Possible Duplicate:
Interfaces in collections framework
What is the reason that all methods declarations from java.util.Collection interface are duplicated in java.util.List and java.util.Set, both of which extends java.util.Collection
Possible Duplicate:
Interfaces in collections framework
What is the reason that all methods declarations from java.util.Collection interface are duplicated in java.util.List and java.util.Set, both of which extends java.util.Collection