Hi Azaman,
Here's from JDK1.3 API docs
quote:
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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 while d2 represents -0.0, or vice versa, the equal
test has the value false, even though .0==-0.0 has the value true. This allows hashtables to operate properly.
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- eric