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  Finding selected checkbox items in a JSF dataTable

This is one of those problems that I couldn’t find a complete example for when I needed it, so hopefully this will save somebody else the extra time it took me to piece it together. We frequently need to have data tables in our UI, and allow the user to select a subset of those items for action. In JavaServer Faces, this means having a DataTable, each row having its own checkbox. But when the action is triggered, how to we find which items the user has selected. The first step is to ...

   JavaServer Faces,JSF,Datatable,Checkbox,Example     2012-01-03 03:02:46

  JShell -- The command line tool to run Java code in Java 9

Java 9 is currently a work-in-progress and is planned to be GAed in March 2017. Quite a few new features will be introduced in the new release. The coolest feature is project Jigsaw which is to modularize the Java packages so that a customized JDK can be built and shipped with only the necessary modules to fulfill their project requirement. Apart from this feature, another big new feature is project Kulla -- JShell. In simple, JShell is a command line tool which can be used to run...

   JAVA 9,JSHELL,KULLA     2016-04-01 21:46:48

  Why accessing Java HashMap may cause infinite loop in concurrent environment

HashMap in Java is frequently used to handle key/value pairs. But it is not a good candidate to be used in concurrent environment where ConcurrentHashMap should be used instead. If used in concurrent environment, it may cause lots of unexpected behavior even including make the program getting into an infinite loop situation. To understand how this can happen, let's first discuss how HaspMap works internally. In this post we will use implementation of HashMap before Java 8 as example, Java 8 prov...

   JAVA,HASHMAP,INFINITE LOOP     2020-03-29 01:47:00

  Python Patterns - An Optimization Anecdote

The other day, a friend asked me a seemingly simple question: what's the best way to convert a list of integers into a string, presuming that the integers are ASCII values. For instance, the list [97, 98, 99] should be converted to the string 'abc'. Let's assume we want to write a function to do this. The first version I came up with was totally straightforward: def f1(list): string = "" for item in list: string = string + chr(item) return string ...

   Python,Optimization,Anecdote,Loopup,ASCII     2011-12-18 10:52:49

  Social networks are becoming your personal operating system

Today’s biggest trends — the mobile web, social media, gamification, real-time — are changing the landscape for business. Consumers are connecting with one another, and in the process they’re becoming increasingly empowered and influential.How these connected consumers discover, share, and communicate is different than the way they used to. This change requires businesses to rethink their approach. Organizations need to examine the impact of technology on consumer beh...

   Facebook,Operating System,Social network,Feature,Facebook me     2011-10-28 10:02:55

  Package Control doesn't show up in Sublime Text 3

Package Control is a package management console for managing packages in Sublime Text. It is frequently used to install, update packages. In Sublime Text 3, the Package Control package can be installed by following instructions at https://packagecontrol.io/installation After installation, when you press Ctrl + Shift + P, a dialog with a text field will show up and package control commands can be typed and executed.  However, if you don't see the expected package control commands ...

   SUBLIME TEXT 3,SUBLIME TEXT,PACKAGE CONTROL     2016-09-25 09:35:07

  Why are column oriented databases so much faster than row oriented databases?

I have been playing around with Hybrid Word Aligned Bitmaps for a few weeks now, and they turn out to be a rather remarkable data structure.  I believe that they are utilized extensively in modern column oriented databases such as Vertica and MonetDB. Essentially HWABs are a data structure that allows you to represent a sparse bitmap (series of 0's and 1's) really efficiently in memory.  The key trick here is the use of run length encoding to compress the bitmap into fe...

   Database,Column oriented,Speed analysis,Vertica     2012-01-29 04:27:05

  Get the 48×48 or 256×256 icon of a file on Windows

Getting the 16×16 and 32×32 icons on Windows is relatively easy and is often as simple as one call to ExtractIconEx. However, getting the extra large (48×48) and jumbo (256×256) icons introduced respectively by XP and Vista is slighly more complex. This is normally done by: Getting the file information, in particular the icon index, for the given file using SHGetFileInfoRetrieving the system image list where all the icons are storedCasting the image list to an IImageList interf...

   File icon,File extension,Association,Large icon,Windows     2012-03-23 09:35:17

  STOP WRITING GOOD CODE; START WRITING GOOD SOFTWARE

Good software trumps elaborate code. And unfortunately, you can’t usually have both. The real world has deadlines and ship dates. It’s a game of pick two:Ship on timeShip with elaborate codeShip with a fantastic productAlmost always, you should pick the first and the last when you’re building software applications for users (if you’re building API’s or open source libraries for other developers, then it’s a different story). Too often I have seen de...

   Good software,Standard,Good code,Deadline,Tradeoff     2011-11-20 06:56:06

  Where do software engineers get highest pay?

According to Tencent Tech, Tech companies are generous to engineers is not a secret because there is a lack of excellent engineers. These companies are willing to pay high salary and provide attractive welfare to attract these talented people. Recently, a list of companies which pay highest average salary to software engineers is published. The interesting thing is Apple, Google or Facebook is not the company which pays highest. Then which one? The answer is Juniper. The average salary in Junipe...

   Software engineer,Salary,Juniper     2013-04-12 21:06:52

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