Package java.util

Interface Collection

The Collection interface is the root interface in the collection hierarchy. A collection represents a group of objects, known as its elements. It is not allowed to directly implement this interface. This interface is typically used to pass collection around and manibulate them where maximum generality is desierd.

All general-purpose Collection implementation classes which typically implement Collection indirectly through one of its subinterfaces should provide two "standard" constructors:

• a void (no arguments) constructor, which creates an empty collection, and
• a constructor with a single argument of type Collection, which creates a new collection with the same elements as its argument

In effect, the latter constructor allows the user to copy any collection, producing an equivalent collection of the desired implementation type.

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Public Methods