03 03:04:08

  Implementation of Tower of Hanoi

The Tower of Hanoi is a mathematical game or puzzle. It consists of three rods, and a number of disks of different sizes which can slide onto any rod. The puzzle starts with the disks in a neat stack in ascending order of size on one rod, the smallest at the top, thus making a conical shape. The objective of the puzzle is to move the entire stack to another rod, obeying the following rules: Only one disk may be moved at a time. Each move consists of taking the upper disk fro...

   Algorithm,Tower of Hanoi     2012-08-20 02:15:55

  Steve Jobs attacks Android just for show?

Steve Jobs has a famous statement which says Android is a stolen product. What does Google CEO Larry Page think about this statement? Recently, Page said in an interview with Bloomberg Businessweek that Apple hates Android just for show. He believes people should not look only to the competitions, but should focus on the potential cooperation opportunities to make the world better.The following is overview of the interview:Q: When you took over as CEO, one of your goals was to take the cle...

   Steve Jobs,Android,Larry Page     2012-04-08 08:30:33

  Why Microsoft chooses Alt+F4 to close a window

For a long time, there is a doubt among lots of Windows users especially those English speaking users, that is why Microsoft chooses Alt+F4 to close a window instead of Alt+Q. Alt+Q is more comfortable to press for many keyboards, also Q represents Quit and it is easier for people to understand. Recently Microsoft answered this doubt. Raymond Chen, longtime Microsoft developer and semi-official Windows historian, said the reason is that not everyone speaks English. It d...

   WINDOWS,MICROSOFT,HISTORY,ALT+F4     2016-02-23 09:56:41

  var in JavaScript

Geoff published an article sometime ago--"How one missing var ruined our launch". This article described one case where MelonCard uses Node.js as their backend system, suddenly there was a small registration peak period--50-100 people registered concurrently, then the entire website stopped responding and many other strange problems showed up. When they were investigating the source of the problem, they found one missing var in the following code.app.all(‘/apps/:user_id/status’, fun...

   JavaScript,Scope,variable     2012-05-26 12:35:36

  Will HTML5 ever overtake native mobile apps?

Since now HTML5 has become a very hot topic. It can be used develop some highly functional and amazing applications on desktop and mobile devices. Also, there are many libraries which are using HTML5 to develop some native app like applications on iPhone and Android systems such as PhoneGap. Someone on Quora asked a question which many people are concerning about.: Will HTML5 ever overtake native mobile apps? It seems that the number of people who are agreeing with it equals to the number of peo...

   HTML5,Native app,Mobile     2012-05-10 06:51:46

  When will resizing be triggered in Java HashMap?

HashMap is one of the most frequently used collection types in Java, it stores key-value pairs. Ideally it expects to use hash table which expects the data access time complexity to be O(1), however, due to hash conflicts, in reality, it uses linked list or red-black tree to store data which makes the worst case time complexity to be O(logn).  Although collections are using data structures like arrays and linked lists, unlike arrays, they will dynamically resize when there is not enough spa...

   JAVA,RESIZE,HASHMAP,THRESHOLD     2020-05-02 20:41:19

  Understand how Larry Page leads Google judging by what he says

Larry Page is the head of one of the world's greatest companies : Google. For a long period of time, Page and the other co-founder Sergey Brin managed the company together. In 2001, Eric Schmidt took over the company, became Google's chairman and CEO. Until 2011, Page replaced Schmidt as the company's CEO.Page has undoubtedly played a pivotal role in Google's development. How did he push Google to today's height? Some of his quotations might be able to give the answer to this question. In my op...

   Larry Page, Google,Quotation     2012-12-09 11:26:59

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