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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/AbstractMap.SimpleEntry.html below:

AbstractMap.SimpleEntry (Java SE 21 & JDK 21)

Type Parameters:

K - the type of key

V - the type of the value

All Implemented Interfaces:

Serializable, Map.Entry<K,V>

Enclosing class:

AbstractMap<K,V>

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 SimpleEntry instances in method Map.entrySet().toArray.

Since:

1.6

See Also:

• Serialized Form

• Constructor Summary

  Constructors

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

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

• Method Summary

  boolean

  Compares the specified object with this entry for equality.

  Returns the key corresponding to this entry.

  Returns the value corresponding to this entry.

  int

  Returns the hash code value for this map entry.

  Replaces the value corresponding to this entry with the specified value.

  Returns a String representation of this map entry.

• Constructor Details
  • SimpleEntry public SimpleEntry(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

  • SimpleEntry public SimpleEntry(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 Details
  • 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

    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.

    Specified by:

    setValue in interface Map.Entry<K,V>

    Parameters:

    value - new value to be stored in this entry

    Returns:

    the old value corresponding to the entry

  • 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

    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

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