Newbie: sorting an array of custom objects

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Hi,

As a project for learning Ruby, I'm writing a simple game. I have some 
simple objects that I would like to be able to sort 'automatically' in 
an array. In Java, I can implement the Comparable interface to make the 
Array.sort method do this for me. I'm sure I can do something similar or 
simpler i Ruby, I just don't know how. Can anyone help? An even more 
elegant solution would be to able to say to the array 'just put this 
object where it belongs', without really having to sort the whole array.

Thanks a lot!

Kind regards,
Einar