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I wonder why the Collection.addAll() method only accepts other Collections but not Iterables. Why is that?
Any similar method to do that for Iterables?
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java collection Java iterable interface The Collection interface extends Iterable interface, so all subtypes of Collection implement the Iterable interface. This interface stands to represent data-structures whose value can be traversed one by one. This is an important property.
'Iterator' is an interface which belongs to collection framework. It allows us to traverse the collection, access the data element and remove the data elements of the collection.
Presumably because the Collection interface was introduced in Java 1.2 whereas Iterable appeared only in 1.5, and changing the interface would break all existing implementations.
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