compact1, compact2, compact3
java.util
Class AbstractMap.SimpleEntry<K,V>
- java.lang.Object
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- java.util.AbstractMap.SimpleEntry<K,V>
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- 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. This class facilitates the process of building custom map implementations. For example, it may be convenient to return arrays of SimpleEntry instances in method Map.entrySet().toArray.- Since:
- 1.6
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor and Description SimpleEntry(K key, V value)Creates an entry representing a mapping from the specified key to the specified value.SimpleEntry(Map.Entry<? extends K,? extends V> entry)Creates an entry representing the same mapping as the specified entry.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description booleanequals(Object o)Compares the specified object with this entry for equality.KgetKey()Returns the key corresponding to this entry.VgetValue()Returns the value corresponding to this entry.inthashCode()Returns the hash code value for this map entry.VsetValue(V value)Replaces the value corresponding to this entry with the specified value.StringtoString()Returns a String representation of this map entry.-
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.util.Map.Entry
comparingByKey, comparingByKey, comparingByValue, comparingByValue
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Constructor Detail
SimpleEntry
public SimpleEntry(K key, V value)
Creates an entry representing a mapping from the specified key to the specified value.- Parameters:
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key- the key represented by this entry -
value- the value represented by this entry
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Method Detail
getKey
public K getKey()
Returns the key corresponding to this entry.
getValue
public V getValue()
Returns the value corresponding to this entry.
setValue
public V setValue(V value)
Replaces the value corresponding to this entry with the specified value.
equals
public boolean equals(Object o)
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
public String 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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