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

You don't have any terminal operation consuming your stream. So nothing happens. map() is an intermediate operation, which is not supposed to have side effects. What your code should be is

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