Java Interface does not accept method that passes ArrayList...Why?

Java Interface does not accept method that passes ArrayList...Why?
for example...
public interface Interface extends java.rmi.Remote
public ArrayList getSomething(String ID) throws java.rmi.RemoteException;
Why is this not acceptable?

Java Interface does not accept method that passes ArrayList...Why?for example...
ALSO:
You are not 'passing' ArrayList, you are returning it.
If you are 'passing' anything, it is String.
~David

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