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java.lang.Objectjava.util.AbstractMap.SimpleEntry<K,V>
public static class AbstractMap.SimpleEntry<K,V>
A class which implements Map.Entry. It is shared by HashMap, TreeMap, Hashtable, and Collections. It is not specified by the JDK, but makes life much easier.
Constructor Summary | |
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AbstractMap.SimpleEntry(K newKey,
V newValue)
Basic constructor initializes the fields. |
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AbstractMap.SimpleEntry(Map.Entry<? extends K,? extends V> entry)
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Method Summary | |
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boolean |
equals(Object o)
Compares the specified object with this entry. |
K |
getKey()
Get the key corresponding to this entry. |
V |
getValue()
Get the value corresponding to this entry. |
int |
hashCode()
Returns the hash code of the entry. |
V |
setValue(V newVal)
Replaces the value with the specified object. |
String |
toString()
This provides a string representation of the entry. |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public AbstractMap.SimpleEntry(K newKey, V newValue)
newKey
- the keynewValue
- the valuepublic AbstractMap.SimpleEntry(Map.Entry<? extends K,? extends V> entry)
Method Detail |
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public boolean equals(Object o)
(o instanceof Map.Entry) && (getKey() == null ? ((HashMap) o).getKey() == null : getKey().equals(((HashMap) o).getKey())) && (getValue() == null ? ((HashMap) o).getValue() == null : getValue().equals(((HashMap) o).getValue()))
equals
in interface Map.Entry<K,V>
equals
in class Object
o
- the object to compare
true
if it is equalObject.hashCode()
public K getKey()
getKey
in interface Map.Entry<K,V>
public V getValue()
getValue
in interface Map.Entry<K,V>
public int hashCode()
(getKey() == null ? 0 : getKey().hashCode()) ^ (getValue() == null ? 0 : getValue().hashCode())
hashCode
in interface Map.Entry<K,V>
hashCode
in class Object
Object.equals(Object)
,
System.identityHashCode(Object)
public V setValue(V newVal)
setValue
in interface Map.Entry<K,V>
newVal
- the new value to store
NullPointerException
- if the map forbids null values.
UnsupportedOperationException
- if the map doesn't support
put()
.
ClassCastException
- if the value is of a type unsupported
by the map.
IllegalArgumentException
- if something else about this
value prevents it being stored in the map.public String toString()
toString
in class Object
Object.getClass()
,
Object.hashCode()
,
Class.getName()
,
Integer.toHexString(int)
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