Which interface must a class implement to be sortable using `Collections.sort()`?

Question

Java Associate — Medium

Which interface must a class implement to be sortable using `Collections.sort()`?

Accepted Answer

To be sortable using `Collections.sort()`, a class must implement the Comparable interface. This interface defines a method `compareTo()` that allows objects to be compared for sorting. Implementing Comparable is necessary for the Collections.sort() method to work correctly.