Oct 7, 2015 · If you want to reverse the ordering of an existing comparator, you can use Comparator.reversed(). Sample code: .sorted(Comparator.reverseOrder()); . // stream is now [5, 4, 2, 1] .sorted(Comparator.comparingInt(String::length).reversed()); . // stream is now [test, foo, a], sorted by descending length.

Feb 5, 2021 · The reversed() method of Comparator Interface in Java returns a comparator that imposes the reverse ordering of this comparator. If you use sort method of the array and passes this comparator after applying the reversed method then it will sort the array in reverse order. Syntax: default Comparator<T> reversed() Parameters: This method accepts ...

Apr 12, 2023 · The reverseOrder() method of Comparator Interface in Java returns a comparator that use to compare Comparable objects in reverse of natural order. The returned comparator by this method is serializable and throws NullPointerException when comparing null.

Jun 25, 2014 · Using a comparator would be the correct approach here in order to avoid the overhead of reversing an array. If the classes you are comparing implement Comparable you can just reverse the order of the comparison. obj2.compareTo(obj1). A way to visualize this is to think of the two objects as integers and compareTo as subtracting them.

Sep 13, 2010 · I need to sort an array of ints using a custom comparator, but Java's library doesn't provide a sort function for ints with comparators (comparators can be used only with objects). Is there any easy way to do this?

Jan 10, 2023 · The reverseOrder() method of Comparator Interface in Java returns a comparator that use to compare Comparable objects in reverse of natural order. The returned comparator by this method is serializable and throws NullPointerException when comparing null. Syntax: static <T extends Comparable<T

Dec 7, 2021 · In this tutorial, We'll learn how to use a comparator to sort the collection in reverse order. In Java 8, Comparator interface is added with the reverse () method to reverse the collection using the existing comparator instead of creating another custom comparator.

Jan 25, 2025 · The Comparator.reverseOrder() method in the java.util.Comparator class is a simple and effective tool for creating a comparator that sorts input in reverse (descending) order. It's...

May 1, 2021 · We can use static Comparator.reverseOrder() that returns a comparator that compares objects in reverse order. It imposes the reverse of the natural ordering. Usage: The above code will throw a NullPointerException if the specified array contains any null value. Java provides two methods to handle nulls: 1. Using nullsFirst() 2. Using nullsLast() 2.

Apr 14, 2021 · 4. Sorting an array into reverse order. To sort an array of objects into the reverse of natural ordering of its elements, we can use this syntax: Arrays.sort(array, Collections.reverseOrder());