| 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  
Map implementation 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  
NavigableMap implementation. | 
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  
ConcurrentNavigableMap implementation. | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
PrinterStateReasons
Class 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  
PrinterState attribute. | 
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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