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Thread: im trying to get started.

  1. Dec 25th, 2001, 08:25 PM #1
    flamewavetech
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    im trying to get started.

    i downloaded the compilers for java and i finnaly figured out how to compile a .java file. but i cant seem to be able to run the file. how do i do this? i have my .java file and .class file in my C drive do the paths to them are C:\Hello.java and C:\Hello.class

    i tried typing in "java Hello" but it gave me and error.
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  2. Dec 25th, 2001, 08:34 PM #2
    crptcblade
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    Re: im trying to get started.

    Originally posted by flamewavetech
    i tried typing in "java Hello" but it gave me and error.
    What error would that be?
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  3. Dec 25th, 2001, 08:43 PM #3
    flamewavetech
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    Exception in thread "main" java.lang.NoClassDefFoundError: Hello
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  4. Dec 25th, 2001, 08:46 PM #4
    crptcblade
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    and you were in c:\ when you tried to run it? Did you package it?
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  6. Dec 25th, 2001, 09:00 PM #5
    flamewavetech
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    what do u mean? i just went to run and typed in command and then typed in java Hello
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  7. Dec 25th, 2001, 09:05 PM #6
    crptcblade
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    well, if you don't know what packaging is, then its probably not the problem . But, as far as where you are in at the command line...if you have the .class file in c:\ and you are in c:\windows when you type in "java Hello", then it won't work. That's what I meant. It seems like a stupid mistake to make, but it happens sometimes.

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  8. Dec 26th, 2001, 07:14 PM #7
    Ahriman
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    the jvm can't find your .class file because you didn't specify the classpath (path of the directory where your class files are)

    type this instead

    java -classpath c:\ Hello
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  9. Dec 28th, 2001, 02:55 AM #8
    Dillinger4
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    Yeah flamewavetech you have to use either the -classpath comamand line switch ie........ C:\ java -classpath C:\MyClassDir; myProg or set the CLASSPATH environment variable in your autoexec.bat file. *~Note if you change your autoexec.bat file you have to reboot in order for the changes to take effect.
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  11. Dec 28th, 2001, 05:58 AM #9
    CaptainPinko
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    Originally posted by Dilenger4
    *~Note if you change your autoexec.bat file you have to reboot in order for the changes to take effect.
    nah, just call the autoexec again at the command line
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  12. Dec 28th, 2001, 10:18 AM #10
    Serge
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    NT/2000/XP don't have Autoexec.bat. You will have to use Environment tab from the System control applet (or press Windows Key + Pause)
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  13. Dec 28th, 2001, 10:48 AM #11
    BS
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    Remember to put a . (dot) after the last path in the classpath or Java can't see your current folder
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