Java comparator ascending

1. Does Comparator sort in ascending order?
2. How to use Comparator in Java for descending order?
3. How do you sort elements using a Comparator?

Does Comparator sort in ascending order?

In java, a Comparator is provided in java.

To sort an ArrayList using Comparator override the compare() method provided by the comparator interface. Override the compare() method in such a way that it will reorder an ArrayList in descending order instead of ascending order.

How to use Comparator in Java for descending order?

In order to sort ArrayList in Descending order using Comparator, we need to use the Collections. reverseOrder() method which returns a comparator which gives the reverse of the natural ordering on a collection of objects that implement the Comparable interface.

How do you sort elements using a Comparator?

We can simply implement Comparator without affecting the original User-defined class. To sort an ArrayList using Comparator we need to override the compare() method provided by comparator interface. After rewriting the compare() method we need to call collections. sort() method like below.