Interested in Learning Java Programming.

Hello All,
I a college student and I am interested in learning Java programming. Where would be a good place for me to start?
Thanks

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.

Similar Messages

Leor Zahavi: Interested in learning Java Mobile

Myself Leor Zahavi and I am interested in learning java mobile so that I can develop mobile applications. I have some basic knowledge of core java. Please suggest me some tutorial website to learn mobile java mobile.
Thanks
Leor Zahavi

958263 wrote:
Myself Leor Zahavi and I am interested in learning java mobile so that I can develop mobile applications. I'd investigate Android and iOS app development then. Android is based on the Java language at least, so through that path you could get yourself reacquainted with it. But you'll need a good book, not a tutorial. This is no easy subject that you learn from a few dinky paragraphs and some pseudo code.
EDIT: hm, pretty old thread.

Learning java programing - Array issues.

Hi Everyone,
I just started in java programming and into Arrays multidimensional. I started a simple 2 dimensional array with 5 names with genders. I 'm having issues because it does not want to print out the names with correct genders Male/ Female. The simple program should print out the 5 names with gender type.
example:
Jack - Male
Sally - Female
Dave - Male
Sue - Female
Brian - Male
Here is what I came up with so far:
public class Multiname
     public static void main(String[] args)
          //String[][] multiname;
          String [][] multiname =
                    {"Jack", "sally"},
                    {"Dave", "Brian"},
                    {"Sue"}
          /* multiname [0][0] = "Jack";
          multiname [0][1] = "Male";
          multiname [1][0] = "Sally";
          multiname [1][1] = "Female";
          multiname [2][0] = "Dave";
          multiname [2][1] = "Male";
          multiname [3][0] = "Sue";
          multiname [3][1] = "Female";
          multiname [4][0] = "Brain";
          multiname [4][1] = "Male";
          //int rows = 2;
     //int columns = 2;
               for(int i = 0; i < 4; i++)
                    {for(int j = 0; j < 2; j++)
                            System.out.println("multiname " + ": " + multiname [i][j]);
This is the result:
multiname : Jack
multiname : sally
multiname : Dave
multiname : Brian
multiname : Sue
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
     at MultiD.main(MultiD.java:29)
Can someone inform me what is wrong or missing, and what do I need to do to correct this. I'm new to this and I'm a visual person. Any assistance would be appreciated.
Thanks,

Welcome to the forum!
When you post code use \ on the line before and on the line after the code to preserve formatting (read the FAQ). You can use the 'Preview' tab on the reply window to see what your reply will look like.
Please edit your post and add the code tags.
{quote}
The simple program should print out the 5 names with gender
{quote}
How could it possibly do that when you commented out the lines the put the gender into the arrays?/* multiname [0][0] = "Jack";
multiname [0][1] = "Male";
multiname [1][0] = "Sally";
multiname [1][1] = "Female";
multiname [2][0] = "Dave";
multiname [2][1] = "Male";
multiname [3][0] = "Sue";
multiname [3][1] = "Female";
multiname [4][0] = "Brain";
multiname [4][1] = "Male";
When you are starting out don't use any more data than you need to get things working. You only need two name/gender combinations; any more just gets in the way.

I want to learn latest Java Programming

Hello,
I learned Java programming in 2006 in India. I am a student of NIIT and completed Diploma in IT.
Right now, I am SEO Manager in leading IT company.
I want to restart my java study at my own.
So, How can I learn latest Java programming?
If you have any ideas so, help me.

Mistry-Anand wrote:
Hello,
Right now, I am SEO Manager in leading IT company.
I want to restart my java study at my own.
So, How can I learn latest Java programming?
If you have any ideas so, help me.stick to management. Your attitude shows you're well suited to that, utterly unsuited to doing work of your own that involves any independent creative thought whatsoever.

Learning Java SE 7 / Newbie

Dear Java Community,
I'm real life I find that most professional programmers are rather selfish or inpatient personality types, and I'm interested in learning Java, and possibly becoming a good programmer. It's just a personal hobby, and something that's mostly an intellectual pursuit. My question is this, how do you compile a folder filled with Java files ? There are 27 files in this particular folder. Half are .java files. The others are .class files.
I really want to learn how to program, but as I read all these programming textbooks, they're good (conception-ally speaking), and give you nice gold nuggets of information. But I don't know how to bridge what I want, which what I need to learn, in order to accomplish it. I know that don't become a master overnight, and I guess the question should further be, how long will it take me to actually learn to program Java 7 ?
How do I compile all these files ? I downloaded the free source code from Planet Source Code, but I think these are rather old programs, and maybe they're not backwards compatible. Since I can't find anyone with enough patience to teach myself, then I'll just have to teach myself. But I learn best through backwards engineering. I need to know why this does that, and why that does this.
Can someone help ?
Edited by: user13816154 on Jan 24, 2013 9:10 PM
Edited by: user13816154 on Jan 24, 2013 9:11 PM

First of all don't blame all professional programmer.This is not right place for it
Second this category is spcly for Jdeveloper and ADF. IF you have any question regarding you can put in right category.
Regarding learning java and becoming master.I wil suggest you to step by step.Don't download free code from some site and execute it.First write small program then gradually raise ur level.Within 2 or 3months you will bw confident about java.
There are lot of other place you can ask about ur java question

Learning Java - Where do I start

I would like to learn Java programming. I have solid background in OOP. Please let me know where I can start and how I can get hands-on experience
Thank you

You need both good programming tools and books:
1. download JDK131 from sun and install it;
2. download Forte for Java 3.0 from sun and install it;
3. download Java tutorial and other documents from sun
and read it.
then you can start.

Example java programs to learn from?

Hi. I just finished the Head First Book and I am about to start on the 1.5 certification book. In the mean time, I was wondering what open source projects might be good for me to download and start reading the code for? I thought it might be a good idea to download one and go through the code, marking it up with what I think it is doing and looking up things I don't understand. Any pointers to good software to do that on, would be great!
Sorry if this is the wrong forum.
Mark

hey eko291!
I found that the easiest way to learn java was to do something with it. I set up a sourceforge site, and set about making widgets for swing that were non standard in java but found in other languages/operating systems. Looking at code to learn is a two-edged sword. On the one hand it can be great for ideas, but on the other, some people really write cruddy obfuscated code that is a nightmare to follow, let alone learn from.
Write some of your own stuff first to get really familiar with it. If you get stuck, look at some examples from Java Almanac (blood good site that one). Look for some examples from O'Reilly books etc.
I wrote some code to help me learn java. While looking at it to learn Java is not something I would recommend, you may find getting ideas from it to help out with your own projects is something useful.
Feel free. www.sf.net/projects/avianfs
Also, I got a lot of good ideas from a particular guy's blog. Romain Guy. He posts up some really super code for people interested in UI design. Looking through his code, you will be amazed at some of the things you can do with Java. You will get heaps of ideas from there.
hope that helps!
Jason Barraclough.
Message was edited by:
fireman.sparkey
because he realised that a word he used was a naughty one...

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.

Networking a java program

I'm interested in creating a java program that will run on a webserver and will be used by 4 different people interactivly, like a card game. I have created java programs before but never for a network environment and never used by more than one person at a time. could anyone point me in the right direction as to what i need to do to create this interactive network program?
thanks

well ur looking at two things. First of all, u need threading for ur program to have the ability to be used simulaneously by more than 1 person. and then u need to learn how to network program I can only suggest some books to learn network programming and I am sure you can find a lot on threading in most java books. Let me know if you wanna know the books, i can't remember the names at this point

Java parser for regular expression to java program

Hi All,
I am very new to parser technologies .I am looking for a (java)parser which can read the "regular expression" and can convert it into "java program".Please let me know is there any thing related to this.
Thanks in advance.
Your will be appriciate.
Regards,
Sai.

Hi Jos,
Thank you for your quick response .You're welcome.
If you have any sample code or simple example for how to use those
classes (Pattern,Match) ,will you please send me .It will be helpful for me.Jverd gave you two nice links already in his reply #3
If there is any "open source" for parsering regular expressions.
Please send me I am very new to parser technologies.Note that that Pattern class take care of all the parsing of REs, i.e. there's
nothing 'interesting' left for you to do any parsing whatsoever. Can you
elaborate a bit on what you exactly want to do and learn?
kind regards,
Jos

Any Great newbie books to learn java - Any Recommendations ???

Hi, my name is Chris and I know a little about web design and I want to learn java but I know nothing about programming and I would like anyone here to recommend a decend book for a complete newbie in programming to be about to get alot of a that book. I am really interested in java right now and if anyone has any great forums to learn also besides this one , that will be great.
Thanks
Chris :-)

http://chortle.ccsu.edu/java5/cs151java.html#50As always i wouldn't suggest this website you have mentioned. The order in which the topics are covered is not conducive to good learning. You see the chapter in exceptions is dealt at the end!
I would suggest Thinking In Java.
Message was edited by:
qUesT_foR_knOwLeDge

How to know if the java program is already running?

I have a simple java program, and I need some way to know if this program is already running. I need it because when I execute this program and during this execution I execute it again, two java programs are running in the Operating System. Is there any java method that tells if the current program is already running?

Hey, stevejluke and nicklap, do you know about Threads? I NEED SOME HELP, URGENTLY!!! I�ve posted the same problem two times in this forum, but nobody gave me the solution. It seems to be very simple, and I�m very angry because I am wasting a long time because this ridiculous problem. Read the text below please. If you know some suggestion or tip, tell me!
Sorry for posting this topic again. But I need some suggestion urgently. I put the last post below.
==============================
I�ve been trying to test my application in Eclipse, and I am using threads. But when I debug it, sometimes the behavior is not what I am expecting. Sometimes when I stop at some breakpoint for a long time, the debug stops to execute. Curiously the application runs perfectly in run mode.
Has anyone had this problem?
Thanks.
==============================
==============================
(m.winter)
Debugging threads works perfectly in eclipse. However be aware: If you just set a breakpoint by doubleclicking left to the source line, then its policy ist to stop the trhread, not the VM. That means, once you reach the breakpoint, only the thread reaching that line is stopped. All other threads continue running. If a second thread later also hits that line, it is also stopped. This makes it sometimes difficult to find out, where you are, as two or more threads may be suspended. You can see the status of the threads and switch between them in the treah view, typically in the upper half of the screen.
You can change the behaviour of a breakpoint to "suspend VM" by left-clicking on the breakpoint and choosing breakpoint properties.
I assume in your case, that other threads are continuing to run. They may e.g. produce data, which is supposed to be worked on by the suspended thread. If you stay a long time at the breakpoint, finally you might run out of memory or something else happens, which does not occur in run mode.
==============================
==============================
(Peter-Lawrey)
If you have anything in your code which is time depend it can run fine, except when you debug it.
e.g. if one thread times out because you have stopped another thread.
==============================
==============================
Thanx, but I didn�t understand yet.
Sorry if I commit any English language error, I�m learning English.
Please try to debug the code below:
public class Main {
    public static void main(String[] args) {
        Shared objShared = new Shared();
        Thread thread1 = new Thread(new Thread1(objShared));
        Thread thread2 = new Thread(new Thread2(objShared));
        thread1.start(); //put breakpoint here
        thread2.start();
class Thread1 implements Runnable {
    private Shared objShared;
    Thread1(Shared shared) {
        objShared = shared;
    public void run() {
        try {
            objShared.doSomething1();
        } catch(InterruptedException e) {
            e.printStackTrace();
class Thread2 implements Runnable {
    private Shared objShared;
    Thread2(Shared shared) {
        objShared = shared;
    public void run() {
        try {
            objShared.doSomething2();
        } catch(InterruptedException e) {
            e.printStackTrace();
class Shared {
    private boolean x = false;
    synchronized void doSomething1()
        throws InterruptedException {
        while (x) //put breakpoint here
            wait();
        System.out.println("Doing something 1");
        x = true;
        notifyAll();
    synchronized void doSomething2()
        throws InterruptedException {
        while (!x)
            wait();
        System.out.println("Doing something 2");
        x = false;
        notifyAll();
}"If you stay a long time at the breakpoint, finally you might run out of memory or something else happens" - I don�t wait a very long time. Just few seconds in the "while" breakpoint is enough to debug stops the execution.
"You can change the behaviour of a breakpoint to "suspend VM" - I did it, but in properties I didn�t find any thing to configure in order to debug perfectly.
In debug mode, when I press F6 button rapidly, this program is executed perfectly. The problem occurs only if the debug is stopped for few seconds in breakpoint. Try it, I�m really interested in the cause of this behaviour.
Thanks a lot!
==============================
I don�t know why does this behaviour occur! If anyone has the solution for my problem, please tell me!
**************************************************************************************************************************

Best way to learn Java. Free resources online?

Hello. I would like to start to learn Java but have no programming background except for Visual Basic and the basics of PHP. I started to learn about a week ago and now have a good understanding of some of the basic concepts, such as the IF, SWITCH, LOOPS, PRINTLN, ect. I am very interested in developing applications for the Blackberry and was wondering where I should start and what I should learn. Must I learn the entire Java programming language to start to develop mobile applications? Are there any free resources on the Sun Java website that would be able to help me learn?
Thank you
Edited by: n3xtgen on May 20, 2010 12:27 PM

n3xtgen wrote:
Must I learn the entire Java programming language to start to develop mobile applications?Depends on what you mean by "entire Java programming language". You should probably have a solid understanding of the language and concepts before attempting mobile development.
The Java language itself is the same when developing for mobile devices (except you may be forced to rely on an older version of the language). But debugging/deployment/running your code becomes more complicated as soon as you target mobile devices.
Therefore I suggest you take some time to learn "normal" Java development. It will definitely pay of in the long run.
Are there any free resources on the Sun Java website that would be able to help me learn?There are [the tutorials|http://java.sun.com/docs/books/tutorial/]. They are pretty useful.

Need help in creating a java program

Hi everyone.
I'd like to say before i start about my problem, that i've only begun learning java and my teacher hasn't explained anything at all. He only showed us by doing it himself and then showing us the final version. I've searched a little on how to program but i get little success in finding a good tutorial.
I need help creating a program which has been assigned to me due in a few days in which i can't contact my teacher for help.
I need to write a java program which inputs 3 items. The number of kilometres you drove, the number of litres of gas you used and the price you paid for the gas. Then, the program must calculate the number of litres used per 100km driven, which is litres divided by kilometres times 100, how much it costs to drive 100km, which is the result (a) times the price per litre and the number of miles per American gallon of gas ( one American gallon = 3.785 litres, and one mile = 1.609 km.
The program has to output my name, the inputs given, the results computed and a message saying "Program Complete".
To give you what i've done to begin with, from what i understood, is:
import javax.swing.JOptionPane;
public class prog1
     public static void main(String args[])
          final double americanGallon = 3.785;
          final double mile = 1.609;
          kilometresDriven,
          gasUsed;
          priceOfLiterGas;
          System.out.println("My Name");
          System.out.println("Number of kilometres driven:");
          kilometresDriven = JOptionPane.showInputDialog ("Kilometres Driven");
          System.out.println("Number of Litres of gas used:");
          gasUsed = JOptionPane.showInputDialog ("Litres of gas used");
          System.out.println("Price of a liter of gas:");
          priceOfLiterGas = JoptionPane.showInputDialog("Price per liter");
Up to now, that's all i've got. i know i'm wrong, but i'm not sure how to do this. Could someone give me an outline of what this program is suppose to look like?
Thanks in advance.

Here's an update on my program. I've worked on certain details and would need your comments whether it contains errors. I'd also want to know if it would work or not because i don't know how to check it on my computer.
Here's the update:
import javax.swing.JOptionPane;
public class Prog1
public static void main(String args[])
String name;
double kmDriven;
double litresUsed;
double pricePaidForGas;
double priceOfALiter;
name = JOptionPane.showInputDialog("Name");
input = JOptionPane.showInputDialog("Number of km driven");
kmDriven = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Number of litres of gas used");
litresUsed = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price paid for gas");
pricePaidForGas = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price of a litre of gas");
priceOfALiter = Double.parseDouble (input);
a = (litresUsed/kmDriven)*100;
b = ((litresUsed/kmDriven)*100)*priceOfALiter);
c = (kmDriven/1.609)
System.out.println("Name:" + name);
System.out.println("Number of litres used per 100km:" + a);
System.out.println("Cost of driving 100km" + b);
System.out.println("Number of miles per American Gallon of Gas:" + c);
System.out.println("Program Complete");
System.exit(0);
Comments please.
Thanks in advance

I did write a simple java program but it is not working please help me.....

This is the program I wrote LineRect just to draw a line a rectangle etc...... Y it is not working How can i used the same program to run without using applet that is by using awt and swing.........Pls Help me.............
import java.awt.*;
import java.io.*;
public class LineRect
{public void paint(Graphics g)
     {g.drawLine(10,10, 50,50);
     g.drawRect(10, 60, 40,30);
     g.fillRect(60,10,30,80);
     g.drawRoundRect(10,100,80,50,10,10);
     g.fillRoundRect(20,110,60,30,5,5);
     g.drawLine(100,10,230,140);
     g.drawLine(100,140,230,10);
<APPLET
CODE =LineRect.class
WIDTH=250
HEIGHT=200>
</APPLET>

There are many significant errors here for instance you are using a class file as if it were an applet yet you do not subclass applet. Your code has no init method (if it is to be an applet). Your best bet is to go through the tutorials one step at a time. One thing to consider is to subclass a JPanel and draw on the jpanel overriding the paintComponent method. This can then be added to a JFrame or a JApplet's contentPane and would allow the same graphics in both. But again, please study the tutorials on all of this, otherwise you will be doing hit-or-miss programming, and that is no way to learn.
Much luck!
Addendum: Also, if you are just beginning in Java programming, I suggest you start with the basics and not with Swing / AWT / graphics programming. Otherwise you will just end up bruised and disappointed. You have to learn to walk before you can run.
Edited by: Encephalopathic on Dec 26, 2007 5:09 AM

Interested in Learning Java Programming.

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