| 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  | EnumMap<K extends Enum<K>,V>A specialized  Mapimplementation for use with enum type keys. | 
| class  | HashMap<K,V>Hash table based implementation of the Map interface. | 
| class  | IdentityHashMap<K,V>This class implements the Map interface with a hash table, using
 reference-equality in place of object-equality when comparing keys (and
 values). | 
| class  | LinkedHashMap<K,V>Hash table and linked list implementation of the Map interface,
 with predictable iteration order. | 
| class  | TreeMap<K,V>A Red-Black tree based  NavigableMapimplementation. | 
| class  | WeakHashMap<K,V>Hash table based implementation of the Map interface, with
 weak keys. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ConcurrentHashMap<K,V>A hash table supporting full concurrency of retrievals and
 high expected concurrency for updates. | 
| class  | ConcurrentSkipListMap<K,V>A scalable concurrent  ConcurrentNavigableMapimplementation. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | PrinterStateReasonsClass PrinterStateReasons is a printing attribute class, a set of
 enumeration values, that provides additional information about the
 printer's current state, i.e., information that augments the value of the
 printer's  PrinterStateattribute. | 
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