Java noob

AMMullan · 03-29-2004, 01:37 PM

Hey all

I've been using C for about 9 months and gotten reasonable confident in the language.. So i've now taken on Java - but when I go to compile the app it gives me an error saying I have an defined reference to main...

Here's the code:

Code:

class A {
  public static void main(String[] arguments) {
  String greeting = "Hello world!";
  System.out.println(greeting);
  }
}

But there is a main() in there... Heres the output when I compile:

[ammullan@daemon ammullan]$ gcj A.java
/usr/lib/gcc-lib/i386-redhat-linux/3.3.2/../../../crt1.o(.text+0x18): In function `_start':
: undefined reference to `main'
collect2: ld returned 1 exit status

Simple huh (boi and I thought I knew enuf to jump straight in)....

zombyLINUX · 03-29-2004, 01:44 PM

try making the class A public...

public class A {
stuff in class A...
}

AMMullan · 03-29-2004, 01:46 PM

I added public to class A but I still get the undefined main problem :-(

mpturner · 03-29-2004, 01:46 PM

that might do it...

if not use the '--main' command line argument (i think, check 'man gcj' for info)

AMMullan · 03-29-2004, 01:48 PM

Kewl, it worked using --main=A

Bit annoying that ya have to do that tho lol

Thanks for the help mpturner

zombyLINUX · 03-29-2004, 01:49 PM

Try compiling with javac...I just did and it worked fine.

Doesn't work also for gcj, maybe a bug in gcj or just have to use --main

AMMullan · 03-29-2004, 01:51 PM

Yeah I tried downloading the SDK last night but it crashed on me

Might try again tonight and then use that, although with gcj I can make binary files instead of class files

exodist · 03-29-2004, 02:52 PM

try changing class A to class main

AMMullan · 03-29-2004, 11:46 PM

No that still doesn't work properly, and it shouldn't matter what you call your class, just as long as you have public block called main