Why learn Java now?

I'm new to Java programming and have developed some small demo classes.
I have exp with other Visual languages and I feel like I'm taking a step back in time writing code in Notepad and compiling and running from dos etc.
I have several classes and lots of code lines to do a simple thing in swing like create a frame and a simple menu panel.
I thought Java required less code but so far it requires 3 times an much as other languages!
What visual tools or IDE�s exist for Java development other than Sun ONE Studio?
Why learn java now? The number of jobs posted online seams to be higher for Java that any other language out there like vb.net, C++ etc.
Any Comments of the Future of Java Jobs?
Running Java:
My apps run slow on XP, 384M ram.
Do production Java applications suffer from slow execution of the JVM layer?

Java code is easier to understand and more stable than "faster" languages. There is more flexibility and extensibility than in other languages, and the error-processing system is quite advanced. There are also very powerful tools you can use out-of-the-box, like JOptionPane:
import javax.swing.*;
public class Foo
    public static void main(String[] args)
        String pass = JOptionPane.showInputDialog(null, "Please enter your password");
        System.out.println("Password="+pass);
Also see javax.swing.JColorChooser.
-Tim

Similar Messages

Why learn Java if you know ColdFusion?

ColdFusion is awesome for my work. I can make anything I want with it and seeing as 99% of my work is making web applications, I haven't needed to look elsewhere.
I was just wondering why anyone would need to learn Java, if you already know ColdFusion... I understand that ColdFusion runs on Java, but is there anything special I could do with Java that is not possible in ColdFusion for use in websites?
It intrigues me because I have to cover the work of an ASP.NET developer, and when I was looking at his C# code (which looked very similar to Java) it made me cry to think people make websites in this way. Compared to ColdFusion it looks archaic but then I remember that CF works with Java so I thought about looking into learning Java. But is there any advantage to me doing this?

Correct, but it does depend on the app. I have written some high volume apps in CF only and not had an issue. But my primary work is with developing and maintaining a payment gateway and due to the nature of the application there are a few non-native CF components (both Java and Delphi). The beauty of CF is it's ability to seamlessly mix if you have to. But again, I prefer to keep non-CF dependancies to a minimum.

Why learn Java Instead of C++ or...

Why should people learn Java and use Java than C++ or other programming languages?
Some of my personal reasons are:
1. Java supports four look and feels without having to create them from scratch, they are already available for quick use.
2. Java compiles fast, and runs fast. It's easy to understand. You can *.jar it into one file! No *.dll's!!!

I like Java too (duh!), but...
Why should people learn Java and use Java than C++ or
other programming languages?
Some of my personal reasons are:
1. Java supports four look and feels without having
to create them from scratch, they are already
available for quick use.
What? how is that an advantage over much of anything? OK, you could say that you can write a very complex GUI application and have it run on a number of very different applications using a common L&F or a platform-appropriate L&F.
2. Java compiles fast, and runs fast. It's easy to
understand. You can *.jar it into one file! No
*.dll's!!!Before there were .DLL's and .so's there were big-ass executable files with everything linked into them. Oh wait, you can still do that on Win32 and Unix if you want to (except of course for the OS shared libraries which Java's JRE needs too).
Chuck

For all the newbies who wants to learn Java

I was a newbie like 4 months ago. i have some skills of OOP in C++ like 2 years back but since then i did'nt took any of programming language courses. I have experience in MSaccess and MYsql. i did my internship Last summer with Tennessee Education Lottery as a Database Analyst. At that time i realized what a Corporate Enviorment looks like. Trust me it was a formal interview and i passed it and they placed me in the IT department to write some scripts for the GUI terminal and at the same time create a Company Security Database. i did completed my project but i had to Learn Mysql. and then i realized Java was getting very popular. alot of people told me in the forums to go Java tutorial but i will not agree to start from the sun tutorial. you can do it only if you have a good or may be medium experience of OOP. it was really tough for me and then this magic guy came on the forum and told me to go on this website if you want to learn Java.
http://chortle.ccsu.edu/java5/cs151java.html
This site is a brilliant site specially the exercise problems and the quizes really attracted me to Java alot and now i came to realize how easy it is to program in Java rather than C++. Java forums have helped me alot in solving those exercise problems (not with the code but with a good explanation) which was very helpful for me. out of my 210 post i guess i have helped 30 people out and the rest of the questions are regarding those exercises. i came to know encapsulation, inheritance and all that stuff. though i am still not very perfect like i am still having trouble with ComparTo thing but it takes more practice. the more you practice the more you learn. so all the newbies if you really want to learn java even if you dont have any experience in OOp this is the site where you need to start. Hope this will definitely help you alot. thanks to all the Senior members navycoder, captain, paulcw, duffy, turingpest and others also who have helped me in the past. without you i would have not achieved the goal of learning java. now my next step is going to be learn GUI programming Swing. looks fun to me. but at the same time i have my final project for this semester to make on ONline Testing program which will have a database, php scripting and html and xml.
I will post if i have any problems

I was a newbie like 4 months ago. i have some skills
of OOP in C++ like 2 years back but since then i
did'nt took any of programming language courses. I
have experience in MSaccess and MYsql. i did my
internship Last summer with Tennessee Education
Lottery as a Database Analyst. At that time i
realized what a Corporate Enviorment looks like.
Trust me it was a formal interview and i passed it
and they placed me in the IT department to write some
scripts for the GUI terminal and at the same time
create a Company Security Database.Wow they really must like to gamble if they put you in charge of a security database - no offense meant, but that isn't the sort of thing you would want a brand new person working on, unless of course they were giving really high odds ;-)

Is it worth to start learning Java

Today I saw a post in JavaRanch (http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=33&t=017317). A guy asked a question for his friend about STARTING to learn Java NOW. Actually, I heard quite same question from people around myself.
For myself, I've been working on Java more than 7 years(already SCEA, hehe). However, the Java passion is getting away ;-((, I am looking around for other stuff like Ruby.
I have same confusion as that guy, and I'd like to learn from you guys for same question - for the current market situation, it is late/okay to touch Java?

thank for all the input.
my concerns are, particularly for newcomer, the
learning curve and the market trend.
my understanding is Java is losing its powder in web
application development comparing with other emerging
language like Ruby/Python, conversely, Java's powser
is going to server side(business/integration layer).Don't be so sure about that.
Java's not losing powder [sic] in web app development. It's mature and considered a standard for enterprise scale problems. Ruby and Python are gaining traction for smaller CRUD-like Web apps, but neither is up to snuff in the areas of security and transactions. Ruby is gaining popularity because of Rails, which makes creating simpler web apps easy.
Criticism of Java for complexity and a dearth of tools is fair. But are Trails, Grail, and AppFuse strong enough answers to Rails such that Java EE can be more agile for smaller apps? Time will tell. I think Spring and Hibernate are helping a great deal, more than EJB 3.0 will.
everybody knows it is hard thing to learn java,It's hard to learn anything, period. Programming in any language is a long learning curve, because it's so much more than just language syntax. You don't do enterprise apps just by learning Java, even if you stick to the EE platform. You have to know SQL and relational databases, messaging, XML, HTML, JavaScript, HTTP...the list is pretty long. All those technologies carry over to .NET and Ruby and anything else, so it's not just Java that's complex. Enterprise problems are complex.
And once you know all that, there's the problem of designing elegantly. It's a long climb no matter which language is on top.
regarding to server side programming for a java
newbie, it would be much harder to learn, further, it
will take you long long time to learn server side
java programming.
however, the job market (java) is still hot, and
seems to keep hot. and people still wanna jump in.It's still good, just not crazy like it was at the end of the 90's. There is the problem of competition from China, India, Vietnam, etc. that won't go away. But what field hasn't been affected by global competition? Only those areas where you have to touch the client, like auto mechanics. Even medicine has been affected - x-rays can be read anywhere in the world.
So, still confused to tell people whether or not to START java...;-((If you like programming, jump in. Learn Java, but it's more important to learn those bedrock technologies (e.g., data structures, compilers, parsers, finite automata, decomposition, relational databases, etc.) and learn how to learn. Languages will come and go. When I jumped into this field ten years ago C++ and Corba were the rage and Java didn't exist. Now I make a living writing Java. I'm reading about Ruby and Rails now, just dipping my toes into the water.
None of us are any better prophets than you are. I don't know what will happen or if Java will still be here ten years from now. COBOL and FORTRAN were born in the 50s, and both are very much with us today.
Just stop whining about it. Do what makes you happy, and stop worrying about what other people think.
%

Should I learn JAVA or C#?

Should I learn JAVA or C#? Or...both of them!?

For the record, C# does not support multiple
inheritance. It is very much like Java except that it
has a few extra goodies thrown in. For my tastes, it
is not as pure as Java, but it is an improvement over
C++ and it has a few things, like operator
overloading, that would look nice in Java. Hey! Wait!
Stop! Stop the tomatoes! Please!Ugghh, operator overloading. What a nasty nasty thing that was. Why change something you have been seeing since you were in diapers to mean something else. + should alwalys be plus because we have all grown up knowing that. Imagine if you had a child and for the fun of it you taught him growing up that his left hand was his right hand,think of all the confusion he would have when he is learning how to drive and his instructor tells him to take a left. Even though he may learn that what he believes is left is now right he will always first think of his left hand as his right.

Im Trying To Learn Java :o(

Hey All,
I have decided to get my mind active and randomly learn Java. I say randomly because i am going to be a student again in IT but i like the kinda 3D side and modelling and nice pictures and flash actionscript lol not all this stuff.
Anways i would just start by saying that Java offends me massivly, i know something happened with M$ and Sun and ever since then all i have had with the sun download is problem after problem and crashing and all iw as tryin to do was play some Jippii games. This aint a recent problem, it always happens and i must have reformatted xp around 7 times. So i stay away from applets!!!
Anyways in 2002 when i started learning Flash it was because i seen a site i liked and wanted to do that. The equivelent is kinda like me saying "OK GUYS I HAVE JAVA NOW HOW DO I MAKE DOOM" anyways 2 and a half years later im happy with what i can do and have used alot of different apps and learned alot from 3dsmax to aftereffects etc.
Anyways my goal out of this whole Java thing is to make a game like one i used to play when i was younger on the Amiga 500. No where has this game and a modern one would be great to play. The graphics suck but the physics were really nice.
So my questions are:
1) Java. Ok im going to be honest, i know nothing about Java, i dont even know if it can do what i want and what i really dont want is to spend a while learning this to be stuck with no effects for my game, ie are small particle effects possible in Java? I know Java is pretty slow for a proper language compared to C/C++ but how slow? Can you shift a hundred particles around the screen and still add physics in the background?
2) Java. The whole thing confuses me massivly. Im not a big posting person as i tend to prefer searching but i dont even know where to begin. I will bite the bullet and say i aint going to have alot of problems with the syntax of the language itself. It all looks kinda how i expect it, obviously i dont mean i aint gonna have problems and lot of them but it is not REALLY alien to me to look at a bit code. At the same time it is. I need to know alot of stuff, things that the 2 ebooks i have just ignored. For example, when i compile something, i thought that meant it compiled to the EXE but infact it turned my "heyworld.java" into a "heyworld.class" file. This just makes no sense to me atall because i HATE command line stuff, i see it as reinventing the wheel so im trying to follow through on first of all netbeans (an that went off almost instantly) and a free one that got my hey world to work (well, class). I need to know if a compiler dont make a exe then whats the class for and what exactly is a class file. You know just stuff like that? Does anyone know i kinda dictionary so to speak? baby talk i mean, so far all i seem to get is explainations with words i dont understand.
3) How difficult is it to make a 2D game in Java? To make this plainer, i aint having an applet run somewhere, i want a nice downloadable exe. Of course i will need to start at the beginning but i mean to get a ship on the screen with keys to move it and a "cave" roof to crash into, is this going to take a long long long time to get to that stage? You see, as i said before unless after a few days i have a object on screen to work with, i just get too bored to continue. for example "the object of this is to make a red circle move across the screen" REALLY interests me where as "today we are going to make a mock system for a small business user" sends me back to 3Dmax and the lighting i was reading about lol I tend to look at a piece of code and be devestated by its complexity then try and make it make sense over time. Is this possible with Java? It does work for me this, i was picking apart a isometric code in actionscript before i knew what a tween was.
4) Theres so many different J*** J"EE things floating around that i dont actually know what one i am meant to use? I got 1.4.2 i think but thats all i know. Id like any other things that helped yourselfs start off in Java?
Sorry to go into a bit detail here, its just that with this degree im starting, it soon branches off into 2 groups. Programmers and Designers. I feel i know the design side well enough to make a comparison but it would be rude to leave this side of the things out and write it off without atleast giving it a shot.
Thank you very much for your time :o)
Kind regards,
Clarky.

If you want an idea of what's possible with Java, do a google search for "java games" or something like that. I've seen occasional postings of what are supposed to be pretty cool games that have been written in Java, but I'm not into games, so I've never bothered to check 'em out personally.
As to whether you can do it, well, you'll have to figure that out. Learning Java well enough to create a video game is not a trivial task. I don't just mean the syntax of the language, I mean the many APIs you'll be using, concepts like multithreading and exception handling, good OO principles, etc. Without a good handle on that stuff, your code will quickly turn into a morass that will be difficult to enhance, maintain, or debug.
I suspect that the code to make a particular graphical event occur will be more verbose and complex in Java than in ActionScript, given that Java is a general purpose language and AS is more geared to GUIs. Nonetheless, I'm sure there are APIs out there (some free, some not) that will provide some higher level constructs than the core APIs to make some of that easier. You'll still be operating in the idiom of a general programming language though.
There may also be a hybrid solution available--where you use Java to express the game logic and another language to express the graphics. I don't know anything about this kind of stuff though, so that's just speculation.
You may get more precise advice in the GUI Building forums on http://forum.java.sun.com/ than here.
Here are some resources to get you started on Java in general.
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java.

Why is Java update asking me to install openoffice?

I have installed Java jdk 1.6.
Now the update notification is asking me if I want to install openoffice.
I am not interested in that kind of notifications. (By the way I already have installed open office)
There needs to be a differentiation between java updates and other updates (3th party tools). Then I can switch off that kind of notifications.
I am only interested in Java updates.
Why is Java update asking me to install openoffice?
Thanks and regards,
Cees

It's probably asking you to update to iOS 8.2, which includes support for the upcoming Apple Watch.

How did YOU learn Java?

Ok, two part question and a bunch of help for this Java newbie:
1. How did you learn Java? Online tutorials, books, discussions, a game, or a class? Be specific and think back to when you looked at a Java program and went "wtf?"
2. How do you keep up the new versions and therefore, useless older classes? I am reading the list on JDK 1.4 and just thinking, how could I remember all of this? If I'm used to programming one way, how can I relearn for every version?
If I could just get some honest answers and opinions, it'd be greatly appreciated, Thanks!

Get this:
I originally 'learned' Java from "Java Made Simple" by Peter McBride. "Made Simple" is right: having finished this book, I had no idea that you could design your own classes for use by other classes! All my methods were static, I'd never written a constructor or instantiated one of my own classes, and my applications were all contained in a single class! I had only the vaguest notion of what "object oriented" meant, and I wondered why, for example, you had to say
Integer x = new Integer(4);
but not
int x = new int(4);
The book was intended, I think, for non-programmers who have been given some free space by their ISP to design a web page, and want to add some v. simple applets for decoration. Beware of books like this if you want to learn Java in a serious way.
For a more positive tip, I recommend Sun's very own online Java Tutorial. It covers all the key topics thoroughly and clearly, so at the end you have a good understanding of Java (More than just the basics, I'd say). If you want to move on to more advanced topics this tutorial will probably stand you in good stead (I can't be certain as I haven't moved on from here yet myself), but if you don't you will still be able to write good amateur programs.

What is the best way to learn Java? I am a complete spacker?

Hi,
Please can someone point me in the right direction on how to learn java properly, I was just browsing the Sun website and came across; [http://uk.sun.com/training/catalog/java/packages_java.html?gclid=CO2-6YrWu5kCFUsI3wodZ1qI5g]
Who are these packages aimed at? I was looking at the top one; Entry Level; Sun Certified Java Associate.
Thanks.

I am a complete spacker.
Please can someone point me in the right direction on how to learn javaWith an admission like that, what makes you think that anyone would want to "point you in the right direction", so that you might, one day, if things go to plan, be the "spacker" (as you so eloquently put it) sitting next them, asking gumby questions all day, spounging ideas, and doubtless claiming much more than your fair share of the credit, and the donuts.
Yep, I'm fixated on the donuts. They're very nice ;-)
Now... what where you saying?
I was just browsing the Sun website and came across; [the training catalog|http://uk.sun.com/training/catalog/java/packages_java.html?gclid=CO2-6YrWu5kCFUsI3wodZ1qI5g] and was looking at: Entry Level; Sun Certified Java Associate.
Yep that'd be the one to aim for when you're starting out... Personally, I recommend you give the whole certification thing a miss (at least for now) and just get into the tutorials, and grab some books (there are some really excellent ones) and just write some programs... at least until such time as you feel confident enough in your chosen field of endevour to not even consider intruducing yourself as "Hi, I'm a complete spacker"... I'll bet you're a real hit in job interviews. Good grief!
Cheers. Keith.
Edited by: corlettk on 24/03/2009 23:56 ~~ Clearer.

Re-Learning Java Web Technologies

Hi
For the last 2 years, I have been developing ASP.NET applications. Therefore, I have not followed any new developments within Java industry.
However, now I just want to re-learn Java web technologies.
Therefore, could you kindly inform me whats the best book that can give me a good ground intp Java web / Enterprise development.
Thanks

Thanks for the answer.
When I was doing ASP.NET development, I found these 2 books useful:
http://www.amazon.co.uk/gp/product/1861008031/026-2514404-8364464?v=glance&n=266239
http://www.amazon.co.uk/gp/product/1861008163/026-2514404-8364464?v=glance&n=266239
These books showed how to develop a full working website with asp.net.
I wonder if there are similar books for Java. I am not a beginner with Servlets or JSP. I just want to know how to put together a full working website with the latest Java technologies.
Core Servlets and JSPs is definitely a very good book.
Kind regards

Why is Java better than c#. most people say c# is better

I have entered forums and end up seeing informations on c# being better than java. Pls can any body tell me what makes java better than c#. This days every one i know is now going c#. They are discoraging me to also go c#.
i am quite con fussed. The only thing that keeps me to JAVA is platform independence.

Well, I suppose you can search Google for 'C# vs java' and read an article such as
http://en.wikipedia.org/wiki/Comparison_of_Java_and_C_Sharp.
However arguing which is better is best left as an exercise for developers with a lot of experience in both languages rather than those just starting out (If your just starting out, you will not use the advanced features one has over the other).
I think the market will be evenly split between both languages for quite some time. Ideally, as a professional developer you should know both well so you are more employable. For Java, I suggest getting familiar with The Eclipse IDE since its used by the bulk of Java developers. For C#, I suggest you install Visual Studio Express because its used by the bulk of C# developers (and the express version is free).
I suggest you first learn one or the other very very well and good coding practices before learning the other language to avoid mixing the two somewhat different coding styles.
I suggest learning whichever language your friends are using assuming you communicate with them about programming often (so you can help each other). If instead your on your own, I suggest you learn Java. I think you will have an easier time picking up the Object Oriented philosophy than C# because in my opinion Java is more low level coding and C# is more high level coding (ie, the advanced features it can do a lot for you). You should have a good handle on the low level concepts first. In may opinion, once you know Java well, C# is a lot easier to pick up since they are both object oriented and are very similar object oriented languages.

Learning Java in order?

Is there a specific order to learning java. What I mean is, I hava already gone through the fundementals of java at the Java fundementals tutorial on the java.sun.com tutorials page. Now that I have gone through that what is next? JDBC? Servlets? JSP? I hardly ever use swing, or applets, but I need to also study enough of everything so that I can take the java certification exam later. But, I still dont know if there is a learning order to java. Do I need to learn servlets before JSP, or vise versa. Do I need to know JDBC stuff before I learn Servlets or JSP? The java tutorials page is not in any order except in the date that the tutorial came out. They still have tutorial that go back to 1997, and I am sure some things have changed since. They also have specialized areas, such as Collections, JavaBeans, RMI, etc... I am confused on this. Could someone give me a clue.
orozcom

Duffy,
Thanks for the response. I looked at the tutorial
again, and their is another java trail, "Essential
Java Classes", which covers: exception handling,
threads, io reading and writing, setting program
attributes, and accessing system resources. I think I
will go over that information first. Then, I may go
into the specialized trials that have collections and
what not. after that, I think I will go into the J2EE
stuff, doing Servlets, and JSP's unless I need to
learn that stuff before hand. Tell me what you think.I think that's wise.
Here is the site:
http://java.sun.com/docs/books/tutorial/index.html.
Do you think I need to go over the basics of Swing,
Applets, GUI's, and in the order they specify?Personally, I don't use applets at all, but I know some folks here do. On those occasions when I have a UI, it's usually Web-based, so JSP and HTML are more important to me. I have done Swing, but not in a long time. Swing is worth knowing, and all learning is good, but the decision about where to spend your time is up to you.
All I'm saying is make sure you have J2SE firmly in hand before you venture into J2EE, because J2EE builds on J2SE.

Learning Java but have problem displaying dialog

I am learning Java by building a Platform based application. I have build the basic structure with several menu items and successfuly build two set of modules (an XML file reader and a set of initilization rouitnes. I amnow branching into a module to execute when a menu item is selected. I want to display a new window/dialog that contains a table showing the user options. However, I never get anythng displayed. The following code is from the menuitem handler. I commented out the logic I want to start working with, in an attempt to get something displayed. No Luck. I really need some help.
public final class EditPreferences implements ActionListener {
     @Override
     public void actionPerformed(ActionEvent e) {
          JFrame frame = new JFrame("User and Project Preferences");
          JPanel panel = new JPanel();
//          JTable table = new JTable( new PrefTableModel() );
//          table.setRowSelectionAllowed(false);
//          JScrollPane pane = new JScrollPane(table);
//          table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//          panel.add(pane);
          frame.add(panel);
          frame.setVisible(true);
}I have been looking and reading all over the web and cannot figure this out. I think it should work, but is does not.

If "frame" is a JFrame, as it is in your code, then (as of Java 5) frame.add(panel) is the same as frame.getContentPane().add(panel) . See Javadoc for JFrame.add . So, that's not your problem here.
Try calling:
frame.pack();before you call frame.setVisible. And, of course, uncomment the lines. Right now, your JFrame will still look empty, because your JPanel is empty.
If you just want to see if a JFrame will display, you could replace the commented lines with something very simple:
// Default layout of content pane is BorderLayout, default location is BorderLayout.CENTER
panel.add(new JLabel("This is just a test."));

Learning Java on Leopard

I wanted to learn java and have Mac OS X 10.5.1 (Leopard). When I type in "java -version" it says I have version 1.5 (which I guess is Java 5). But the tutorials on the java.sun.com website are for java 6. It gives a link to download java 6 for Mac OS X at apple's developer's site. The download at the site, however, is for Mac OS X 10.4. Will this work for Leopard? Is there another place to download Java 6 for Leopard? Thank you in advance.

I've been learning Java on windows for a while now using Java 6 (and the tutorials it has), and when I switched to mac all I had to do was recompile the files and they worked fine. It doesn't seem there's any major differences between the versions that someone just starting out would notice.
(I think it's actually better to keep java 1.5, since when you compile from it for web applets you know they'll work on other macs, whereas the programs I'd compiled using Java 6 weren't working on my mac)

Why learn Java now?

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