One of the more frequently encountered cases is the need to sort custom objects, such as Car, or Person type, for example. To do it, there are two options:
- Implement the Comparable interface. It has only one method, compareTo(T), which accepts an object of the same type and returns a negative integer, zero, or a positive integer if this object is less than, equal to, or greater than the specified object. Such an implementation is called a natural ordering because objects that implement the Comparable interface can be ordered by the method sort() of a collection. Many of the examples of the previous subsection demonstrated how it works for the objects of type String. Comparators are returned by the methods naturalOrder() ...
