Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions. Programmers frequently need to ...

The goal of this exercise is to help you understand the usage of custom comparators in Java. You will build upon the previous exercise with the Book class and create custom comparators to sort books ...

Comparable affects the original class, i.e., the actual class is modified. Comparator doesn't affect the original class, i.e., the actual class is not modified. Comparable provides compareTo() method ...

It holds a number called 'id'. Use getId() to retrieve that value. Note that as it stands, there is no way to set a value for 'id' (like a constructor or setter), so some additions would be needed for ...