Java8 program to read data from file and displaying Statistics of data

 
Employees date of birth is stored in an file in the following format:

08/06/1984

29/5/1982

20/1/1989

17/5/1989

22nd October 1991

14th December 1991

20th February 1994

27th July 1990

26th Dec 1991

12th Nov 1990

19th Dec 1990

27th Dec 1989

Java8 IntSummaryStatistics class to calculate total employees, total age, and average age group of the organization.  

 import java.nio.file.Files;  
 import java.nio.file.Paths;  
 import java.time.LocalDate;  
 import java.util.IntSummaryStatistics;  
 import java.util.stream.Stream;  
 public class DemoExample {  
      public static void main(String... args) {  
           try (Stream<String> lines = Files.lines(Paths.get("demo"))) {  
                IntSummaryStatistics intstream = lines.sequential()  
                          .mapToInt(e -> LocalDate.now().getYear() - Integer.parseInt(e.substring(e.trim().length() - 4)))  
                          .summaryStatistics();  
                long total_age = intstream.getSum();  
                long total_count = intstream.getCount();  
                double avg_age = intstream.getAverage();  
                System.out.println("Total employees :" + total_count);  
                System.out.println("Total age is :" + total_age);  
                System.out.println("Average age is :" + avg_age);  
           } catch (Exception e) {  
                e.printStackTrace();  
           }  
      }  
 }