org.apache.commons.collections4.keyvalue

## Class TiedMapEntry<K,V>

- java.lang.Object
- - org.apache.commons.collections4.keyvalue.TiedMapEntry<K,V>

- All Implemented Interfaces:
    Serializable, Map.Entry<K,V>, KeyValue<K,V>

      public class TiedMapEntry<K,V>
      extends Object
      implements Map.Entry<K,V>, KeyValue<K,V>, Serializable

  A `Map.Entry` tied to a map underneath.

  This can be used to enable a map entry to make changes on the underlying map, however this will probably mess up any iterators.

  Since:
    3.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `TiedMapEntry(Map<K,V> map, K key)` Constructs a new entry with the given Map and key.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object obj)` Compares this `Map.Entry` with another `Map.Entry`.
    `K` | `getKey()` Gets the key of this entry
    `V` | `getValue()` Gets the value of this entry direct from the map.
    `int` | `hashCode()` Gets a hashCode compatible with the equals method.
    `V` | `setValue(V value)` Sets the value associated with the key direct onto the map.
    `String` | `toString()` Gets a string version of the 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

    - #### TiedMapEntry

          public TiedMapEntry(Map<K,V> map,
                              K key)

      Constructs a new entry with the given Map and key.
      Parameters:
        `map` - the map
        `key` - the key

  - ### Method Detail

    - #### getKey

          public K getKey()

      Gets the key of this entry
      Specified by:
        `getKey` in interface `Map.Entry<K,V>`
      Specified by:
        `getKey` in interface `KeyValue<K,V>`
      Returns:
        the key

    - #### getValue

          public V getValue()

      Gets the value of this entry direct from the map.
      Specified by:
        `getValue` in interface `Map.Entry<K,V>`
      Specified by:
        `getValue` in interface `KeyValue<K,V>`
      Returns:
        the value

    - #### setValue

          public V setValue(V value)

      Sets the value associated with the key direct onto the map.
      Specified by:
        `setValue` in interface `Map.Entry<K,V>`
      Parameters:
        `value` - the new value
      Returns:
        the old value
      Throws:
        `IllegalArgumentException` - if the value is set to this map entry

    - #### equals

          public boolean equals(Object obj)

      Compares this `Map.Entry` with another `Map.Entry`.

      Implemented per API documentation of `Map.Entry.equals(Object)`

      Specified by:
        `equals` in interface `Map.Entry<K,V>`
      Overrides:
        `equals` in class `Object`
      Parameters:
        `obj` - the object to compare to
      Returns:
        true if equal key and value

    - #### hashCode

          public int hashCode()

      Gets a hashCode compatible with the equals method.

      Implemented per API documentation of `Map.Entry.hashCode()`

      Specified by:
        `hashCode` in interface `Map.Entry<K,V>`
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a suitable hash code

    - #### toString

          public String toString()

      Gets a string version of the entry.
      Overrides:
        `toString` in class `Object`
      Returns:
        entry as a string

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