How to compare the contents of two different tables

hello. can somebody give me an idean on how to compare the contents of two different tables in mysql?
example, i have a table named Main List and a table named New List.
The contents of the New List should be compared to the contents of the
Main List, to check if they are equal. I don't have any idea how to manipulate
this data. Hoping for your help. Thanks.

it is better to comapre it using java.. try get the resultset first and store that in collections then comapre the two collections

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<REMOVED BY MODERATOR>
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