All Implemented Interfaces:

Serializable, Map.Entry<K,V>

Enclosing class:

AbstractMap<K,V>

public static class AbstractMap.SimpleImmutableEntry<K,V>
extends Object
implements Map.Entry<K,V>, Serializable 

Since:

1.6

See Also:

Serialized Form

• Constructor Summary

  Constructors

  Constructor	Description
  SimpleImmutableEntry (K key, V value)	Creates an entry representing a mapping from the specified key to the specified value.
  SimpleImmutableEntry (Map.Entry<? extends K,? extends V> entry)	Creates an entry representing the same mapping as the specified entry.

• Method Summary

  All Methods

  Modifier and Type	Method	Description
  boolean	equals (Object o)	Compares the specified object with this entry for equality.
  K	getKey ()	Returns the key corresponding to this entry.
  V	getValue ()	Returns the value corresponding to this entry.
  int	hashCode ()	Returns the hash code value for this map entry.
  V	setValue (V value)	Replaces the value corresponding to this entry with the specified value (optional operation).
  String	toString ()	Returns a String representation of this map entry.

  • Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

  • Methods inherited from interface java.util.Map.Entry

    comparingByKey, comparingByKey, comparingByValue, comparingByValue

• Constructor Detail

  • SimpleImmutableEntry

    public SimpleImmutableEntry(K key,
     V value)

    Creates an entry representing a mapping from the specified key to the specified value.

    Parameters:

    key - the key represented by this entry

    value - the value represented by this entry

  • SimpleImmutableEntry

    public SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)

    Creates an entry representing the same mapping as the specified entry.

    Parameters:

    entry - the entry to copy

• Method Detail

  • getKey

    public K getKey()

    Returns the key corresponding to this entry.

    Specified by:

    getKey in interface Map.Entry<K,V>

    Returns:

    the key corresponding to this entry

  • getValue

    public V getValue()

    Returns the value corresponding to this entry.

    Specified by:

    getValue in interface Map.Entry<K,V>

    Returns:

    the value corresponding to this entry

  • setValue

    public V setValue(V value)

    Replaces the value corresponding to this entry with the specified value (optional operation). This implementation simply throws UnsupportedOperationException, as this class implements an immutable map entry.

    Specified by:

    setValue in interface Map.Entry<K,V>

    Parameters:

    value - new value to be stored in this entry

    Returns:

    (Does not return)

    Throws:

    UnsupportedOperationException - always

  • equals

    public boolean equals(Object o)

    Compares the specified object with this entry for equality. Returns true if the given object is also a map entry and the two entries represent the same mapping. More formally, two entries e1 and e2 represent 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 the equals method works properly across different implementations of the Map.Entry interface.

    Specified by:

    equals in interface Map.Entry<K,V>

    Overrides:

    equals in class Object

    Parameters:

    o - object to be compared for equality with this map entry

    Returns:

    true if the specified object is equal to this map entry

    See Also:

    hashCode()

  • hashCode

    public int hashCode()

    Returns the hash code value for this map entry. The hash code of a map entry e is defined to be:

     (e.getKey()==null ? 0 : e.getKey().hashCode()) ^
     (e.getValue()==null ? 0 : e.getValue().hashCode())

    This ensures that e1.equals(e2) implies that e1.hashCode()==e2.hashCode() for any two Entries e1 and e2, as required by the general contract of Object.hashCode().

    Specified by:

    hashCode in interface Map.Entry<K,V>

    Overrides:

    hashCode in class Object

    Returns:

    the hash code value for this map entry

    See Also:

    equals(java.lang.Object)

  • 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.

    Overrides:

    toString in class Object

    Returns:

    a String representation of this map entry