Spring 5.0 Cookbook

How to do it...

There are few ways to create Java stream objects from a typical collection or array data store. To use the Stream API, do the following steps:

1. Let us create an experimental service class, EmployeeStreamService, which consists of service methods dedicated to stream methods. This first method only shows how to extract streams from employeeDaoImpl:

@Service("employeeStreamService") 
public class EmployeeStreamService { 
   
  @Autowired 
  private EmployeeDao employeeDaoImpl; 
   
  public void getCollectionStreams(){ 
    Stream<Employee> serial = 
        employeeDaoImpl.getEmployees().stream(); 
    Stream<Employee> parallel = 
        employeeDaoImpl.getEmployees().parallelStream(); 
  } 
}

2. Next, add another method that illustrates how to extract stream data from an existing ...