public boolean equals (Object obj)

Compares this object against the specified object. The result
is ` true`

if and only if the argument is not
` null`

and is a ` Double`

object that
represents a ` double`

that has the same value as the
` double`

represented by this object. For this
purpose, two ` double`

values are considered to be
the same if and only if the method `doubleToLongBits(double)`

returns the identical
` long`

value when applied to each.

Note that in most cases, for two instances of class
` Double`

, ` d1`

and ` d2`

, the
value of ` d1.equals(d2)`

is ` true`

if and
only if

```
```` d1.doubleValue() == d2.doubleValue()`

also has the value ` true`

. However, there are two
exceptions:

- If
`d1`

and`d2`

both represent`Double.NaN`

, then the`equals`

method returns`true`

, even though`Double.NaN==Double.NaN`

has the value`false`

. - If
`d1`

represents`+0.0`

while`d2`

represents`-0.0`

, or vice versa, the`equal`

test has the value`false`

, even though`+0.0==-0.0`

has the value`true`

.

`obj` | the object to compare with. |

` true`

if the objects are the same;
` false`

otherwise.

Diagram: Number