Compile Java

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Ok, so I found two lcations of this javac and every time i click on either one of them a window flashes by and disappears? How the heck are you supposed to run javac? How do you compile? The link doesn't help. It assumes you know how to compile. Sorry, I'm new to Java and I just wanna learn how to compile.

Newbie Poster

5 posts since Oct 2006

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open your command prompt.
Change your directory to wherever your programs are...
Eg if they are in C:\java, then:
cd c:\java ENTER
Then javac fileName.java ENTER
That line compiles it, and creates a .class file,
Next... to execute the program...
java fileName.java ENTER

If you used an IDE like netbeans 5.0 or something else, you don't have to bother with this, but they can be confusing to start with, so I recommend just playing with notepad and command prompt till you get the hang of basic java.

cms271828

Junior Poster

123 posts since Oct 2006

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OK, I got as far as getting into the C:\java folder, but there is no javac found so it stops there. I'm sorry. I'm a total newb here.

I ran the code javac MyFirstApp.java ENTER like you said, and I get an error saying it's not a command. HELP!!

Newbie Poster

5 posts since Oct 2006

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I made a little error above,,,
you just need to do java fileName to execute.

Ok, try this...
cd c:\java ENTER
SET CLASSPATH= ENTER
javac fileName.java ENTER
java fileName ENTER

That might work, but your JDK needs to be set up correctly, the command prompt needs to know the path to the JDK, you can do this by modifying the AUTOEXEC.BAT file.
Let me know how it goes with the commands I mentioned first.

cms271828

Junior Poster

123 posts since Oct 2006

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C:\Documents and Settings\Compaq_Administrator>cd C:\java

C:\java>SET CLASSPATH=

C:\java>javac HelloWorldApp.java
'javac' is not recognized as an internal or external command,
operable program or batch file.

C:\java>java HelloWorldApp.java
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/java

C:\java>java HelloWorldApp
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp

Still nothing. The official javasun site had a different way of resetting the path though. I don't understand either way...heh

Newbie Poster

5 posts since Oct 2006

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Post the code your trying to compile, the last couple lines in your last post look to be issues with your code

JaksLax

Newbie Poster

21 posts since Sep 2006

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/**
 * The HelloWorldApp class implements an application that
 * simply prints "Hello World!" to standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // Display the string.
    }
}

Newbie Poster

5 posts since Oct 2006

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For what it's worth, go to http://www.jgrasp.org and download their very easy to use GUI-based editor. There are not a lot of bells and whistles, but it is free and is a decent enough compiler.

Additionally, the actual Java compiler should be in a directory called jdk1.5.0_08\bin. This is providing that you have JDK installed correctly.

You are getting this error message:

'javac' is not recognized as an internal or external command,
operable program or batch file.

because the compiler is not in the directory that you are trying to run it from. Try this:

cd c:\java\jdk1.5.0_08\bin

c:\java\jdk1.5.0_08\bin>javac HelloWorldApp.java

c:\java\jdk1.5.0_08\bin>java HelloWorldApp

I followed the above steps and got the proper output:

Hello World!

jaden403

Newbie Poster

17 posts since May 2006

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I've installed just about every link I can find off of JavaSun's website and JGrasp still says I havent installed the right environment.

Newbie Poster

5 posts since Oct 2006

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ok THIS WILL WORK FOR SURE.
delete everything and go to this download page and download the j2sdk1.4.2_12 version for windows.
http://java.sun.com/j2se/1.4.2/download.html
Then download this version.
J2SE v 1.4.2_12 SDK includes the JVM technology[IMG]http://java.sun.com/images/pixel.gif[/IMG]The J2SE Software Development Kit (SDK) supports creating J2SE applications. More info... [IMG]http://java.sun.com/images/pixel.gif[/IMG] Download J2SE SDK [IMG]http://java.sun.com/images/pixel.gif[/IMG] Installation Instructions ReadMe ReleaseNotes
Sun License Third Party Licenses

i am assuming you know how to install anyways after installing you need to know where your j2sdk1.4.2_12 folder is. just for instance lets assume you have it in c drive. go to start and then run command prompt window. enter cmd. you should have a path something like this
c:\documents and settings\chris
well do this first
cd..
after that you will have c:\\documents and settings
well do the same thing one last time so then you are in your c:\
cd..
now you will have the screen something like this
C:\
i am assuming your j2sdk folder is in c drive so you will do this next
cd j2sdk1.4.2_12 (then press enter)
now you will see your command prompt like this
c:\j2sdk1.4.2_12
then just type one last command.
cd bin
now your command prompt looks like this
c:\j2sdk1.4.2_12\bin
Thats it BOYyYyyyYyy You got it. The next thing you need to do is type your code in a notepad and make sure MAKE SURE YOU SAVE IT IN THE BIN FOLDER WHICH IS IN J2SDK1.4.2_12 and save it as a .java file e.g :) (HelloWorldApp.java) in the bin folder.
Now go to your command prompt i hope it is still in bin directory
type this
javac HelloWorldApp.java
no errors HURRAY !!!!
then type java HelloWorldApp
Have fun BoYyYyyYy

fastmike

Newbie Poster

9 posts since Sep 2006

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hey fastmike ,
thx it helped me a lot

but there r 2 things i am yet concerned to ask

1) can i run this programs when i save them in sum diff folder ?
there must be sumthing which enables the path where javac
can b enabled
eg in f:\girish\example.java

can i run this program there and not just in bin folder
c:\j2sdk...\bin

2) whenever i tried typing cd j2sdk1.4.2_13
it said invalid folder name
so i renamed it to java2_13
will it harm other programs or jre ?
do i need to make any changes sumwhere also ?

and thx again it helped but wish i could save my programs
in sum oter files

grii_19

Light Poster

30 posts since Jul 2007

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grii_19 do not use this approach, this is considered bad practice to save anything into Java instalation folder. Please follow the link to the tutorial which I gave it to you in another post

peter_budo

Code tags enforcer

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15,436 posts since Dec 2004

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Oh man, the deaf leading the blind.

I have no idea where this "save it to the bin folder" stuff got started, but here ye, what rubbish.

I know, I know, now you're going to come back with, but it works and its better than nothing, so whats wrong with it.

Well, if your foot itches you can cut it off, it works, and it's better than nothing, but there is still definately something wrong with it.

masijade

Industrious Poster

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4,253 posts since Feb 2006

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hey peter
thx ..... yep i followed ur advice from other forum
and itz working properly now
thankz bro .....

blind leading the deaf ??????????????????????
didnt got wht it meant but no longer saving the files in
bin folder ......
so thank you

grii_19

Light Poster

30 posts since Jul 2007

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The blind leading the deaf is just a "cute" way of saying that the help being given (at least by some) is bound to cause a lot of confusion, misdirection, antics, and probably dangers. Not that they are intended, but they are going to happen (and it will usually by comical).

masijade

Industrious Poster

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