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  String intern in Java


In Java, == is used to compare whether two objects have the same memory location, equals() is usually used to compare whether two objects have the same time and the same state.  When comparing two strings, normally we just want to know whether they have same content, so we can choose equals(). But since String comparison is so frequently needed, Java has worked on the String class to make == workable when comparing two String literals. The String class maintains a pool of emp...

   JAVA,STRING     2016-04-10 03:35:25


  <=> operator in MySQL


Have you ever seen "<=>" in a SQL query while using MySQL? Does it mean less and equals to and greater than? Actually if you consider it as the union of <= and =>, great, you are close to it. This is one form of equal operator in MySQL, it has the similar meaning to the = operator with some subtle difference. According to MySQL documentation, <=> is NULL-safe equal. This operator performs an equality comparison like the = operator, but returns 1 rather than NULL if both operand...

   MySQL,NULL safe,<=>     2014-03-24 06:23:22


  C++, Ruby and CoffeeScript complexity comparison


There are many programming languages around the world, they all designed to help programmer solve some problems, finish some tasks. These languages are often divided into different types, there are structural, object-oriented, functional, scripting languages etc. Some are easy to pick up such as Java, while some are thought to be difficult to learn such as C++. So how do we understand complexities of different programming languages?Many people agree that C++ is very complex languages, it has poi...

   Complexity, languages, C++,Ruby,CoffeeScript     2012-06-12 04:46:01


  Arrays.equals() vs MessageDigest.isEqual()


Both Arrays.equals() and MessageDigest.isEqual() are used to compare the equality of two arrays. They can be interchangeably in many cases. However, they do have some differences which lead to different use cases in real applications. One difference is that the arrays passed to MessageDigest.isEqual() cannot be null while it's ok for Arrays.equals(). The one major difference between these two methods is that Arrays.equals() is not time-constant while MessageDigest.isEqual() is time-constant. Thi...

   Arrays.equal(),MessageDigest.isEqual(),Java,Security     2015-05-14 22:03:29


  Function Pointers in C are Underrated


The function pointer in C is, in my opinion, one of the most ignored gems of the language. It’s the kind of feature you rarely need, and then suddenly, one day, you find yourself in dire need of it, as evidenced by the real-life use-case below. If you don’t know what a function pointer is in the first place, here’s the meat of it: it gives you the ability to pass a function around like a normal variable. If you know Python / Ruby / Lisp, you might know it by the name ‘lambda’, ...

   C,Pointer,Analysis     2012-03-24 05:23:09


  Flash, HTML5 comparison finds neither has performance advantage


A comparison of streaming video via the Adobe Flash and HTML5 formats with numerous different browsers on both Mac and Windows produced wildly different results based on the operating system and browser, making neither a clear winner. The test, from Streaming Learning Center, was conducted in response to recent comments alleged to have been said by Apple co-founder Steve Jobs, in which he reportedly called Flash a "CPU hog." While the test found that HTML5 is significantly more efficient th...

   html5,flash,performance,comparison     2011-07-01 10:08:00


  Google to build Google Babble to unify all its chat tools


--Note : Image is from www.36kr.com If Google Talk / Hangout / Voice / Messenger are put  together, what will you find?They are all chat tools launched by Google, but with careful comparison, you will find that the difference between them is not very big. The useful tools are Google Talk and Google+, but both of them needs to be improve their user experience.According to Geek.com, Google is planning to launch a chat application Google Babble which will integrate all its chat tools and serv...

   Google Babble,Chat tool     2013-03-19 13:02:47


  Say good bye to netbook


Asus and Acer are the last two manufacturers of netbooks, but these two companies announced that they would not manufacture netbooks starting from January 1, 2013. Prior to them, Samsung, Hewlett-Packard and Dell stopped production of the netbooks. This means that the life cycle of netbook officially ended.Back to 2009, the U.S. market research firm ABI Research was very optimistic about netbook's future, they said netbook would open a new era for PC market and predicted netbook shipments would ...

   Netbook,Tablet PC, Comparison     2013-01-02 11:53:33


  sorting in C++: 3 times faster than C.


If you don't know C++ well, you might be surprised how fast C++ can be sometimes. This is especially true when code involved is small, because then inlining - which is what C++ is very good at - and templating, which makes excessive inlining possible in the first place - has the most effect. The following code compares C and C++ sorting:  #include <iostream>#include <algorithm>#include <vector>#include "stop_watch.inl" // see https://...

   C++,Sorting,C,faster,efficiency     2012-03-17 12:59:45


  mysql_fetch_array(),mysql_fetch_assoc() and mysql_fetch_row()


In PHP MySQL mannual. There are three functions which need to be clarified for some users who may get confused when choosing which one to use to get the result. mysql_fetch_array() : by seeting the different parameters, there are three ways to return the result set. MYSQL_ASSOC(Result set with field names as the associative indexs.It means you can use the field name as the index to get value of the specified cell). MYSQL_NUM(Result set with field names as the number indices). Or MYSQL_BOTH(...

   PHP,MySQL,resultset,comparison,mysql_fet     2011-08-05 04:53:09