On the other hand, the second alternative accepts 2 points (which are the required arguments of the pare() method) and determines the relative order of these 2 points. In other words, the first alternative uses a Function that needs just one point since this function tells paring how to transform each of the 2 points. In Java, the sort() method can be customized to perform sorting in reverse order using the Comparator interface. This could be done manually but I want to code it via inbuilt sorting using comparators. Viewed 536 times 1 Sort a character array lexicographically with an additional condition that all cs comes before all bs. It uses Double's compareTo() instead (assuming the coordinates of your points are Double or double). Sort character array using java comparator. Override the compareTo method in the Triplet class. The Comparable interface contains the method compareTo to decide the order of the elements. ![]() Using paring() is safer, since it compares the sums of squares of the two points without computing their difference. In this method, we are going to implement the Comparable interface from java.lang Package in the Triplet class. We can use paring () and pass a function that extracts the field to use. That's exactly what your second Comparator - (p1, p2) -> p1*p1 + p1*p1 - p2*p2 - p2*p2 - does, Let’s suppose we have our Movie class and we want to sort our List by title. Then, when the Comparator needs to compare two points, it compares the sum of squares of the two points, which is almost equivalent to computing the difference of the sums of squares of the two points (it's not exactly equivalent, since comparing two numbers by computing their difference can produce wrong output in case of numeric overflow). When you are passing the function p -> p*p + p*p, you are converting each point to its sum of squares. it uses the Function you pass to it in order to transform each of the compared elements into a Comparable, and then uses the Comparable's compareTo method. ![]() (c1, c2) -> keyExtractor.apply(c1).compareTo(keyExtractor.apply(c2)) paring is implemented as follows: public static > Comparator comparing(
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