Class AbstractMap.SimpleEntry<K,V>
java.lang.Object
java.util.AbstractMap.SimpleEntry<K,V>
- Type Parameters:
K- the type of keyV- the type of the value
- All Implemented Interfaces:
Serializable,Map.Entry<K,V>
- Enclosing class:
AbstractMap<K,V>
public static class AbstractMap.SimpleEntry<K,V>
extends Object
implements Map.Entry<K,V>, Serializable
An Entry maintaining a key and a value. The value may be
changed using the
setValue method. Instances of
this class are not associated with any map nor with any
map's entry-set view.- API Note:
- This class facilitates the process of building custom map
implementations. For example, it may be convenient to return
arrays of
SimpleEntryinstances in methodMap.entrySet().toArray. - Since:
- 1.6
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptionSimpleEntry(Map.Entry<? extends K, ? extends V> entry) Creates an entry representing the same mapping as the specified entry.SimpleEntry(K key, V value) Creates an entry representing a mapping from the specified key to the specified value. -
Method Summary
Modifier and TypeMethodDescriptionbooleanCompares the specified object with this entry for equality.getKey()Returns the key corresponding to this entry.getValue()Returns the value corresponding to this entry.inthashCode()Returns the hash code value for this map entry.Replaces the value corresponding to this entry with the specified value.toString()Returns a String representation of this map entry.
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Constructor Details
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SimpleEntry
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SimpleEntry
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Method Details
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getKey
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getValue
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setValue
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equals
Compares the specified object with this entry for equality. Returnstrueif the given object is also a map entry and the two entries represent the same mapping. More formally, two entriese1ande2represent the same mapping if(e1.getKey()==null ? e2.getKey()==null : e1.getKey().equals(e2.getKey())) && (e1.getValue()==null ? e2.getValue()==null : e1.getValue().equals(e2.getValue()))This ensures that theequalsmethod works properly across different implementations of theMap.Entryinterface. -
hashCode
public int hashCode()Returns the hash code value for this map entry. The hash code of a map entryeis defined to be:(e.getKey()==null ? 0 : e.getKey().hashCode()) ^ (e.getValue()==null ? 0 : e.getValue().hashCode())
This ensures thate1.equals(e2)implies thate1.hashCode()==e2.hashCode()for any two Entriese1ande2, as required by the general contract ofObject.hashCode(). -
toString
Returns a String representation of this map entry. This implementation returns the string representation of this entry's key followed by the equals character ("=") followed by the string representation of this entry's value.
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