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2 Public classes in one file

 
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If there are two public classes in one file
say

The compiler finds an error with the first line, why not the second line. Is it that the public class must be the one with the main method, or is it that if there are two it just picks the first of the two.
Thanks
Sam
 
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It only complains if the first public file isnt the same as the file name ie test.java of eg.
If its the same as the file name then the second public declaration is flagged with a compiler error
 
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