Java™ How To Program (Early Objects), Tenth Edition

Section 17.6.3 Sorting Employees By Multiple Fields

• To sort objects by two fields, you create a Comparator that uses two Functions. First you call Comparator method comparing to create a Comparator with the first Function. On the resulting Comparator, you call method thenComparing with the second Function. The resulting Comparator compares objects using the first Function then, for objects that are equal, compares them by the second Function.