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package com.winterbe.java8;

import java.util.ArrayList;

import java.util.List;

import java.util.UUID;

import java.util.concurrent.TimeUnit;

/**

* @author Benjamin Winterberg

*/

public class Streams3 {

public static final int MAX = 1000000;

public static void sortSequential() {

List<String> values = new ArrayList<>(MAX);

for (int i = 0; i < MAX; i++) {

UUID uuid = UUID.randomUUID();

values.add(uuid.toString());

}

// sequential

long t0 = System.nanoTime();

long count = values.stream().sorted().count();

System.out.println(count);

long t1 = System.nanoTime();

long millis = TimeUnit.NANOSECONDS.toMillis(t1 - t0);

System.out.println(String.format("sequential sort took: %d ms", millis));

}

public static void sortParallel() {

List<String> values = new ArrayList<>(MAX);

for (int i = 0; i < MAX; i++) {

UUID uuid = UUID.randomUUID();

values.add(uuid.toString());

}

// sequential

long t0 = System.nanoTime();

long count = values.parallelStream().sorted().count();

System.out.println(count);

long t1 = System.nanoTime();

long millis = TimeUnit.NANOSECONDS.toMillis(t1 - t0);

System.out.println(String.format("parallel sort took: %d ms", millis));

}

public static void main(String[] args) {

sortSequential();

sortParallel();

}

}