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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		double sFF = 0;
  13. 		double cAT = 0;
  14.  
  15. 		for (int i = 0; i <= 100; ++i) {
  16. 		List<Integer> list = new Random(0).ints().limit(5).boxed().collect(Collectors.toList());
  17. 		long start = System.nanoTime();
  18. 		list.stream().collect(Collectors.collectingAndThen(
  19. 			Collectors.maxBy(Comparator.naturalOrder()),
  20. 			(Optional<Integer> n) -> n.orElse(0)));
  21. 		long end = System.nanoTime();
  22. 		cAT = (end - start) / 1e6;
  23.  
  24. 		start = System.nanoTime();
  25. 		list.stream().sorted().findFirst().get();
  26. 		end = System.nanoTime();
  27. 		sFF = (end - start) / 1e6;
  28.  
  29. 		if (i == 0 || i == 100) {
  30. 			System.out.println("Iteration " + i);
  31. 		System.out.println("collectAndThen " + cAT);
  32. 		System.out.println("sortFindFirst " + sFF);
  33. 		}
  34. 		}
  35. 	}
  36. }
Success #stdin #stdout 0.23s 34828KB
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Standard input is empty
stdout
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Iteration 0
collectAndThen 2.884806
sortFindFirst 1.898522
Iteration 100
collectAndThen 0.00792
sortFindFirst 0.010873
https://ideone.com/6naUo0
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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