Java Comparator interface is used to sort an array or list of objects based on a custom order. Custom ordering of elements is imposed by implementing Comparator.compare() method in the objects.

Java Comparator interface does the total ordering of the objects which may not have a natural ordering. For example, for a list of student objects, the natural order may be ordered by student id.

But in real-life applications, we may want to sort the list of a student by their first name, date of birth or simply any other such criteria. In such conditions, we need to use the Comparator interface.
Java Comparator Interface
Comparator interface in Java is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of two different classes.

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