kiwi.util.Comparator

Comparator is a comparison function, which imposes a total ordering onsome collection of objects. Comparators can be passed to a sort method such as Collections.sort, Arrays.sort(Object[],Comparator) etc.

If you are looking for example code on how to sort an ArrayList using a comparator then visit the following link
https://github.com/nsiatras/kiwi/wiki/kiwi.util.ArrayList#example---how-to-sort-an-arraylist-holding-standard-type-values

How to sort an Array using a Comparator

The following example will sort an Array holding 10 random double values.

#include once "kiwi\kiwi.bi"

' Initialize a new Array for Double Values
Dim values(0 to 9) as Double

' Add 10 Random double values to myArrayList
for i as Integer = 0 to 9
	values(i) = Math.random()
next i 

print "Array Elements Before Sort:"
for i as Integer = 0 to ubound(values)
	print "Element " & i &" = " & values(i)
next

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' Define a comparator Type
MACRO_DefineComparator(Double)
Type myComparator extends Comparator(Double)
	declare function compare(a as Double, b as Double) as Integer
End Type

function myComparator.compare(a as Double, b as Double) as Integer
	return iif(a>=b, 1, -1) ' Ascending
	'return iif(a<=b , 1, -1) 'Descending
end function
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' Initialize a comparator and use it to sort the array
Dim c as myComparator
c.quickSort(values(),0, ubound(values))
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print ""
print "Array Elements After Sort:"
for i as Integer = 0 to ubound(values)
	print "Element " & i &" = " & values(i)
next