Java8-Stream-No.03

来源：互联网发布：二手淘宝店铺编辑：程序博客网时间：2024/05/20 09:09
import java.util.ArrayList;import java.util.List;import java.util.UUID;import java.util.concurrent.TimeUnit;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();    }}
阅读全文
1 0