# Uses of Class
java.util.AbstractSet

Packages that use AbstractSet
Package
Description
java.util
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent
Utility classes commonly useful in concurrent programming.
javax.print.attribute.standard
Package `javax.print.attribute.standard` contains classes for specific printing attributes.

## Uses of AbstractSet in java.util

Subclasses of AbstractSet in java.util
Modifier and Type
Class
Description
`class`
`EnumSet<E extends Enum<E>>`
A specialized `Set` implementation for use with enum types.
`class`
`HashSet<E>`
This class implements the `Set` interface, backed by a hash table (actually a `HashMap` instance).
`class`
`LinkedHashSet<E>`
Hash table and linked list implementation of the `Set` interface, with well-defined encounter order.
`class`
`TreeSet<E>`
A `NavigableSet` implementation based on a `TreeMap`.

## Uses of AbstractSet in java.util.concurrent

Subclasses of AbstractSet in java.util.concurrent
Modifier and Type
Class
Description
`class`
`ConcurrentSkipListSet<E>`
A scalable concurrent `NavigableSet` implementation based on a `ConcurrentSkipListMap`.
`class`
`CopyOnWriteArraySet<E>`
A `Set` that uses an internal `CopyOnWriteArrayList` for all of its operations.

## Uses of AbstractSet in javax.print.attribute.standard

Subclasses of AbstractSet in javax.print.attribute.standard
Modifier and Type
Class
Description
`final class`
`JobStateReasons`
Class `JobStateReasons` is a printing attribute class, a set of enumeration values, that provides additional information about the job's current state, i.e., information that augments the value of the job's `JobState` attribute.