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So if we would have been allowed to create generic arrays, because of type erasure we would not get array store exception even though both types are not related.To know more about Generics, read Java Generics Tutorial.I will keep on adding more questions on java collections framework as and when I found them, if you found it useful please share it with others too, it motivates me in writing more like these. This interface models the mathematical set abstraction and is used to represent sets, such as the deck of cards. Since generics type information gets erased at runtime by Type Erasure, the array store check would have been passed where it should have failed. As stated HashMap uses equals() and hashcode() functions to find the value in the map. Both these classes have overloaded sort() methods for natural sorting (using Comparable) or sorting based on criteria (using Comparator). Previous page: Beginning of Tutorial Next page: Introduction to Collections . I guess in HashMap only null keys are supported and not null values.Reply Pankaj saysAugust 13, 2016 at 10:35 pm For these, best way to confirm is write a simple program. Also immutable classes make sure that hashCode() and equals() will not change in future that will solve any issue with mutability. All of the elements in an enum set must come from a single enum type that is specified, explicitly or implicitly, when the set is created.