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Jul 27th, 2004

Compile Java

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how do I compile and run a java program?

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JavaBean

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Jul 27th, 2004

Re: Compile Java

to compile i believe you would run javac file.java and it should compile and to run it you would just use java file.class
and that should do it i believe

you will have to locate these 2 files on your system javac and java i but not sure. this is of course if you are just running a command line program and not an applet

http://www.iam.ubc.ca/guides/javatut....1/stepbystep/

i have always just used text pad to do all my java stuff in cause you can set it up to compile and run your program

big_k105

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PFO Founder

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Jul 28th, 2004

Re: Compile Java

This link may help you to understand how to compile and run java programs.
The only thing is I cant find which windows operating system its for, probably windows 98, 2000. However it can be easily adapted to windows xp!

LINK

rickste_r

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Oct 20th, 2006

Re: Compile Java

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.

Barbank

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Oct 20th, 2006

Re: Compile Java

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

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Oct 20th, 2006

Re: Compile Java

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!!

Barbank

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Oct 20th, 2006

Re: Compile Java

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

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Oct 20th, 2006

Re: Compile Java

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

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

Barbank

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Oct 20th, 2006

Re: Compile Java

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

JaksLax

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Oct 20th, 2006

Re: Compile Java

Java Syntax (Toggle Plain Text)
/**
 * 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.
    }
}
/**
 * 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.
    }
}

Barbank

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