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NoSuchMethod:main error

Sami Devine
Ranch Hand

Joined: Jan 30, 2011
Posts: 44
I found the following eg in K & B SCJP 6



I have saved the file as Zoo.java. After javac Zoo.java both Zoo.class and Moo.class are created.
But for java Moo and java Zoo, I get "Exception in thread "main":NoSuchMethodError:main"
Does this indicate that I need to use the main method in Moo?
When is the main method not needed.
Thanks
Christophe Verré
Sheriff

Joined: Nov 24, 2005
Posts: 14687
    
  16

The main method is needed if you want to execute your program. The Moo does not have it, so you can't do "java Moo". In fact, none of your classes have a main method, so you're not expected to execute any of them. Just to compile them.


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