Compares the specified object with this entry for equality.

  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.
Returns: {@code true} if the specified object is equal to this map entry
Parameters:
- o - object to be compared for equality with this map entry
See Also: AbstractMap.SimpleEntry.hashCode(),

  Returns the key corresponding to this entry.

  Returns the key corresponding to this entry.
Returns: the key corresponding to this entry

  Returns the value corresponding to this entry.

  Returns the value corresponding to this entry.
Returns: the value corresponding to this entry

  Returns the hash code value for this map entry.

  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().
Returns: the hash code value for this map entry
See Also: AbstractMap.SimpleEntry.equals(java.lang.Object),

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

  Replaces the value corresponding to this entry with the specified
value.
Returns: the old value corresponding to the entry
Parameters:
- value - new value to be stored in this entry

  Returns a String representation of this map entry.

  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.
Returns: a String representation of this map entry