Why does Java8 Stream generate nothing?

Question

import java.util.Comparator;
import java.util.PriorityQueue;


public class TestPQ {
    public static void main(String[] args){
        Comparator com         


        

Answer 1

The map() method itself is intermediate and does not enforce the consumption of a Stream so it's a very bad idea to put side effects there.

In this case, you should use the dedicated forEach() method:

queue.stream()
  .forEach(s -> System.out.println("queue: " + s));