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 ...

Comparators are used to compare two objects. In this challenge, you'll create a comparator and use it to sort an array. The Player class is provided for you in your editor. It has 2 fields: a name ...

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 ...