Pls help...i'm very, very new 2 this...

hi,
ok...i've got 2 questions :
1. if i get any sort of warning msg when compiling...does that mean i can still run the program, or are there certain exceptions?
2. what on earth does this mean?
Exception in thread "main" java.lang.NoClassDefFoundError filename
any help would be greatlt appreciated...
thanks

1. if i get any sort of warning msg when
compiling...does that mean i can still run the
program, or are there certain exceptions?
I don't have a definitive answer. If the compiler generates a new .class file, then you can run it. If you get a "... uses a deprecated method" message, it produces a file. I don't know of any other message that I've seen where a new file has been produced.
2. what on earth does this mean?
Exception in thread "main"
java.lang.NoClassDefFoundError filename
You entered a command like "java filename" and the jvm could not find a CLASS named filename. (The argument to the java command is the case-sensitive CLASS NAME not a file name.) The jvm searches thru the directories in the system Classpath setting to find a class. So, either no class named filename exists or it exists some place where the jvm isn't looking.

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