Returns true if this collection contains all of the elements in the specified collection.

Parameters:

c

collection to be checked for containment in this collection

Returns:  true if this collection contains all of the elements in the specified collection

Exceptions:

ClassCastException		if the types of one or more elements in the specified collection are incompatible with this collection (optional)
NullPointerException		if the specified collection contains one or more null elements and this collection does not permit null elements (optional), or if the specified collection is null.

See also:
contains(Object)