Blogs by topic: J2SE
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Community
Know how persist document in the Cassandra in a way fairly simple
Eclipse is famous IDE in em Java, follows the open source model. The Eclipse project was stated by IBM that does the first version, then donated like open source for the community. The begin costs was above 40 millions. Nowadays, the Eclipse is one of the most used worldwide. Has important feature how the SWT uses and not the Swing, there are too many plug-ins...
Education
This article has the main objective show a little example for persist information in Cassandra using java.
For demonstrated the persistence with Cassandra will used the Easy-Cassandra, a framework open source for use this SGBG in an easy mode.
@ColumnFamilyValue(nome = "person")//
public class Person implements...
Many things changed from java 1 in 1995 at java 7 2012. Learn about this reading this article.
A preview of the pure Java version of VisualLangLab is now available. The GUI, and other characteristics, are virtually identical to the previous version, but the JAR file is very much smaller as it does not bundle the Scala API jars.
In 1996, a group that I was working with devised a development process which we called Defect Driven Design, otherwise known as D3 (D-Cubed). We were a bit disappointed by not surprised that D3 never really caught on but just recently I saw a glimmer of hope for a revival.
Programming
I mentioned the idea to use Wordle as an execution profiler while presenting the profiling section of my performance tuning course in Paris last December. The idea was seeded by presentation that Neal Ford did a few years ago in which he used Wordle to expose the vocabulary of a Java application. Instead of vocabulary, I wanted to see if Wordle could be used to visualize an applications dominate behavior.
A couple of weeks ago, I sent out a little quiz to my readers of The Java Specialists' Newsletter. No one managed to figure out what the code does without running it. Some managed to explain the result once they had run it. Perfect quiz for weeding out those job applicants you don't like. Especially if you are working in the banking industry. OK, enough hints, let's look at the quiz :-)
A new tutorial exercises VisualLangLab using all the examples and techniques in Chapter-3 "A Quick Tour for the Impatient" of the book "The Definitive ANTLR Reference". A new "WildCard" pseudo-token that matches any other defined token has been added to facilitate recovery from grammar errors in the input. Read about the various other improvements that make VisualLangLab even more user-friendly.
This blog describes how to build both, a 64-bit and a 32-bit version of OpenJDK 8 on a plain, vanilla WindowsXP 64-bit operating system using only free (as in free beer) tools.
body {
font-family: arial, helvetica, sans-serif;
font-size: 10pt;
}
caption.my {
font-weight: bold;
margin: 0px 0px 10px 0px;
}
span.update {
font-weight: bold;
color: maroon...
J2SE
There appears to be over-reacting and fearism concerning a recent decision to cancel the DLJ project, and subsequently Ubuntu's plan to remove DLJ-based Java packages from their repository. I'm totally out of the loop of this except for a couple things. As the former DLJ Project Lead I was still vaguely involved with the management of that project, and recently there was an...
One of the old bits of tuning advice given when Java memory management was not as tall as it it today was to set max heap to min heap. After all, we don't really want the JVM messing around with memory when it should really be getting on with things. Fast forward a few years and the adaptive memory management picture has matured considerably.
How to create a kind of volatile final field i.e. a static field that will be considered as a constant by the VM but that can be updated as well using JSR 292 API.
Just wrapped up my last performance tuning course for this year and for the second time running, some members of my Parisian group had the opportunity to run the exercises on virtualized hardware. The results were interestingly horrible
Recently I came across an interesting class loading behavior. Look at the test below...
Was added to his package to facilitate applications which needs scalable processes.
A feature is atomic variable. Variable atomic means that it cannot be divided - it's like the S.O. with any resource (Driver CD, USB) cannot be divided but needs be used in many processes.
static class AtomicCounter...
The java.util.concurrent library added a little gem of a class, TimeUnit, which is well worth knowing a bit about.
It’s after JavaONE and as promised, here is the answer to the performance puzzler with a stack trace.
GUI
In my last blog I’ve introduced JavaFX 2.0 beta, describing an initial port of JavaFX Balls, also in beta stage at that time. Now I finally finish JavaFX Balls 3.
Look ma, no design!
I don’t pretend to be a designer, and the consequence is that when I make a mashup of animation, video and web, that’s the result. Get the source code here.
I’ve added new layers of content...
Welcome java 7 part 3 -NIO 2 JSR 203
So like the coin project, in the NIO 2 there aren't unprecedented features in this e -specification, but now it's possible do some easier work I/Os in java. With the class java.io.Files are possible to perform several operations in simple mode. For that it needs and uses the java.io.file.Path, this interface represents files and...
