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SEARCH KEYWORD -- Synchronization



  Difference between ConcurrentHashMap and Hashtable


Both ConcurrentHashMap and Hashtable are Collection classes for storing key value pairs and they both provide fast element search with a supplied key. They have much in common. However, we will not discuss the similarities between them here, instead we will focus on the differences between them. ConcurrentHashMap and Hashtable are both thread safe. But the mechanism for thread safe is different between them. Hashtable is synchronized, it utilizes the synchronization mechanism; while ConcurrentHa...

   ConcurrentHashMap,Hashtable     2013-11-18 08:06:54


  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


  Samsung will build its own mobile browser


According to the Korean IT News, Samsung is developing its own brand mobile browser based on WebKit, make its the default browser for future Gaxlaxy products.Samsung has posted recruitment advertisements for recruiting Webkit developers in its Advanced Software Platform Lab located in the Silicon Valley. Webkit is an open-source browser engine, Apple's Safari and Google's Chrome are based on this open source engine.For many users, the phone's built-in default browser is still the most used, so S...

   Samsung,Browser,Webkit     2012-09-24 22:32:00


  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...

   Linux,Clock,UTC     2013-03-21 12:19:30


  Amazon unveils 8.9" Kindle Fire HD


Amazon today unveiled 7 products of Kindle family, including the $69 new Kindle; Kindle Paperwhite WiFi/3G, priced at $119 / $179; 7-inch Kindle Fire regular edition/HD version, $159/$ 199; 8.9inch Kindle Fire HD with WiFi/4G Edition at $299 /$499. However, the Amazon phone did not show up. The 8.9-inch Kindle Fire HD is today's highlight, because it looks real similar to iPad. Kindle Fire HD has the following features: 1920 x 1200 resolution, 254PPI Texas Instruments OMAP 4470 proce...

   Amazon,Kindle Fire HD,tablet     2012-09-06 19:12:05


  Multithreading interview questions in Java


Multithreading as a widespread programming and execution model allows multiple threads to exist within the context of a single process. These threads share the process' resources but are able to execute independently. The threaded programming model provides developers with a useful abstraction of concurrent execution. However, perhaps the most interesting application of the technology is when it is applied to a single process to enable parallel execution on a multiprocessor system.Many programme...

   Multithreading,Java,Interview     2012-05-28 06:33:25


  Use Java ThreadLocal with caution


According to Oracle documentation, ThreadLocal is a class provides thread-local variables. These variables differ from their normal counterparts in that each thread that accesses one (via its get or set method) has its own, independently initialized copy of the variable. ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread. In short, ThreadLocal variables are variables belong to a thread, not a class or an instance of a class. One common...

   JAVA,MEMORY LEAK, THREADLOCAL     2015-11-03 07:31:57


  Google launches Google Keep


According to Tencent Tech, Google announced the launch of Google Keep on Wednesday This is a note application similar to Evernote, its philosophy is to help you save everything you want to remember, including text and images and other notes, they can be instantly synchronized among different devices so that users can get the information they want at any time. This is a free service, it provides support for Web and Android 4.0 or later devices, users can navigate to Drive.Google.com/Keep or downl...

   Google Keep,Evernote,Synchronization     2013-03-21 13:00:02


  Show Bootstrap tooltip in AngularJS ng-repeat elements


In contemporary web application development, many front-end frameworks have been used to accelerate the speed of development and circumvent browser compatibility issues. Among them, AngularJS and Bootstrap are two frequently used.  AngularJS is a MVC JavaScript framework developed by Google to provide easy synchronization between user view and data model. While Bootstrap is developed by Twitter and it eases the work of designing a simple and concise UI without much manual design work ...

   BOOTSTRAP,ANGULARJS,TOOLTIP,NG-REPEAT     2016-05-21 10:52:02


  10 Points about Java heap memory


When I started java programming I didn't know what is java heap or what is heap space in Java, I was even not aware of where does object in Java gets created, it’s when I started doing professional programming I came across error java.lang.outofmemoryerror then I realized What is Heap in Java or Java Heap Space. Its happens with most of programmer because learning language is easy but learning basics is difficult since there is no formal process which can teach you every basics of programm...

   Java,Heap memory,Tips     2012-02-20 05:38:06