List types

Hi ,
i'm having a little problem with list types (As the title may suggest :)) ,
ihave class X which implements Interface Y , now i have a function that recieves a list of type X List<X> listX and another fucntion that recieves a List<Y> , i can't seem to pass the List<X> to the function which expectes a list of type Y
?? that's quite bizzare i think , unless i do something like that
List<Y> yyy ;
for (Y y : List<X>)
yyy.add(y)
and then i can pass yyy to the function , what's the logic in that ? i'm loosing the whole reason i use intefaces , any ideas how to solve this in a cleaner way ?

I think that this is a limitation of Java generics. For backwards compatability, java generics aren't covariant. So if
List<Integer> x = new ArrayList<Integer();x cannot be used in place of List<Number>. For more details, please see this reference:
http://www.ibm.com/developerworks/java/library/j-jtp01255.html
I don't know of any easy work-around.

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