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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.util.Map

Map
public interface Map (Code)
Map has a set of keys, each key is mapped to a single value.

Inner Class :public static interface Entry



Method Summary
public  voidclear()
     Removes all elements from this Map, leaving it empty.
public  booleancontainsKey(Object key)
     Searches this Map for the specified key.
public  booleancontainsValue(Object value)
     Searches this Map for the specified value.
public  Set<Map.Entry<K, V>>entrySet()
     Returns a Set whose elements comprise all of the mappings that are to be found in this Map.
public  booleanequals(Object object)
     Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
Parameters:
  object - Object the object to compare with this object.
public  Vget(Object key)
     Answers the value of the mapping with the specified key.
public  inthashCode()
     Answers an integer hash code for the receiver.
public  booleanisEmpty()
     Answers if this Map has no elements, a size of zero.
public  Set<K>keySet()
     Answers a Set of the keys contained in this Map.
public  Vput(K key, V value)
     Maps the specified key to the specified value.
public  voidputAll(Map<? extends K, ? extends V> map)
     Copies every mapping in the specified Map to this Map.
public  Vremove(Object key)
     Removes a mapping with the specified key from this Map.
public  intsize()
     Answers the number of elements in this Map.
public  Collection<V>values()
     Returns all of the current Map values in a Collection.



Method Detail
clear
public void clear()(Code)
Removes all elements from this Map, leaving it empty.
exception:
  UnsupportedOperationException - when removing from this Map is not supported
See Also:   Map.isEmpty
See Also:   Map.size



containsKey
public boolean containsKey(Object key)(Code)
Searches this Map for the specified key.
Parameters:
  key - the object to search for true if key is a key of this Map, false otherwise



containsValue
public boolean containsValue(Object value)(Code)
Searches this Map for the specified value.
Parameters:
  value - the object to search for true if value is a value of this Map, falseotherwise



entrySet
public Set<Map.Entry<K, V>> entrySet()(Code)
Returns a Set whose elements comprise all of the mappings that are to be found in this Map. Information on each of the mappings is encapsulated in a separate Map.Entry instance. As the Set is backed by this Map, users should be aware that changes in one will be immediately visible in the other. a Set of the mappings



equals
public boolean equals(Object object)(Code)
Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
Parameters:
  object - Object the object to compare with this object. boolean true if the object is the same as thisobject false if it is different from this object.
See Also:   Map.hashCode



get
public V get(Object key)(Code)
Answers the value of the mapping with the specified key.
Parameters:
  key - the key the value of the mapping with the specified key



hashCode
public int hashCode()(Code)
Answers an integer hash code for the receiver. Objects which are equal answer the same value for this method. the receiver's hash
See Also:   Map.equals



isEmpty
public boolean isEmpty()(Code)
Answers if this Map has no elements, a size of zero. true if this Map has no elements, false otherwise
See Also:   Map.size



keySet
public Set<K> keySet()(Code)
Answers a Set of the keys contained in this Map. The set is backed by this Map so changes to one are reflected by the other. The set does not support adding. a Set of the keys



put
public V put(K key, V value)(Code)
Maps the specified key to the specified value.
Parameters:
  key - the key
Parameters:
  value - the value the value of any previous mapping with the specified key or nullif there was no mapping
exception:
  UnsupportedOperationException - when adding to this Map is not supported
exception:
  ClassCastException - when the class of the key or value is inappropriate forthis Map
exception:
  IllegalArgumentException - when the key or value cannot be added to this Map
exception:
  NullPointerException - when the key or value is null and this Map does notsupport null keys or values



putAll
public void putAll(Map<? extends K, ? extends V> map)(Code)
Copies every mapping in the specified Map to this Map.
Parameters:
  map - the Map to copy mappings from
exception:
  UnsupportedOperationException - when adding to this Map is not supported
exception:
  ClassCastException - when the class of a key or value is inappropriate for thisMap
exception:
  IllegalArgumentException - when a key or value cannot be added to this Map
exception:
  NullPointerException - when a key or value is null and this Map does not supportnull keys or values



remove
public V remove(Object key)(Code)
Removes a mapping with the specified key from this Map.
Parameters:
  key - the key of the mapping to remove the value of the removed mapping or null if key is not a key inthis Map
exception:
  UnsupportedOperationException - when removing from this Map is not supported



size
public int size()(Code)
Answers the number of elements in this Map. the number of elements in this Map



values
public Collection<V> values()(Code)
Returns all of the current Map values in a Collection. As the returned Collection is backed by this Map, users should be aware that changes in one will be immediately visible in the other. a Collection of the values



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