Java – Streams vs Collections vs Loops

public static void main(final String[] args) {
 
  List list = new ArrayList();
  Random rnd = new Random();
  for (int i = 0; i < 10; i++) { list.add(rnd.nextInt(10000)); } long t1 = System.currentTimeMillis(); long largestNumber = 0; for (Integer t : list) { if (t > largestNumber) {
      largestNumber = t;
    }
  }
 
  long t2 = System.currentTimeMillis();
  System.out.println("Max (loop) is " + largestNumber + " in " + (t2 - t1) + " ms.");
 
  long t3 = System.currentTimeMillis();
  OptionalInt max = list.stream().mapToInt(Integer::intValue).max();
 
  long t4 = System.currentTimeMillis();
  if (max.isPresent()) {
    System.out.println("Max (Stream) is " + max.getAsInt() + " in " + (t4 - t3) + " ms.");
  }
 
  long t5 = System.currentTimeMillis();
  int collMax = Collections.max(list);
  long t6 = System.currentTimeMillis();
 
  System.out.println("Max (Collections) is " + collMax + " in " + (t6 - t5) + " ms.");
}