Java Comparator Interface Explained

The Java Comparator interface is used to compare the order of two objects. It defines a comparison method compare(Object obj1, Object obj2), which returns a negative number, zero, or positive number to indicate whether obj1 is less than, equal to, or greater than obj2. The Comparator interface can be used to sort objects in a collection, or for comparison operations when customizing the sorting order is needed. By implementing the Comparator interface, custom comparison rules can be provided for any class without having to modify the class itself.