How to iterate Enum values using java 8 stream api

Question

How get to only cspId in to one list of integer using Java stream API. Here in below example manually added enums in to list usually i will get from method calling place.

 public class Test {
        public static void main(String args[]){
            List<Board> numbers=new ArrayList<>();
            numbers.add(Board.MY_BOARD);
            numbers.add(Board.TEST_BOARD);
            List<Integer> list=new ArrayList<Integer>();//Here i want to get List<integer> using jaba stream api.
            System.out.println(list);               
            }
        }

Enum of Board

    enum Board{
          MY_BOARD(0, "My Dashboard"),
          WEB_BOARD(1, "web Dashboard"),
          TEST_BOARD(2, "web Dashboard")
    ;    
          private int cspId;
          private String name;

          Board(int id, String name) {
            this.cspId = id;
            this.name = name;
          }
          public int getId() {
                return cspId;
              }
              public String getName() {
                return name;
              }           
    }

... .stream().map(Board::getId).collect(toList())?

Andy Turner
– Andy Turner

2019-05-09 11:43:58 +00:00
Commented May 9, 2019 at 11:43 — Andy Turner
– Andy Turner, Commented May 9, 2019 at 11:43

lealceldeiro · Accepted Answer · 2019-05-10 06:56:32Z

8

Convert enum array to stream

Stream.of(Enum.values()).map....

for your example would be:

List<Integer> list= Stream.of(Board.values()).map(Board::getId).collect(Collectors.toList());

edited May 10, 2019 at 6:56

lealceldeiro

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answered May 9, 2019 at 11:47

no_answer

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1 Comment

user85421 Over a year ago

Board::getId - no parenthesis

Andy Turner · Accepted Answer · 2019-05-09 11:48:54Z

6

Then use the Stream API:

List<Integer> list = numbers.stream().map(Board::getId).collect(toList());

answered May 9, 2019 at 11:48

Andy Turner

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1 Comment

lealceldeiro Over a year ago

Just to elaborate a bit more and get rid of numbers completely, it could be List<Integer> list = Arrays.asList(Board.values()).stream().map(Board::getId).collect(Collectors.toList());

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