Last active
October 5, 2016 18:13
-
-
Save fernandogodoy/a1e29a36317f651171e5e9b7899d5df8 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package com.matera.jud.bu; | |
import java.util.ArrayList; | |
import java.util.Date; | |
import java.util.List; | |
import java.util.stream.Collectors; | |
public class Teste { | |
public static void main(String[] args) { | |
List<Integer> lista = new ArrayList<>(); | |
List<Integer> listStream = new ArrayList<>(); | |
List<Integer> listParallelStream = new ArrayList<>(); | |
for (int i = 0; i < 9999999; i++) { | |
lista.add(i); | |
} | |
System.out.println(" ======== "); | |
Long init = 0l; | |
Long fim = 0l; | |
init = new Date().getTime(); | |
listStream = lista.stream().collect(Collectors.toList()); | |
fim = new Date().getTime(); | |
System.out.println("Tempo copia utilizando stream = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
listParallelStream = lista.parallelStream().collect(Collectors.toList()); | |
fim = new Date().getTime(); | |
System.out.println("Tempo copia utilizando parallelStream = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
lista.forEach(p -> { | |
if ((p % 2 == 0)) { | |
p.intValue(); | |
} | |
}); | |
fim = new Date().getTime(); | |
System.out.println("Tempo para percorrer utilizando foreach = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
listStream.stream().filter(p -> p % 2 == 0).forEach(p -> p.intValue()); | |
fim = new Date().getTime(); | |
System.out.println("Tempo para percorrer utilizando stream = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
listParallelStream.parallelStream().filter(p -> p % 2 == 0).forEach(p -> p.intValue()); | |
fim = new Date().getTime(); | |
System.out.println("Tempo para percorrer utilizando parallelStream = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
listStream.stream().filter(p -> p % 12 == 0).filter(p -> p > 123456).findFirst(); | |
fim = new Date().getTime(); | |
System.out.println("Tempo para encontrar 1 item na lista utilizando stream = " + (fim - init)); | |
System.out.println(" ======== "); | |
init = 0l; | |
fim = 0l; | |
init = new Date().getTime(); | |
listParallelStream.parallelStream().filter(p -> p % 12 == 0).filter(p -> p > 123456).findFirst(); | |
fim = new Date().getTime(); | |
System.out.println("Tempo para encontrar 1 item na lista utilizando parallelStream = " + (fim - init)); | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
======== | |
Tempo copia utilizando stream = 4352 | |
======== | |
Tempo copia utilizando parallelStream = 499 | |
======== | |
Tempo para percorrer utilizando foreach = 47 | |
======== | |
Tempo para percorrer utilizando stream = 142 | |
======== | |
Tempo para percorrer utilizando parallelStream = 117 | |
======== | |
Tempo para encontrar 1 item na lista utilizando stream = 24 | |
======== | |
Tempo para encontrar 1 item na lista utilizando parallelStream = 12 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment