Introduction to object-oriented programming concepts: class, objects, polymorphism, abstraction, inheritance.
In this article you will learn how compile Java sources on runtime using the JSR 199 API.
A synopsis of blog posts, videos, talks, presentations on topics like Performance tuning, JVM, GC in Java, Mechanical Sympathy, et al by experts from the industry.
I'll be covering three reviews of talks by Attila Szegedi (1 talk) and Ben Evans (2 talks). They speak on the subject of Java Performance and the GC. The first talk by Attila covers a lot of his experience as an Engineer at Twitter - so its lots of information out of live experience in the field on production systems. Making use of thin objects instead of fat ones is one of the buzzwords in his talk.
Ben in his two talks covers Performance, JVM and GC in great depth. He points out about people's misconception about Performance, the JVM and GC, things that people don't have certain run-time flags enabled in production. How the underlying machinery works, why it works the way it works?How efficient the machinery is and what best to do and not to do to get good throughput out of it?
At 2014/01/11, A big Java EE 7 event has been held on China Nanjing Software Valley jointly organized by China (Nanjing) Software Valley Joint Management Committee and China Nanjing Java User Group.
Interfaces serve a very useful tool that help improve the overall design of your code by providing the ability to upcast to more than one base type, and to more effectively encapsulate implementation..
When you create a class in Java, you implicitly inherit the fields and methods of the root Object class even when you do not explicitly inherit from some other class. This ability allows you to substitute an object for its base class and is proof of the saying - "in Java everything is an object".
One of the most compelling features about an OOP language like Java is that it provides a way to reuse code to add functionality within the classes you create. Essentially, when writing code in Java, seldom are you required to begin from scratch because the Java library comes with a great many classes that make it easy for you to attain a minimum level of functionality with relative ease.
A key consideration for the library designer in the normal conduct of operations is maintaining the ability to make changes or improvements to the library at any time without requiring the consumers (client programmers) of that library to do the same. In Java, a library consists of a logical grouping of .class files packaged together to make a working program.
Hadoop is an outstanding parallel computing system whose default parallel computing mode is MapReduce. However, such parallel computing is not specially designed for parallel data computing. Plus, it is not an agile parallel computing program language, the coding efficiency for data computing is relatively low, and this parallel computing is even more difficult to compose the universal algorithm...
PDF and Video preview for Magnolia 5 Digital asset management
Don't ask what open source can do for you. Ask what you can contribute to open source. Adopt a zombie project and get it back to life!
Every once in a while I run into someone that has a JVM that is running back to back collections and yet the heap is still almost full after each attempt! When they discover that their problem is related to the JVM not having enough memory they often ask the question, why didn't the JVM throw an OutOfMemoryError?
In memory computation in Hadoop will great enhance data processing speed and volume.
An example to illustrate hadoop code reuse
Parallel computing in hadoop with esProc instead of MapReduce
Groovy Weather: POGOs, Gson, and Open Weather" by Ken Kousen of Making Java Groovy is 45% off with promotional code kousenjn at manning.com.
Just recently I was engaged to assist with an application that wasn’t behaving. The application, running in a 1.7.0_45 JVM, relied heavily on a 3rd party SAAS framework. That vendor provided my client with a list of 26 different JVM flags that should be set. When faced with this long list of flags I couldn’t resist asking why all the flags and why these flags. After all there are more than 700 product flags defined in the JVM and to be honest, I’ve only a vague idea of the effect may have on a runtime.
A method to avoid database extension
I was very pleased to see the JFrog team take me up on my suggestion early this year that "Maybe the JFrog team will consider giving a presentation on how they put all this together at JavaOne this September". Unfortunately for me, the session ("Building a Massively Scalable Cloud Service from the Ground Up") was already filled to capacity as I walked up to the door...
Looking back on a relatively long period of time always makes me nostalgic. I can’t help but turn into a wistful old man, preaching the value of the “good old times”. In Magnolia’s case, fortunately, this is slightly different - there are plenty of things that are still great, and on an even more positive note - they are constantly getting better!
However, I’d still love give in to my penchant...