Programming Forums > Application Development > Java

Prm753 · Nov 8th, 2005, 12:16 PM

Hello all.

As you might have seen from the other post, I have decided to learn Java.
I downloaded jEdit, found a tutorial from Sun, typed in my code:

(Toggle Plain Text)

class HelloWorldApp 
{
    public static void main(String[] args) 
    {
        System.out.println("Hello World!"); //Display the string.
    }
}

and of course there is an error:

java.lang.NoClassDefFoundError: helloworld
Exception in thread "main" Process java exited with code 1

This is compiling with the -java setting on the compiler.
Windows can't find the -javac setting.

Can someone tell me what I'm not doing in the compiler to make this work?
I'm almost certain the code is correct.

Thanks.

andro · Nov 8th, 2005, 12:19 PM

To compile it, at the command line type this:
javac HelloWorldApp.java

To run it:
java HelloWorldApp

If you get a "command not recognized" or something similiar for javac you probably haven't installed the JDK yet. Go get it from sun's website

Polyphemus_ · Nov 8th, 2005, 12:20 PM

I've noticed several mistakes.. To start, you do need javac to compile. Secondly, the filename of your sourcefile has to be equal to the name of the class it contains.
You have to install the JDK (Java Development Kit) to get javac.

Prm753 · Nov 8th, 2005, 12:29 PM

Aha, I see now. I will download the JDK sometime, but DSL lite only gets 30kb a sec and a 50 mb download will be 25 mins or so, and I don't feel like doing that now lol.

peace_of_mind · Nov 8th, 2005, 12:40 PM

Quote:

Originally Posted by Prm753

Aha, I see now. I will download the JDK sometime, but DSL lite only gets 30kb a sec and a 50 mb download will be 25 mins or so, and I don't feel like doing that now lol.

Drop to your knees and thank the good Lord above that you don't have dial-up, my good man. Always look on the bright side of life, (whistling) /montypython

Prm753 · Nov 8th, 2005, 1:07 PM

Well, my parents (after me bugging them for years) finally switched over to dsl lite from dial-up, so I know what it's like...

jamesdman · Nov 8th, 2005, 1:11 PM

OMG..Then you must not be to serious about learning it.I have dial-up and I downloaded it in my sleep and part of the next day.I'm also a novice but I guess I want to learn it a bit more then you.

Prm753 · Nov 8th, 2005, 1:15 PM

I'll probaly do it tonight, when my mom is done with the pc. I don't want to slow down my download and her surfing. I am serious about learning Java.

Lich · Nov 8th, 2005, 5:38 PM

Download java SDK/Netbeans from Sun and the Eclipse SDK. Get this and the rest is up to you.

crawforddavid2006 · Nov 8th, 2005, 6:22 PM

Try this

(Toggle Plain Text)

public class HelloWorld
{
    public static void main(String[] args)
    {
        System.out.println("Hello World!");
    }
}

Nov 8th, 2005, 12:16 PM	#1
Prm753 Professional Programmer Join Date: Oct 2005 Location: United States Posts: 447 Rep Power: 3	Beginning to lean Java... Hello all. As you might have seen from the other post, I have decided to learn Java. I downloaded jEdit, found a tutorial from Sun, typed in my code: (Toggle Plain Text) class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); //Display the string. } } class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); //Display the string. } } and of course there is an error: java.lang.NoClassDefFoundError: helloworld Exception in thread "main" Process java exited with code 1 This is compiling with the -java setting on the compiler. Windows can't find the -javac setting. Can someone tell me what I'm not doing in the compiler to make this work? I'm almost certain the code is correct. Thanks. __________________ The world's first athletic computer geek! The home of PrProgramsStudios How not to post a question: <-- Please don't reply

Nov 8th, 2005, 12:29 PM	#4
Prm753 Professional Programmer Join Date: Oct 2005 Location: United States Posts: 447 Rep Power: 3	Aha, I see now. I will download the JDK sometime, but DSL lite only gets 30kb a sec and a 50 mb download will be 25 mins or so, and I don't feel like doing that now lol. __________________ The world's first athletic computer geek! The home of PrProgramsStudios How not to post a question: <-- Please don't reply

Nov 8th, 2005, 1:07 PM	#6
Prm753 Professional Programmer Join Date: Oct 2005 Location: United States Posts: 447 Rep Power: 3	Well, my parents (after me bugging them for years) finally switched over to dsl lite from dial-up, so I know what it's like... __________________ The world's first athletic computer geek! The home of PrProgramsStudios How not to post a question: <-- Please don't reply

Nov 8th, 2005, 1:15 PM	#8
Prm753 Professional Programmer Join Date: Oct 2005 Location: United States Posts: 447 Rep Power: 3	I'll probaly do it tonight, when my mom is done with the pc. I don't want to slow down my download and her surfing. I am serious about learning Java. __________________ The world's first athletic computer geek! The home of PrProgramsStudios How not to post a question: <-- Please don't reply

Nov 8th, 2005, 5:38 PM	#9
Lich Professional Programmer Join Date: May 2005 Location: Detroit Posts: 254 Rep Power: 4	Download java SDK/Netbeans from Sun and the Eclipse SDK. Get this and the rest is up to you. __________________ --John Cruz Web Developer www.cruzweb.net

Nov 8th, 2005, 12:19 PM	#2
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 294 Rep Power: 3	To compile it, at the command line type this: javac HelloWorldApp.java To run it: java HelloWorldApp If you get a "command not recognized" or something similiar for javac you probably haven't installed the JDK yet. Go get it from sun's website

Nov 8th, 2005, 12:20 PM	#3
Polyphemus_ Expert Programmer Join Date: Aug 2005 Location: Rotterdam, the Netherlands Posts: 942 Rep Power: 4	I've noticed several mistakes.. To start, you do need javac to compile. Secondly, the filename of your sourcefile has to be equal to the name of the class it contains. You have to install the JDK (Java Development Kit) to get javac.

Nov 8th, 2005, 1:11 PM	#7
jamesdman Newbie Join Date: Apr 2005 Location: NC,USA Posts: 17 Rep Power: 0	OMG..Then you must not be to serious about learning it.I have dial-up and I downloaded it in my sleep and part of the next day.I'm also a novice but I guess I want to learn it a bit more then you.

Nov 8th, 2005, 6:22 PM	#10
crawforddavid2006 Expert Programmer Join Date: Apr 2005 Location: Not sure yet Posts: 579 Rep Power: 0	Try this (Toggle Plain Text) public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } }

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Programming Forums > Application Development > Java

Beginning to lean Java...