CODEWITHSUNDEEP
javajava-8java-stream
Mary
Mary

Reputation: 1595

Java 8 stream a Collection and add only a specific field of the filtered values to a List of String

I have a collection of Account objects. I would like to stream through this collection and filter based on if the price is greater than 100. Then add only those account ids to a List

This is what I have using forEach

 List<String> filteredAcctList = new ArrayList<String>()
  forEach(Account acct:accountList){
      if(acct.getPrice() >100){
         filteredAcctList.add(acct.getAccountId())
       }
  }

I am trying to accomplish the same using the Java 8 stream but not sure how to create an ArrayList of just the account Ids.

Upvotes: 1

Views: 6492

Answers (1)

Erik Karlstrand
Erik Karlstrand

Reputation: 1537

You need to use map in order to "map" your Account items into String.

List<String> filteredAccList = 
    accountList
        .stream()
        .filter(a -> a.getPrice() > 100)
        .map(Account::getAccountId)
        .collect(Collectors.toList());

Upvotes: 3

Related Questions