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());
}
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());
}
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();
}
}
转载于:https://www.cnblogs.com/bilaisheng/p/10210935.html
