| Package | Description | 
|---|---|
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| 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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | EnumSet<E extends Enum<E>>A specialized  Setimplementation 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 predictable iteration order. | 
| class  | TreeSet<E>A  NavigableSetimplementation based on aTreeMap. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ConcurrentSkipListSet<E>A scalable concurrent  NavigableSetimplementation based on
 aConcurrentSkipListMap. | 
| class  | CopyOnWriteArraySet<E>A  Setthat uses an internalCopyOnWriteArrayListfor all of its operations. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | JobStateReasonsClass 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  JobStateattribute. | 
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