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java.lang.Objectjava.util.AbstractMap<K,V>
java.util.HashMap<K,V>
K
- the type of the keys this map will containV
- the type of the values this map will containpublic class HashMap<K,V>
HashMap is an implementation of Map. All optional operations are supported, adding and removing. Keys and values can be any objects.
Constructor Summary | |
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HashMap()
Contructs a new empty instance of HashMap. |
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HashMap(int capacity)
Constructs a new instance of HashMap with the specified capacity. |
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HashMap(int capacity,
float loadFactor)
Constructs a new instance of HashMap with the specified capacity and load factor. |
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HashMap(Map<? extends K,? extends V> map)
Constructs a new instance of HashMap containing the mappings from the specified Map. |
Method Summary | |
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void |
clear()
Removes all mappings from this HashMap, leaving it empty. |
Object |
clone()
Answers a new HashMap with the same mappings and size as this HashMap. |
boolean |
containsKey(Object key)
Searches this HashMap for the specified key. |
boolean |
containsValue(Object value)
Searches this HashMap for the specified value. |
Set<Map.Entry<K,V>> |
entrySet()
Answers a Set of the mappings contained in this HashMap. |
V |
get(Object key)
Answers the value of the mapping with the specified key. |
boolean |
isEmpty()
Answers if this HashMap has no elements, a size of zero. |
Set<K> |
keySet()
Answers a Set of the keys contained in this HashMap. |
V |
put(K key,
V value)
Maps the specified key to the specified value. |
void |
putAll(Map<? extends K,? extends V> map)
Copies every mapping in the specified Map to this HashMap. |
V |
remove(Object key)
Removes a mapping with the specified key from this HashMap. |
int |
size()
Answers the number of mappings in this HashMap. |
Collection<V> |
values()
Answers a Collection of the values contained in this HashMap. |
Methods inherited from class java.util.AbstractMap |
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equals, hashCode, toString |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Map |
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equals, hashCode |
Constructor Detail |
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public HashMap()
public HashMap(int capacity)
capacity
- the initial capacity of this HashMap
IllegalArgumentException
- when the capacity is less than zeropublic HashMap(int capacity, float loadFactor)
capacity
- the initial capacityloadFactor
- the initial load factor
IllegalArgumentException
- when the capacity is less than zero
or the load factor is less or equal to zeropublic HashMap(Map<? extends K,? extends V> map)
map
- the mappings to addMethod Detail |
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public void clear()
clear
in interface Map<K,V>
clear
in class AbstractMap<K,V>
isEmpty()
,
size()
public Object clone()
clone
in class AbstractMap<K,V>
Cloneable
public boolean containsKey(Object key)
containsKey
in interface Map<K,V>
containsKey
in class AbstractMap<K,V>
key
- the object to search for
key
is a key of this HashMap, false otherwisepublic boolean containsValue(Object value)
containsValue
in interface Map<K,V>
containsValue
in class AbstractMap<K,V>
value
- the object to search for
value
is a value of this HashMap, false otherwisepublic Set<Map.Entry<K,V>> entrySet()
entrySet
in interface Map<K,V>
entrySet
in class AbstractMap<K,V>
public V get(Object key)
get
in interface Map<K,V>
get
in class AbstractMap<K,V>
key
- the key
public boolean isEmpty()
isEmpty
in interface Map<K,V>
isEmpty
in class AbstractMap<K,V>
size()
@SuppressWarnings(value="all") public Set<K> keySet()
keySet
in interface Map<K,V>
keySet
in class AbstractMap<K,V>
public V put(K key, V value)
put
in interface Map<K,V>
put
in class AbstractMap<K,V>
key
- the keyvalue
- the value
public void putAll(Map<? extends K,? extends V> map)
putAll
in interface Map<K,V>
putAll
in class AbstractMap<K,V>
map
- the Map to copy mappings frompublic V remove(Object key)
remove
in interface Map<K,V>
remove
in class AbstractMap<K,V>
key
- the key of the mapping to remove
public int size()
size
in interface Map<K,V>
size
in class AbstractMap<K,V>
@SuppressWarnings(value="all") public Collection<V> values()
values
in interface Map<K,V>
values
in class AbstractMap<K,V>
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