Applying streams to collections

Java stream is currently used to transform, manipulate, consume, reduce, and/or transfer data without changing its data structure. Since a Stream object is not a data structure, it is designed to be generated by some of the most popular data structures in Java, namely arrays and collections, to perform a faster declarative way of data processing. It also has some utility methods that can generate data structures from the baseline.

Getting started

Open project ch06 again and add some services that will manipulate EmployeeDao data using stream methods.

How to do it...

The previous recipe provided with the process for how to generate the Stream objects from a source data structure. It is time to scrutinize and study the operations involved in stream objects:

1. Open again the class EmployeeStreamService in the package org.packt.functional.codes.service.impl and add this set of methods that initializes Employee, arrays and converts List<Employee> to Employee[] using...