Can I develop for Greenfoot using Intellij Idea? - java

I'm taking a Java course where I have to do some development for Greenfoot. I'm very accustomed to using vim for development in C / C++ and so have been using Intellij Idea with a vim plugin.
I despise the Greenfoot IDE.
Is it possible to use Intellij to develop for Greenfoot?

As you've found already you can add libraries and mess around to get some bits working, but it's not officially supported (so might change from release to release or break) and most likely never will be. It's more by accident than design that it works at all this way.
I've often wanted to use a professional IDE for doing Greenfoot work myself, but the simple answer is that Greenfoot is primarily focused for beginners, for a fun and interactive way of teaching Java to people who have never programmed previously. The developers could potentially focus their time in providing official support for coding in other IDE's, but the amount of work required means it's pretty much been decided it's not worth doing.
If you haven't noticed already, Greenfoot 2 is now out with a much improved editor that supports basic code completion and intelli-sense. It's still of course nowhere near the IntelliJ editor, nor will it ever be, but it certainly makes developing in it more tolerable if you're used to something more advanced.

I use IntelliJ and I do not think it would be supported, but I am not certain.
This site has a similar question

I was able to go into the Project Structure, dependencies tab, select add module library and do attach classes selecting the /lib/greenfoot/standalone directory. This allows me to compile the balloons scenario cleanly. However, to actually run the scenario's you still have to use the Greenfoot environment due to all the games it plays behind the scenes.

This link is about Greenfoot in Eclipse, but the steps also seem to work with IntelliJ.
Basically you add bluejcore.jar and greenfoot.jar (found in your installation directory of Greenfoot) as your project libraries and create a properties file (details in the link) for Greenfoot. Finally select GreenfootScenarioMain as main class, this allows you to launch Greenfoot programs from within IntelliJ.

Related

Emacs java-mode: malabar, jdee, or eclim?

I want to use emacs for java coding, but I'm confused on what mode to use for java coding. There's jdee, which seems ide-like; malabar, who is said to be more well versed in java 1.5 constructs than jdee; and emacs-eclim, which is an eclipse backend for emacs. There are also a wealth of completion extensions for emacs, and I'm also confused on which one to use. In fact, I'm so confused that I deferred using any of them until I get recommendations.
What is the current best option for java-mode + completion in emacs? And, if ever I decide to use a combination of what I mentioned above, will conflicts happen?
For those used to the power of Emacs text manipulation then Eclipse can seem like pedaling a bicycle with one foot. The Emacs+ plugin from http://www.mulgasoft.com/ is excellent for getting Emacs key bindings into Eclipse.
I use both Eclipse and Emacs a lot, but if I only did Java development I might use only Eclipse with Emacs+. It takes some work to get many Eclipse features enabled on Emacs.
My advice is to use Emacs >= 23. If you are on a Mac, look at AquaMacs. I use JDEE as the Java plugin. This has the serious drawback of not playing well with generics. It's not that it stops working, it's just that a lot of stuff isn't recognized. Do not use the old 2.3.5 JDEE plugin (that comes with most Linux distributions), but get the 2.4 version from the sourceforge site. Also get the Emacs Code Browser (ECB); this is a plugin that will give you stuff like Eclipse's Project Explorer and Outline views (other developers will look at this and not believe you when tell them that it's Emacs). I've used this setup for commercial projects on Windows, Mac, and Linux in the past year.
In fact, Eclipse plays pretty well with Emacs and I often switch between the two. Eclipse has some nice refactoring tools that I used to use sed for, and it has a good debugger interface. You can use them simultaneously. I find that I use Eclipse when working with other people's code and Emacs when I am writing my own code---Emacs is that much faster. Note that for me, a lot of the value of Emacs is the non-Java functionality, like editing Tomcat configuration files on remote servers from my local Emacs, writing professional documents with LaTeX, developing in Python or Bash or MATLAB or XML, and the odd text manipulation task (e.g., converting CVS files into String[] arrays).
I haven't used the other two projects you mention. It is possible to use the Eclipse compiler with Emacs already, so I'm not sure I see the point of the emacs-eclim project, which seems to be moribund anyway. The Malabar project might be interesting, but seems to be the product of one somewhat cranky developer (e.g., the warning "if you're not using Maven (why?) you should not consider malabar-mode"---I'll tell my clients that?).
Java on Emacs is in a sad state. I wish for JDEE to be revitalized, but it's not clear when or if that will happen. The web site and mailing list offer few clues.
I use emacs-eclim with auto-complete-mode support and java-mode highlighting exclusively for Java programming. 90% of my work is done in emacs, but I switch to eclipse when I need to debug, run unit tests or do major refactorings. All in all, this setup works very well for me.
I haven't tried JDEE for years, but I remember it was a b*tch to set up. I didn't care for the UI very much, as it put up lots of prearranged windows that were locked in place. I like to be able to switch back and forth between editing buffers, often showing just one window, but splitting and rearranging on the fly when it becomes necessary.
Note: I am an emacs-eclim maintainer, and this has probably coloured my judgement.
If you're using Maven, then I'd recommend malabar-mode. It will set everything up for you automagically, no need for editing project files like you'd have to do with JDEE. The downside I've found with malabar, is that it can consume a lot of memory if you've got a lot of multi level module projects open.
Both Malabar and JDEE will give you "true" completion, i.e. only completions that are possible. However, there are two amazing "intelligent guessing completion frameworks" in Emacs. hippie-expand and auto-complete.
The former is great (can complete whole code blocks for you, making it possible to e.g. cycle through all if-tests in your projects), but auto-complete mode is even better. It'll give you a nice intelli sense style menu, will "learn" as you use it, and allows you to define a file with the completions you'd like to be available in the various languages.

What is the best approach to port an Android application to Windows?

I used Eclipse with the Android SDK to develop the original application. I ask since this was my first Java (and Eclipse, and Android, and XML) project. I assume that most of the Java should run on the PC without too much trouble. I may want to restructure the code to isolate the Android specific functions. Should I stay with Eclipse or move to something like NetBeans? Any advice would be terrific.
Eclipse vs Netbeans is irrelevant to your problem. They are both just glorified text editors that let you edit java code, with a little bit of compilation help. You can write any java app in either, its really just personal preference.
The ease of porting to windows really depends on what your application is. If you have a large chunk of code that is not dependent on any of the UI or lifecycle stuff, then you should be able to create a separate java library for that and reference it in both your android app, and your windows app.
The challange will be replacing the UI. As Fredley mentioned, swing is the built in option. Its a bit of a pain, but you should be able to find plenty of documentation on it.
If your application is tightly tied to the UI, then you are going to have a very hard time finding any code in common.
Assuming that most of your code is in Android-independant classes, your biggest hurdle will be the GUI. Investigate swing to start off with.
The choice between NetBeans and Eclipse is largely one of preference. NetBeans has some nice GUI tools- but so does Eclipse. In my opinion, it's usually best to stay with what you know.
Here's a decent post on the subject of Java IDEs: What is the best free IDE for Java Programming

What are some good plugins for developing Java in VIM?

I love vim, but not having things like IntelliSense/Code completion from Eclipse makes it pretty difficult. I know, I know, I should be able to look at method signatures and java docs for the API I am interested in using. I'd love to, but I'd like it to be accessible from my fingertips instead of having to browse the source tree manually or have a JDK reference handy.
What plugins would make this easier?
I tried eclim for a while. It was pretty good, basically it uses eclipse in the background as a kind of engine and provides a plugin to let you use all of eclipses goodness through vim.
http://eclim.org/
Don't write Java in Vim — put Vim inside a Java IDE:
IdeaVIM for IntelliJ
viPlugin or Eclim for Eclipse
jVi or ViEx for NetBeans
I love Vim, but using an IDE for Java is the only way to stay sane. A decent Java IDE will:
Show invalid syntax or type errors
Show missing JavaDoc
Manage import statements for you
Highlight unused methods and variables
Safely perform powerful refactorings such as moving methods or renaming classes -- (no, search and replace doesn't cut it, I promise)
Reformat your code automatically or on-demand
Vim can't do the above, but you can use all the Vim keybindings in a program which does.
I use Eclipse + Vrapper. Enables the vi dual mode editing we all know and love. <ESC>
Completely free and lightweight. The goal is to have the comfort and ease which comes with the different modes, complex commands and count/operator/motion combinations which are the key features behind editing with Vim, while preserving the powerful features of the different Eclipse text editors, like code generation and refactoring.
While eclim is another alternative, I feel eclim takes over Eclipse and vrapper doesn't.
Check out the JDE plugin for Vim. It provides Java omni-completion and a documentation viewer (among other things).
I use the javacomplete.vim plugin for omni-completion for java. It's a very nice script: it also shows the method signatures on top of the omni-completion. The downside is that it is a bit slow, but it has worked fine for me otherwise. Eclim might be better ut I haven't tried it yet so I can't comment on it.
I've also used the jcommenter.vim plugin for generating javadoc comments. It can parse method signatures and automatically add the relevant #param foo fields and such.
For the API searching I would suggest on overriding the K key on normal mode. It searches man pages for the keyword under the cursor, but the behavior can be overriden by setting the keywordprg variable. See this thread for an example.
Other scripts which I've found very useful (not specific to Java development): NERDCommenter, AutoClose, snipMate, Align.
There's an IntelliJ VIM plugin as well. Plus, IntelliJ is released an open-source, free version.
Vim is not an IDE replacement. But very specific additional tool. With Vim you should only do small-fast tweaks while the main development is going under Netbeans/Eclipse/IDEA.
One more time. It is a Bad Bad Bad idea to turn Vim into Full IDE. Why? It won't be so fast. And thus won't be so pretty.
Here is scenario. You have opened Eclipse or whatever to edit your current task. And in 10 minutes you have to switch to another Task which is kind of urgent. The task is to tweak a little a maven or an ant built script and/or some deployment perl/python/groovy scripts.
How much time will it take to reload Eclipse to work on a new 5 minutes task and switch back?
But if you are Vim guru you can handle this in seconds. You can change one file and run Ant/Mvn within Vim.
And this is the power of Vim. You can change and check one file in no time no matter which extension it has: java, groovy, c++, makefile, bash, c#, etc.
This will be an uphill battle. There is so much knowledge about your program built into Eclipse, that I expect you will eventually have to reimplement it all to be happy.
Any particular reason you cannot just decide you like the built-in editor in Eclipse?

Is Eclipse the best IDE for Java? [closed]

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Is Eclipse the best IDE for Java?
If not, is there something better?
I want to know and possibly try it out. Thanks.
Let me just start out by saying that Eclipse is a fantastic IDE for Java and many other languages. Its plugin architecture and its extensibility are hard to rival and the fact that it's free is a huge plus for smaller teams or tight budgets.
A few things that I hate about Eclipse.
The documentation is really lacking. I don't know who writes the stuff, but if it's not just flatly missing, it's incomplete. If it's not incomplete, then it's just flat out wrong. I have wasted many precious hours trying to use a given feature in Eclipse by walking through its documentation only to discover that it was all trash to begin with.
Despite the size of the project, I have found the community to be very lacking and/or confusing enough to be hard to participate in. I have tried several times to get help on a particular subject or plugin only to be sent to 3 or 4 different newsgroups who all point to the other newsgroup or just plain don't respond. This can be very frustrating, as much smaller open source products that I use are really good about answering questions I have. Perhaps it's simply a function of the size of the community.
If you need functionality beyond the bundled functionality of one of their distros (for instance, the Eclipse for Java EE Developers distro which bundles things like the WTP), I have found the installation process for extra plugins excruciatingly painful. I don't know why they can't make that process simpler (or maybe I'm just spoiled on my Mac at home and don't know how bad it really is out in the 'real' world) but if I'm not just unsuccessful, oftentimes it's a process of multiple hours to get a new plugin installed. This was supposedly one of their goals in 3.4 (to make installation of new projects simpler); if they succeeded, I can't tell.
Documentation in the form of books and actual tutorials is sorely lacking. I want a master walkthrough for something as dense and feature-rich as Eclipse; something that says, 'hey, did you know about this feature and how it can really make you more productive?'. As far as I've found, nothing like that exists. If you want to figure out Eclipse, you've got one option, sit down and play with it (literally play with it, not just see a feature and go and read the documentation for it, because that probably doesn't exist or is wrong).
Despite these things, Eclipse really is a great IDE. Its refactoring tooling works tremendously well. The handling of Javadoc works perfectly. All of features we've come to expect of an IDE are their (code completion, templates, integration with various SCMSs, integration with build systems). Its code formatting and cleanup tools are very powerful. I find its build system to work well and intuitively. I think these are the things upon which its reputation is really built.
I don't have enough experience with other IDEs or with other distros of Eclipse (I've seen RAD at work quite a few times; I can't believe anyone would pay what they're charging for that) to comment on them, but I've been quite happy with Eclipse for the most part. One tip I have heard from multiple places is that if you want Eclipse without a lot of the hassle that can come with its straight install, go with a for-pay distro of it. My Eclipse is a highly recommended version that I've seen all over the net that is really very affordable (last I heard, $50 for the distro plus a year of free upgrades). If you have the budget and need the added functionality, I'd go with something like that.
Anyway, I've tried to be as detailed as I can. I hope this helps and good luck on your search! :)
IntelliJ IDEA was awsome. Now it is just "better than Eclipse". You can code in IDEA several times faster than in Eclipse in my experience (I moved from being an Eclipse early-adopter to IDEA and haven't looked back) but IDEA has a number of flaws:
Full version is not free.
It hogs memory
Project management is not great
Jetbrains keep bringing out minor
enhancements and calling them major
releases. IDEA is now slower and
buggier than it was a few years ago.
And you get charged for the
pleasure! (IDEA now has a free Community Edition)
I still wouldn't go back though; the code refactorings and intentions in IDEA are just too good.
A major version of Eclipse came out a while back and it took me about an hour of searching on the website to figure out what was actually contained in the release which might persuade me back into the fold. Visit JetBrains to see how to sell an IDE!
There is no best IDE. You make it as good as you get used using it.
Eclipse can't remotely be called an IDE to my opinion. Okay that's exaggerated, I know. It merely reflects my intense agony thanks to eclipse! Whatever you do, it just doesn't work! You always need to fight with it to make it do things the right way. During that time, you're not developing code which is what you're supposed to do, right? eclipse and maven integration: unreliable! Eclipse and ivy integration: unreliable. WTP: buggy buggy buggy! Eclipse and wstl validation: buggy! It complains about not finding URL's out of the blue even though they do exist, and a few days later, without having changed them, it suddenly does find them etc etc. I Could write a frakking book about it. To answer your question: NO ECLIPSE IS NOT EVEN CLOSE THE BEST IDE!!! IntelliJ is supposed to be MUCH better!
Eclipse was the first IDE to move me off of XEmacs. However, when my employer offered to buy me a Intellij IDEA license if I wanted one it only took 3 days with an evaluation copy to convince me to go for it.
It seems like so many small things are just nicer.
IntelliJ is good one but its not free!!Then NetBeans is also a good option.Also if you are IBM suite WSAD is good
I'd have to vote for Netbeans as the best one currently. Eclipse is decent, but right now Netbeans is better.
I used IntelliJ for almost 5+ years (from v1.5 to v7) and around 8 months ago I migrated to IBM RAD (which is built on top of old eclipse platform) and around 3 months ago I settled down with Eclipse (Ganymede).
I used IntelliJ on a mid size projects (with 10k classes) and I'm using Eclipse on one with just few hundreds of classes.
I found both of these IDEs (IntelliJ and Eclipse) to be good. IBM RAD is just a waste of money (ofcourse one could be stuck in an IBM shop without choice).
IntelliJ has far superior refactoring capabilities and keyboard shortcuts for most of the features compared to Eclipse. It supports importing projects from Eclipse. It has better built in xml handling capabilities (with refactorings applicable almost like for the java code). Built in Intelli Sense is also very good.
Eclipse is a great tool and its free. It took me around 1-2 months to get used to Eclipse from IntelliJ (lot of unlearning of shortcuts), but I got hang of Eclipse, it has been pretty smooth. I havent used Eclipse on mid size project.
Both IntelliJ and Eclipse have active plugin communities and both integrate well with version control systems, unit test frameworks, application servers and profilers.
IntelliJ started becoming slow and bloated starting from v4.0. It was slow with mid size projects. I would not use IntelliJ unless its performance can be improved.
I havent used these two IDEs for anything other than java development.
If you are a java developer and your company pays for IntelliJ and if your project is not too big, go for it. Otherwise, dont despair: Eclipse is always there.
I gave Eclipse a 3 months ride at my new work, but after that I found out that normal Maven project can be run in IntelliJ IDEA too (unless it's Eclipse plugin/EMF/something of course ;-)). 3 months are not enough to compare it with 8+ years with IDEA, but it's enough to claim I gave it a fair try. I decided to live with its perspectives (other IDEs don't need them), with its poor debugger (doesn't show date values unless you click on them! etc.), with its comparatively worse completion than IDEA has.
Now after all those years IDEA is also free (community edition) and I use it without much trouble. Of course I miss some of those "Ultimate" features of paid version, but it's far better than Eclipse. Biggest difference is the whole mindset needed for both of these IDEs. But after you master the mindset of either I can't understand what can anyone hold to Eclipse - unless you need its plugin ecosystem or you have some serious investments there.
Example of "mindset" differences: You have to save in Eclipse, not in IDEA, and I don't care what is better or worse - but you have to save in Eclipse to let him clean up underlined errors that are not errors anymore, etc. ;-) You have to save there in order to get rid of errors in other files too, because other file doesn't see the changes otherwise.
I blogged much more about this topic - and yes, I'm biased, though I tried to be as little as possible. But after some time it wasn't simply possible: :-)
http://virgo47.wordpress.com/2011/01/30/eclipse-vs-intellij-idea/
http://virgo47.wordpress.com/2011/02/22/from-intellij-idea-to-eclipse-2/
http://virgo47.wordpress.com/2011/03/24/from-intellij-idea-to-eclipse-3/
http://virgo47.wordpress.com/2011/04/10/from-intellij-idea-to-eclipse-4/
And no, not even IDEA is perfect, I know it. Because I use it a lot. But it is the best Java IDE if you ask me. Even the Community edition.
[This is not really an answer, just an anecdote. I worked with guys who used emacs heavily loaded with macros and color coded. Crazy! Why do that when there are so many good IDEs out there?]
if you know you way around emacs you can code 100x faster then an IDE. And it can handle bunch of diffrent languages so you do not need to change your coding enviroment if you need to code in another language. Works on all operating systems, you can custimize/add anything you want. Even edit files half way across the world over ssh.(no downloading or uploading).
Before calling them crazy you gotto use it first. i am sure they are calling you crazy for using an IDE :).
It is often said that there are better IDE's for various languages (eg Java) than Eclipse.
The power of Eclipse is that it's basically the same IDE for many languages, meaning that if you know you'll have to code in several programming languages (Java, C++, Python) it's a huge advantage that you only have to learn one IDE: Eclipse.
Eclipse! It can be slow at times and uses a lot of memory but it works well.
I don't know if Eclipse is THE BEST Java IDE, but it is definitely very decent and my favorite IDE. I tried IntelliJ briefly before, and found that it's pretty similar to Eclipse (IntelliJ might offer some nicer features, but Eclipse is free and open source).
I never really tried NetBean because I know Eclipse before I know NetBean.
Eclipse is my favorite because:
Free
Extensible (to a point that you can turn it in to C++ IDE or DB Development IDE)
Open source
I know how to write Eclipse plugin
You can develop a product easily with Eclipse (exp. Lime Wire is Eclipse under the hood)
If you are used to using conventional Java IDE like JCreator you might need some time to get used to Eclipse. I remember when I first learned Eclipse, I didn't know how to compile Java source...
I would suggest that in order to find the best IDE FOR YOU, try what people recommended (NetBean, Eclipse, and IntelliJ), and see which one you like the most, then stick with it and become an expert of it. Having the right IDE will boost up your productivity a lot in my opinion.
I am going to have to recommend Oracle JDeveloper. I personally thought that Eclipse was the best Java IDE too at one point. Then I was introduced to Oracle JDeveloper by my job. I find the UI design much better than Eclipse. Also it comes with an incredible amount of features built in including great support for EJB3, JSF, WebServices, etc. It is essentially an IDE for the entire JavaEE stack (and the Oracle ADF framework as well). - All of the tools you will (probably) need for JavaEE development come with this IDE right out of the box, no plugins required (unless you download the minimalist version).
Talking about java Ide it is better to go for NetBeans.In My opinion it is better and provide great advantage over other ide but it has disadvantage over Eclipse that it grabs more more while working but do to its features and support i suggest Netbeans than any ide
Agreeing with the others. Netbeans is a pretty good IDE which also caters for other languages (PHP, Ruby, C/C++) if you're prone to using any of those. Then you get the added benefit of knowing your way around the IDE when deciding to pick up a new language.
To be fair however, I haven't had much time with the eclipse IDE.
This is subjective... I find it to be a good tool.
It depends what kind of development you're doing - for EJB stuff, many folk would favour Netbeans. It also depends how much you want to spend - I assume you're talking about free IDEs?
In my opinion if you got the resources to use, then go with eclipse. NetBeans which is awesome like eclipse is another best option, these are the only 2 I've ever used (loved, needed, wanted)
Eclipse is hands down the most popular, and for good reason!
Hope this helps.
I'd agree with some of the others out there saying that NetBeans and IntelliJ are both good IDEs. And I'd say that in using all three (Eclipse + other two), that Eclipse is by far my favorite. I found some of the documentation out-dated, but also found the support community very helpful. I started using Eclipse by jumping into the deep end of the pool: writing an RCP before ever learning the IDE. The IDE was intuitive to use, and when I found the right news groups to post to - most of my questions were already answered. The hardest thing for me (and frustrating, admittedly) was knowing how to phrase my search terms in order to get to the answer that was already posted.
Remember that Eclipse is still "relatively new" as an IDE player, though given that - it's pretty darn robust.
My only complaint about Eclipse is that with each new release, it seems to hog up more resources. With a mid-sized project/workspace, it takes seemingly forever to build (or rebuild) the project. Compared to IntelliJ, it's faster and more intuitive to use.
Don't forget that Eclipse Platform was started by IBM. There are few platforms out there.
IBM Websphere Application Developer
(WSAD) and/or Rational Application
Developer (RAD) which is a
Eclipse-type IDE from IBM (actually,
that's Eclipse with IBM specialized
libraries/plugins).
MyEclipse (never used it but it's another Eclipse-type IDE)
Sun Microsystem's
NetBeans. It's too Java-centric as
it's designed to create applications
purely in java (NetBeans runs in
Java).
IntelliJ (to name but a few)
Oracle JDeveloper (I never really liked the directory structure layout JDeveloper creates).
The advantage with Eclipse is that it can be customized to your development pleasure, plugins can be written for Eclipse to conform to your needs (e.g. The Eclipse "Easy Explorer" plugin for browsing the directory of your source in Windows Explorer).
Eclipse allows you to also incorporate other languages/SDK's, such as C++, Silverlight projects, Android Projects for development. You can also easily manage resources in Eclipse.
In my experience NetBeans are resource intensive. Oracle JDeveloper and IntelliJ aren't free though.
Oh yes, If you have issues or bugs with Eclipse, Eclipse has the ability to restart and submit the crash to Eclipse servers.
This is not really an answer, just an anecdote. I worked with guys who used emacs heavily loaded with macros and color coded. Crazy! Why do that when there are so many good IDEs out there?
I have experience with using JCreator LE. I like it because it is easy to use and it is free. Give it a try if it interests you.

Good Java Practices in Ubuntu

Hey all, my Computational Science course this semester is entirely in Java. I was wondering if there was a good/preferred set of tools to use in ubuntu. Currently I use gedit with a terminal running in the bottom, but I'd like an API browser.
I've considered Eclipse, but it seems to bloated and unfriendly for quick programs.
Java editing tends to go one of two ways; people either stick with a simple editor and use a terminal to compile/run their programs, or they use a big IDE with a zillion features.
I usually go the simple route and just use a plain text editor and terminal, but there's still a lot to be said for IDEs. This is especially true when learning the language, since hitting "spam." brings up a dropdown with all of the fields and methods of the spam object. And this is not just useful to a beginner; it remains useful later on when using unfamiliar libraries and third party modules.
IDEs also have useful tools such as GUI builders which become invaluable when doing professional Java work. So although I typically prefer a simple editor/terminal combo, I highly recommend trying out an IDE such as Eclipse or Netbeans to see how you like it and so that you'll know how to use one later on.
Eclipse may be bloated for learning needs, but will probably give you the best overall Java experience. Try working through some of the built-in tutorials if you find the interface confusing.
I too vouch for eclipse (or IDEA if you have the money, actually IDEA is better than eclipse by a small margin).
But, make sure that you know how to compile and debug without an IDE first, and also learn to read the compiler's warning/error messages - they are essential skills for developers that using an IDE can prevent you from learning.
Eclipse and NetBeans are both good options. If you don't mind paying a little, so is IntelliJ IDEA (an academic license costs $99).
As far as IDEs go, I've found Eclipse to be about the best you could ask for. If you are used to IDEs full of features like VS, it should be right up your alley, and it isn't particularly resource-hungry; the way it organizes your projects makes the whole thing pretty simple as well, and it's also good to have on your resume. If you're looking for a non-intrusive IDE, mostly intuitive and that does its job as a great assistant, go with Eclipse. Not to mention its customization options.
If, on the other side, you'd like a much more light IDE, textPad-style (why?), I'd recommend Geany; I've worked with it in the past and it's got all the basic features to get started with the language and not be overwhelmed with all the features that big IDEs can offer. But I'd still recommend to go with Eclipse as soon as you get used to the language and need the IDE to be more of an assistant.
Another vote for Eclipse. In particular, you should be able to install it from within Ubuntu, as there are packages for it in one of the repositories (I forget which one specifically, as I'm not at my Ubuntu machine right this minute). If you use the GUI package-management application under the "Admin" menu, you should be able to find Eclipse and related packages.
I'd actually just recommend Eclipse. It seems bloated at first, but once you get used to it, you can use it to develop code very very quickly (and thus it's an excellent choice for a quick bit of Java).
Features I like:
Control+1 for error fixing - it knows how to fix most compile errors - just highlight the error in the code (which will be underlined in red) and it will give you a list of suggestions. Control+1 selects the first suggestion, which is almost always correct.
You can use this error fixing feature to write code that uses methods you haven't written yet - the error fixing will create the method on the class/interface you called it on, with the correct parameters/name/visibility etc. Or, if theres a similarly named method with similar parameters, it will suggest you've spelt it wrong when you called it.
The refactoring tools are also supergreat - you can highlight a block of code to extract as a method, and it'll work out what variables need to be passed in, and what it should return (if anything). You can move variables between field and methods. You can change class/interface/variable names, and it will correct them only where it needs to (which beats a search and replace any day).
You really don't need to know many eclipse features to get the benefit of using it - and it'll dramatically speed up your coding. I wish I'd known how to use it at University.
Basically, I'd recommend Eclipse. The time saved coding will make up for having to click "yes" a couple times when you start a project..
I'm using NetBeans with success right now.
I usually just use vim, but i've actually found the IDE Geany quite intuitive with a lot of good features but not really overblown. Check it out.
EDIT: I don't think Geany is fit for enterprise-level programming, but for a quick program it's one of the better IDEs I've seen, especially if you've had bad experiences with NetBeans or Eclipse as I have.
As many others, I suggest you to use Eclipse. It works fine in linux and after a few days you will find it not so unfriendly.
Moreover, if you will start developing more complex programs in java, you already will be familiar with a standard, complete and open source IDE, which is also the foundation for many other professional IDE for other languages, like Adobe Flex Builder, Aptana Red Rails and so on.
There is an interactive "IDE" designed especially for learning: BlueJ at http://www.bluej.org/
While I generally agree that Eclipse, NetBeans, or one of the other IDEs can be very helpful, they are pretty heavyweight for a learning environment; and you can end up spending your time wrestling with the IDE instead of learning Java.
In my career I've also found some people that don't really understand what the IDE is doing for them; they are totally lost without it (see Voodoo Programming). I recommend you spend at least some of your time with a simple editor, like gedit or vim, and the command line javac compiler.
BlueJ is considered a good editor for Java, tough mostly aimed at beginners. It does not bloated as Eclipse, but contains many useful features. It is also an open source project, so you are welcome to give it a try.
In our working enviroment we have to use the free Oracle JDeveloper ... sigh .. at home I tend to use Eclipse more and I really like it
Netbeans is a heavy but good IDE. Netbeans always have many features you don't really need, but because it's made with the netbeans platform, you can always strip it down to the essentials !
If you don't like all the work, go with eclipse. It's a lighter IDE.
Geany is pretty handy, don't quite know how it is with programming Java, but with programming C and C++ it's a nice light weight IDE. (BE WARNED: Building big projects usally tend to fail in geany. Workaround: compile in Geany build in terminal)
Bryan

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