In what cases is it recommended to use the Comparator interface for comparing objects?

The Comparator interface in Java is recommended to be used when you need to define the sorting order of objects, but the class of the objects does not implement the Comparable interface or when multiple comparison options are needed for the same class.

Examples of using Comparator:

• Sorting by different criteria (for example, first by name, then by age).
• When it is not possible or undesirable to modify the original class to implement Comparable.
• For dynamically setting the sorting order at runtime.

Example of using Comparator:

List<Person> people = ...;
// Sorting by age
people.sort(Comparator.comparingInt(Person::getAge));