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For the past few years, I've been working on a team that does .NET and SQL Server. I'll soon be joining a team that is Java and Oracle. What can I read/do to get up-to-speed.
Start here: http://java.sun.com/javase/6/docs/
Sun's documentation is pretty good.
See also:
Hidden Features of Java
Best Java Book you have Read So Far
Overriding Equals and Hashcode in Java
What is the Most Freequent Concurrency Problem You've Encountered in Java
Javapassion is a site that offers free courses on Java. If you are on a hurry, there are 1 to 5 days courses available. You should have no problem following it, if you have experience in Java.
There are many good books for Java, but Thinking in Java is free and is good both for getting started and using as a reference.
If you need conversion of things from one language to the other here is a great website:
http://www.25hoursaday.com/CsharpVsJava.html
This, similar, SO Thread might be helpful.
Josh Bloch's Effective Java is a fantastic book. If you want to learn modern Java idioms there are few better places to look at.
Be prepared to do a lot of reading. C# (assuming this was the language you have been using)is generally regarded as an improved Java, so the Java basics will not be hard to grasp. Java development tools are generally not as tightly integrated as the Microsoft stack, thus allowing for choices to be made. Lots of discussions in Javaland revolve around choosing tools.
Get to know something about the way Java packages things (jar, war, ear).
Learn about the classpath (an endless source of joy and grief).
Build a mental picture of how things work at compile time and run time (generics and type erasure, for instance).
Visit the JavaRanch (http://www.javaranch.com/) and test your Java knowledge with the Rules Roundup! Think of it as a certification mock exam, but with cows. ("No cows were harmed in the making of Rules Roundup.")
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I have a question for you concerning Java. I am basically a Java user and did most of my work with it. However, in the machine learning classes I took in college, we used mostly python with the scikit-learn and numpy packages.
Now I want to do a project where I crawl data from the web, store it in SQL databases, and then do machine learning on this data. Maybe some of you have experience with those things and share some of it? I mean, of course it is possible to do these things with java, but maybe you have had some particular experiences on why I should use something else or what to consider?
I am happy for all your thoughts :-)
Have a great weekend!
It turns out that programming language and database implementation are secondary problems. Think first about the machine learning you want to do. Review the existing packages (in any language) and pick one according to how well it fits the needs of the business problem you are trying to solve. Then work with whatever language is most convenient for that package. You will probably find that no single language is suitable for all parts of the problem; you will end up gluing together Java, Python, R, shell scripts, etc, to make a complete solution, and there's nothing wrong with that. Consider that your job is problem solving instead of programming in a specific language and go from there.
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I have a legacy ISO prolog application of medium size that I would like to move to a JVM based language. The application is a command line tool that parses text files, does some evaluation/transformations and then export a text based file.
My team develops mainly in Java so we have a lot of existing java competence and reusable components. Prolog competence is however very low.
I don't expect there to be a tool that takes prolog source code and transform it to some other language. But I'm trying to understand what would be the easiest solution. Starting from scratch in Java or using a more functional language like Clojure?
But I'm trying to understand what would be the easiest solution.
Some implementations of Prolog run on the JVM platform. Wikipedia lists 5 of them here: http://en.wikipedia.org/wiki/Comparison_of_Prolog_implementations. So maybe the easiest solution is train someone in your team in Prolog, and just port the application to a JVM Prolog implementation. (Which might be a simple thing ...)
Someone on your team is likely to need Prolog skills anyway to successfully translate Prolog to some other language.
However, I recognize that there could be other reasons to translate; e.g. if the existing Prolog code needs a major overhaul anyway.
That is mainly depending on your team's skill. You mentioned that your team has a pretty good Java skills; why not starting with that?
If they don't know LISP, they will spent a lot of time learning it from the scratch. Learning LISP is quite an investment but it is definitely pays in the end.
Although Clojure is going to help you a lot in your case (because of data flow and data transformation), I would say that Java is a better bet since your team is competent with it.
You could consider using Clojure together with core.logic (tutorial) which is a miniKanren implementation. You would need some logic/functional programming skills but you could stay on the JVM.
Prolog is so different from java and other Object Oriented Language. I studied this language to see an other way of programming.
But I dont think there is a magic solution to convert prolog app to a java app. The logic is not the same and no other language is like Prolog. I think you will have to analyse what your prolog app does exactly and go from scractch with a new java app.
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I have been coding in java for a while now .... i want to continue in java and improve my coding abilities. I want some suggestions on -
any websites, blogs, to keep track of latest happenings in java like new coding techniques, standards, new java features, new APIs, basically anything new about java ..... (just for example sake Androidpolice keeps track all that is happening in android)
I have used a couple of classes from google guava libraries. are there any other such libraries which are helpful ?
Any suggestions are appreciated. Just wanna improve my java knowledge
Thanks
I will suggest you to participate actively in Stack Overflow. I improved a lot after joining SO. Better do lot of practice rather than reading. Create problems on your own and try to solve them. Practice makes man perfect.
I cannot recommend enough the Effective Java book by Joshua Bloch. The second (and most recent) edition assumes JSE6 hence recent (JSE7) features are not covered. But the content is impressive and certainly the kind of book I recommend developers who have moved beyond the basics.
As sans481 told, you have to practices.
Try to create different application in Java.
& If error occurs StackOverflow is here to solve your problem.
First clear funda of Java if you are not aware with it then try it.
Good Luck....
Try out some of the TopCoder challenges. They may not improve your knowledge of the API but they will make you a better programmer and thinker, and you can use Java as an implementation language.
Java Magazine is published on a bi-monthly basis in digital and mobile formats. It includes:
Profiles of innovative Java applications
Java technical how-to’s: Enterprise Java, New to Java, Rich Client, Polyglot Programming, and more
Java community news: Java User Groups, JCP standards, and more
Information about new Java books and conferences and events
Similar to TopCoder, there is also CodeChef, Project Euler and SPOJ which will help you with algorithms and make you a better programmer; not to mention helping you learn to write working Java code quickly. It won't help you write large programs, or learn object oriented stuff, but I still think it helps.
Warning, CodeChef may make you want to learn C++ because it's much more popular for online coding competitions (due to speed and memory differences).
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Which is your top 3 open-source APIs (in Java) you recommend as an example of well-designed piece of art?
That would be code that you had pleasure to browse through and got some insights from it.
Any problem domain acceptable.
Emphasis here is on educational/study quality of code, complexity level - intermediate to top.
Thanks a lot for responses.
I think that google collections is a great place to start. Josh Bloch advised the development of a lot of it, and it's a very well done API. While Spring is great, it's a little hard to know where to start. A good introduction to google collections is "coding in the small with google collections" (I can't post the actual link because of stackoverflow spam filter).
1.Spring
2.Hibernate
Spring - it's a very well written and designed framework. It's a hell of a big bit of software but if want an example of how to build in a modular manner you can't go to fair wrong looking at the spring code base
The sources of the java libraries are well documented.
In my experience the most valuable works include the documentation of desgin decisions, if you see a nice API it would be very interessting what could be the alternatives to that. Unfortunatly this is mostly burried mailing-lists of a project.
Not an external library - but the java.util.concurrent package is very nicely written. The code isn't simple, but it's very well thought out and, in my opinion, has been written brilliantly.
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I have quite a lot of C++ legacy code modules from my colleagues, unfortunately poorly written. Each is doing a different job, but they are all GNU C++ code running under Linux.
I want to write a controller program, to make a singular C++ module for a workflow, for a very urgent demo. Also I need to write a front-end web-app allowing clients submitting jobs to the controller.
My main criteria are:
development speed (very urgent demo)
good binding with C++ (I have legacy code I do not want to rewrite in another language)
smooth introduction of new programming language to team (has some python, java and perl knowledge)
What programming language fits my needs best, and why?
Details:
I lean towards python for its perfect binding with C++, as writing JNI is too much work, and kind of obsolete nowadays. However, no one in my team is Python programmer; I do know some Python (no experience in server side programming at all). I have been developing Java EE apps last year, but I do not think JNI is a good solution. Only one team member knows some Perl, others are pure C++ programmers.
Noting the "very urgent demo" part, assuming that that would take about a month, depending on the complexity, I'd stick to the familiar.
True, maintaining python would be easier in the end, and learning python should be a breeze, if you deem it viable.
I'd say, have the team learn python and do the basic stuff, as you learn the deeper parts, you could build classes for them to extend/implement. That way, you get things done as they learn.
Given the urgency, I'd have to stick with C++.
Without that, I'd say keep what you got, but feel free to switch to a preferred language when refactoring. That would be the time to do it.
What you should not do, ever, is "port" anything to another language without rewriting or changing functionality in any way. It is a total waste of time, when the "best" outcome you can hope for is that it has no new bugs when you are done.
I would use Python. You could write very basic wrappers using the Python C API and then call said functions from Python with relative ease.