SEARCH KEYWORD -- Method chaining
Linux Clock : CST,UTC and NTP setup
1. There is an option when you set up clock on installing Linux: system clock users UTC, so what does UTC mean? It's Universal Time Coordinated(UTC), there are two different times in GPS system: one is UTC , the other one is LT(Local Time). The difference between these two is just the timezone difference, UTC is the time in timezone 0. If the local time in Beijing is 8 o'clock in the morning, then UTC time is 0 o'clock, which is a 8 hour difference. 2. In Linux, when we use date to check the tim...
Why Dynamic Programming Languages Are Slow
In a statically typed language, the compiler knows the data-type of a variable and how to represent that. In a dynamically-typed language, it has to keep flag describing the actual type of the value of the variable, and the program has to perform a data-dependent branch on that value each time it manipulates a variable. It also has to look up all methods and operators on it. The knock-on effect of this on branching and data locality is lethal to general purpose runtime performance. T...
Dynamic language,Slow,Analysis 2012-03-26 15:33:11
Add ContextMenu to a customized View in Android
In Android, we may sometimes need to add ContextMenu to a View, it's not so easy to add ContextMenu to a customized View. Here we explain how to add ContextMenu to a customized View. First, we may need to create View.OnCreateContextMenuListener so that the customized view can register for it. Here is the class definition: public class GraphView extends View { private View.OnCreateContextMenuListener vC = new View.OnCreateContextMenuListener() { &...
Android, ContextMenu,Customized view 2012-11-04 07:10:40
Video website in big data era
Big data initially means the large data set which is not able to be analyzed, but later it was derivatized to the method to analyze huge amounts of data in order to gain great value.This is a form which gradually gets attention, It's difficult to analyze these data and it's also difficult to store these data and it needs some unprecedented way, Now in China many companies use the open source Hadoop distributed data cluster to meet the needs of data statistics. Since we can get segmented d...
Netflix,Big data,Data mining 2013-04-11 04:20:40
When and Where to Use Pointers in Go
When declaring variables in Go, we usually have two syntax options: In some scenarios, pointers; in others, reference; sometimes, either. It’s great to have choices, but it is also confusing sometimes as to which one in which scenario. To be more reasonable in choice-making, I started from pointers, walked through their natures, and summarized some rules in using them in Go. from unsplash, Jordan Ladikos Pointers Go has pointers. A pointer holds the memory address of a ...
What else is new in C# 5?
The big new feature in C# 5 is asynchronous programming support, which I wrote about last week. However, the C# folks have also slipped in a couple of smaller features and I thought I’d round things out by mentioning those. Method caller information There’s a complete style guide to be written on Writing Enterprisey Code, but one of my favourite “enterprisey†tells, after the use of Visual Basic, is obsessively logging every function you pass through: Function Ad...
C# 5,New feature,Analysis 2012-03-20 07:45:11
Run executable jar on double click on Windows
Normally after installing Java, there will be an association between .jar and the javaw.exe. This enables the executable jar to be opened on double click. You can check the association by going to Control Panel -> Programs -> Default Programs -> Associate a file type or protocol with a program. The default program of a file type can be changed in this dialog. However sometimes there are cases where the file association for .jar may be altered after a third party application instal...
JAVA,WINDOWS,JAR,EXECUTABLE JAR 2016-05-12 03:05:04
JavaScript Needs Blocks
While reading Hacker News posts about JavaScript, I often come across the misconception that Ruby’s blocks are essentially equivalent to JavaScript’s “first class functionsâ€. Because the ability to pass functions around, especially when you can create them anonymously, is extremely powerful, the fact that both JavaScript and Ruby have a mechanism to do so makes it natural to assume equivalence. In fact, when people talk about why Ruby’s blocks are different ...
JavaScript,Block,Style,Format,Maintainebility 2012-01-11 11:59:35
A simple way to remove the small arrow on on desktop application shortcut
Maybe many of us will see a small arrow on desktop application shortcut after we install the application on Windows. Some may like it but some people may think it doesn't look beautiful enough. We may need to remove these small arrows somehow the desktop can be clean. So how? Many people may use a third party software to remove the small arrows, then they must go to download the software and install them. But do we necessary do this in order to remove the small arrow?The answer is no. Here I ...
Small Arrow,Shortcut,Desktop,Application,Windows 2014-10-25 08:39:58
Android socket programming example
Socket is a kind of interface for different sides t communicate, it usually identified by an IP and a port. There are many server side software on a server and they would provide different service. Each server many create some sockets and bind them to some ports so that clients can listen to. Software on the Internet will exchange data though a bidirectional connection established. Each end of the connection has a socket created. In Java, Socket and ServerSocket are in java.net package, ServerSo...
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