public interface DoubleComparator
double
values.
This is a @FunctionalInterface
even though it isn't declared as one,
so that it can be used in Java 6+.
Modifier and Type | Method and Description |
---|---|
int |
compare(double d1,
double d2)
Compares
d1 and d2 . |
int compare(double d1, double d2)
d1
and d2
. Returns a negative value to indicate
that d1 < d2
, 0 to indicate that d1 == d2
, and a positive
value to indicate that d1 > d2
.
Implementations of this method must maintain the following invariants:
s(compare(x, y)) == -s(compare(y, x))
s(compare(x, y)) == s(compare(y, z))
→
s(compare(x, y)) == s(compare(x, z))
(transitivity)
compare(x, y) == 0
→
s(compare(x, z)) == s(compare(y, z))
∀ z
where s(x)
is defined as follows:
x < 0
: -1
x == 0
: 0
x > 0
: 1
Double.NEGATIVE_INFINITY
, and Double.POSITIVE_INFINITY
values. See Double.compareTo(Double)
for a valid example.d1
- the first double to compared2
- the second double to compared1
is less than, equal to, or greater than d2
,
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