public class SizeAreaComparator extends Object implements Comparator<Size>
Size
objects by the area.
This comparator totally orders by rectangle area. Tie-breaks on width.
Constructor and Description |
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SizeAreaComparator() |
Modifier and Type | Method and Description |
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int |
compare(Size size,
Size size2)
Compares its two arguments for order.
|
static Size |
findLargestByArea(List<Size> sizes)
Get the largest
Size from the list by comparing each size's area
by each other using SizeAreaComparator . |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong
public int compare(Size size, Size size2)
In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive.
The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."
compare
in interface Comparator<Size>
size
- the first object to be compared.size2
- the second object to be compared.public static Size findLargestByArea(List<Size> sizes)
Size
from the list by comparing each size's area
by each other using SizeAreaComparator
.sizes
- a non-null
list of non-null
sizesnull
sizeNullPointerException
- if sizes
or any elements in it were null