Turn a for into lambda with variable interaction

Question

How to turn the section below into a Lambda code?

The idea is to multiply the maxScore for i so that at each interaction it increases the number, only for the first 5 results.

    for(int i=0;i<5;i++){
        list.get(i).setScore(maxScore + (0.01d * i));
    }

The idea of the code is more or less this:

    List<HashObject> list = createObjects(10);
    Double maxScore = 0.9d;

    for(int i=0;i<5;i++){
        list.get(i).setScore(maxScore + (0.01d * i));
    }

Hashobject class:

    public class HashObject {
        private Integer id;
        private String name;
        private Double score;

        /* Getters and Setters */
    }

Answer 1

Sirs,

I solved the problem with the command:

IntStream.range(0,5).forEach(p -> list.get(p).setScore(0.01d * (double)p));

Where the command Intstream.range(0,5) loops, foreach I walked the loop and the p is the interaction of the loop (the i in the case of).

Answer 2

Oops, so you take the elements from your list and apply a foreach:

Example:

  List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7);

  list.forEach(n -> System.out.println(n));

Anything look at that link: http://www.devmedia.com.br/como-usar-funcoes-lambda-em-java/32826