Java Comparator

A Java Interface used to sort array order with custom sorting logic.

Example

//NameSorter.java
import java.util.Comparator;
public class NameSorter implements Comparator<Employee>
{
    @Override
    public int compare(Employee e1, Employee e2) {
        return e1.getName().compareToIgnoreCase( e2.getName() );
    }
}

Difference between Java Comparable

https://www.geeksforgeeks.org/java/comparable-vs-comparator-in-java/