Java 8 Stream Filter and Collect Example

In this article we are going to see about Java 8 Stream filter() and collect()  example program.

StreamFilter.java

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01.package com.javatutorialcorner.java8;

02. 

03.import java.util.ArrayList;

04.import java.util.List;

05.import java.util.stream.Collectors;

06. 

07.public class StreamFilter {

08. 

09. public static void main(String[] args) {

10.  List<string> batsmanRanking = new ArrayList<>();

11.  batsmanRanking.add("Virat Kohli");

12.  batsmanRanking.add("AB de Villiers");

13.  batsmanRanking.add("David Warner");

14.  batsmanRanking.add("Joe Root");

15.  batsmanRanking.add("Kane Williamson");

16.  batsmanRanking.add("Quinton de Kock");

17.  batsmanRanking.add("Faf du Plessis");

18.  batsmanRanking.add("Babar Azam");

19.  batsmanRanking.add("Martin Guptill");

20.  batsmanRanking.add("Shikhar Dhawan");

21. 

22.  System.out.println("Java 7 forEach : ICC One day Batsman Ranking");

23. 

24.  // Java 7 for each

25.  for (String batsman : batsmanRanking) {

26.   System.out.println("Name : " + batsman);

27. 

28.  }

29.   

30.  // Java 7 for each

31.  List<string> superBatsman = new ArrayList<>();

32.  for (String batsman : batsmanRanking) {

33.   if ("AB de Villiers".equals(batsman)) {

34.    superBatsman.add(batsman);

35.   }

36. 

37.  }

38. 

39.  for (String batsman : superBatsman) {

40.   System.out.println("Super Batsman : " + batsman);

41. 

42.  }

43.   

44.  System.out.println("Java 8 Stream Filter & Collect");

45.   List<string> java8SuperBatsman = batsmanRanking.stream()                // convert list to stream

46.                 .filter(batsman -> "AB de Villiers".equals(batsman))     // equals check AB de Villiers

47.                 .collect(Collectors.toList());              // collect the output and convert streams to a List

48. 

49.   java8SuperBatsman.forEach(System.out::println);   

50.    

51.   System.out.println("Java 8 Stream Filter & Collect");

52.   List<string> topBatsmans = batsmanRanking.stream()                // convert list to stream

53.                 .filter(batsman -> ! "AB de Villiers".equals(batsman))     // not equals check AB de Villiers

54.                 .collect(Collectors.toList());              // collect the output and convert streams to a List

55. 

56.   topBatsmans.forEach(System.out::println);  

57. }

58. 

59.}</string></string></string></string>

Output

Java 7 forEach : ICC One day Batsman Ranking
Name : Virat Kohli
Name : AB de Villiers
Name : David Warner
Name : Joe Root
Name : Kane Williamson
Name : Quinton de Kock
Name : Faf du Plessis
Name : Babar Azam
Name : Martin Guptill
Name : Shikhar Dhawan
Super Batsman : AB de Villiers
Java 8 Stream Filter & Collect
AB de Villiers
Java 8 Stream Filter & Collect
Virat Kohli
David Warner
Joe Root
Kane Williamson
Quinton de Kock
Faf du Plessis
Babar Azam
Martin Guptill
Shikhar Dhawan

Java Java 8 6/22/2017 06:54:00 pm