java.util.IntSummaryStatistics Java Examples

The following examples show how to use java.util.IntSummaryStatistics. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: HighFrequencyDetector.java    From ffwd with Apache License 2.0 6 votes vote down vote up 
private int computeTimeDelta(List<Metric> list) {
  int size = list.size();
  IntSummaryStatistics stats = IntStream.range(1, size)
      .map(
          x ->
              (int)
                  (list.get(size - x).getTime().getTime()
                      - list.get(size - x - 1).getTime().getTime()))
      .filter(d -> (d >= 0 && d < minFrequencyMillisAllowed))
      .summaryStatistics();

  int result = -1;

  /**
   * In order to be marked as high frequency metric the number of points
   * should be above the BURST_THRESHOLD.
   * It ignores any small bursts of high frequency metrics.
   */
  if (stats.getCount() > BURST_THRESHOLD) {
    // uses minimal delta time from all consecutive data points
    result = stats.getMin();
    log.info("stats: " + stats);
  }
  return result;
}
Example #2
Source File: CollectAndSummaryStatisticsTest.java    From jdk8u_jdk with GNU General Public License v2.0 6 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).stream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                  IntSummaryStatistics::accept,
                                                                  IntSummaryStatistics::combine));
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                          IntSummaryStatistics::accept,
                                                                          IntSummaryStatistics::combine));

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getAverage(), (double) stats.getSum() / stats.getCount());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #3
Source File: ConcurrentTestRunnerTest.java    From james-project with Apache License 2.0 6 votes vote down vote up 
@Test
void runRandomlyDistributedReactorOperationsShouldRunAllOperationsEvenly() throws ExecutionException, InterruptedException {
    AtomicInteger firstOperationRuns = new AtomicInteger(0);
    AtomicInteger secondOperationRuns = new AtomicInteger(0);
    AtomicInteger thirdOperationRuns = new AtomicInteger(0);
    int threadCount = 10;
    int operationCount = 1000;
    ConcurrentTestRunner.builder()
        .randomlyDistributedReactorOperations(
            (threadNumber, step) -> Mono.fromRunnable(firstOperationRuns::incrementAndGet),
            (threadNumber, step) -> Mono.fromRunnable(secondOperationRuns::incrementAndGet),
            (threadNumber, step) -> Mono.fromRunnable(thirdOperationRuns::incrementAndGet))
        .threadCount(threadCount)
        .operationCount(operationCount)
        .runSuccessfullyWithin(Duration.ofMinutes(1));

    IntSummaryStatistics statistics = IntStream.of(firstOperationRuns.get(), secondOperationRuns.get(), thirdOperationRuns.get()).summaryStatistics();
    int min = statistics.getMin();
    int max = statistics.getMax();

    assertThat(max - min).isLessThan((threadCount * operationCount) * 5 / 100);
}
Example #4
Source File: ConcurrentTestRunnerTest.java    From james-project with Apache License 2.0 6 votes vote down vote up 
@Test
void runRandomlyDistributedOperationsShouldRunAllOperationsEvenly() throws ExecutionException, InterruptedException {
    AtomicInteger firstOperationRuns = new AtomicInteger(0);
    AtomicInteger secondOperationRuns = new AtomicInteger(0);
    AtomicInteger thirdOperationRuns = new AtomicInteger(0);
    int threadCount = 10;
    int operationCount = 1000;
    ConcurrentTestRunner.builder()
        .randomlyDistributedOperations(
            (threadNumber, step) -> firstOperationRuns.incrementAndGet(),
            (threadNumber, step) -> secondOperationRuns.incrementAndGet(),
            (threadNumber, step) -> thirdOperationRuns.incrementAndGet())
        .threadCount(threadCount)
        .operationCount(operationCount)
        .runSuccessfullyWithin(Duration.ofMinutes(1));

    IntSummaryStatistics statistics = IntStream.of(firstOperationRuns.get(), secondOperationRuns.get(), thirdOperationRuns.get()).summaryStatistics();
    int min = statistics.getMin();
    int max = statistics.getMax();

    assertThat(max - min).isLessThan((threadCount * operationCount) * 5 / 100);
}
Example #5
Source File: IntCollectorTest.java    From streamex with Apache License 2.0 6 votes vote down vote up 
@Test
public void testSummarizing() {
    withRandom(r -> {
        int[] data = IntStreamEx.of(r, 1000, 1, Integer.MAX_VALUE).toArray();
        IntSummaryStatistics expected = IntStream.of(data).summaryStatistics();
        IntSummaryStatistics statistics = IntStreamEx.of(data).collect(IntCollector.summarizing());
        assertEquals(expected.getCount(), statistics.getCount());
        assertEquals(expected.getSum(), statistics.getSum());
        assertEquals(expected.getMax(), statistics.getMax());
        assertEquals(expected.getMin(), statistics.getMin());
        statistics = IntStreamEx.of(data).parallel().collect(IntCollector.summarizing());
        assertEquals(expected.getCount(), statistics.getCount());
        assertEquals(expected.getSum(), statistics.getSum());
        assertEquals(expected.getMax(), statistics.getMax());
        assertEquals(expected.getMin(), statistics.getMin());
    });
}
Example #6
Source File: CollectAndSummaryStatisticsTest.java    From dragonwell8_jdk with GNU General Public License v2.0 6 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).stream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                  IntSummaryStatistics::accept,
                                                                  IntSummaryStatistics::combine));
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                          IntSummaryStatistics::accept,
                                                                          IntSummaryStatistics::combine));

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getAverage(), (double) stats.getSum() / stats.getCount());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #7
Source File: IntSummaryStatisticsExample.java    From levelup-java-examples with Apache License 2.0 6 votes vote down vote up 
@Test
public void int_summary_stats_with_stream() {

	IntSummaryStatistics stats = orderEntries.stream()
			.mapToInt((x) -> x.getAmount()).summaryStatistics();

	// average
	assertEquals(13.5, stats.getAverage(), 0);

	// count
	assertEquals(4, stats.getCount(), 0);

	// max
	assertEquals(18, stats.getMax(), 0);

	// min
	assertEquals(10, stats.getMin(), 0);

	// sum
	assertEquals(54, stats.getSum(), 0);
}
Example #8
Source File: CollectAndSummaryStatisticsTest.java    From openjdk-jdk8u with GNU General Public License v2.0 6 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).stream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                  IntSummaryStatistics::accept,
                                                                  IntSummaryStatistics::combine));
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
                                                                          IntSummaryStatistics::accept,
                                                                          IntSummaryStatistics::combine));

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getAverage(), (double) stats.getSum() / stats.getCount());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #9
Source File: FirstDdemo.java    From javabase with Apache License 2.0 5 votes vote down vote up 
private static void getMax() {
    List<Integer> primes = Arrays.asList(2, 3, 5, 7, 11, 13, 17, 19, 23, 29);
    IntSummaryStatistics stats = primes.stream().mapToInt((x) -> x)
            .summaryStatistics();
    System.out.println("Highest prime number in List : " + stats.getMax());
    System.out.println("Lowest prime number in List : " + stats.getMin());
    System.out.println("Sum of all prime numbers : " + stats.getSum());
    System.out.println("Average of all prime numbers : " + stats.getAverage());

}
Example #10
Source File: Primitives.java    From java-8-lambdas-exercises with MIT License 5 votes vote down vote up 
public static void printTrackLengthStatistics(Album album) {
    IntSummaryStatistics trackLengthStats
            = album.getTracks()
                   .mapToInt(track -> track.getLength())
                   .summaryStatistics();

    System.out.printf("Max: %d, Min: %d, Ave: %f, Sum: %d",
                      trackLengthStats.getMax(),
                      trackLengthStats.getMin(),
                      trackLengthStats.getAverage(),
                      trackLengthStats.getSum());
}
Example #11
Source File: SummaryStatisticsTest.java    From openjdk-8-source with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #12
Source File: SummaryStatisticsTest.java    From openjdk-8 with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #13
Source File: SummaryStatisticsTest.java    From hottub with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #14
Source File: HashMapVisualiser.java    From map-visualiser with MIT License 5 votes vote down vote up 
public void visualise(final HashMap<?, ?> map)
{
    Object[] table = (Object[]) Type.get(tableField, map);

    console.printf(
        "Size: %d, Resize: %s, Bin Count: %d%n",
        map.size(), Type.get(thresholdField, map), table.length);

    final IntSummaryStatistics collisions = Stream.of(table)
        .mapToInt(row ->
        {
            if (row == null)
            {
                console.println("[]");
                return 0;
            }

            switch (row.getClass().getSimpleName())
            {
                case "TreeNode":
                    return visualiseTree(row);

                case "Node":
                    return visualiseList(row);

                default:
                    throw new IllegalArgumentException("Unknown type of row");
            }
        })
        .summaryStatistics();

    console.printf(
        "Collisions: Max: %d, Ave: %s, Total: %d%n",
        collisions.getMax(),
        collisions.getAverage(),
        collisions.getSum());
}
Example #15
Source File: PlanFragmentStats.java    From dremio-oss with Apache License 2.0 5 votes vote down vote up 
public PlanFragmentStats() {
  sizeByMajorSpecific = new HashMap<>();
  sizeByMinorSpecific = new HashMap<>();
  sizeByMinorAttr = new HashMap<>();
  sizeBySharedAttr = new HashMap<>();
  combinedSize = new IntSummaryStatistics();
}
Example #16
Source File: ReaderCheckpointTest.java    From pravega with Apache License 2.0 5 votes vote down vote up 
private void verifyEvents(final List<EventRead<Integer>> events, int startInclusive, int endExclusive) {

        Supplier<java.util.stream.Stream<Integer>> streamSupplier = () -> events.stream().map(EventRead::getEvent).sorted();
        IntSummaryStatistics stats = streamSupplier.get().collect(Collectors.summarizingInt(value -> value));

        assertTrue(String.format("Check for first event: %d, %d", stats.getMin(), startInclusive),
                stats.getMin() == startInclusive);
        assertTrue(String.format("Check for last event: %d, %d", stats.getMax(), endExclusive),
                stats.getMax() == endExclusive - 1);
        //Check for missing events
        assertEquals(String.format("Check for number of events: %d, %d, %d", endExclusive, startInclusive, stats.getCount()),
                endExclusive - startInclusive, stats.getCount());
        assertEquals(String.format("Check for duplicate events: %d, %d, %d", endExclusive, startInclusive, streamSupplier.get().distinct().count()),
                endExclusive - startInclusive, streamSupplier.get().distinct().count());
    }
Example #17
Source File: Streams10.java    From java8-tutorial with MIT License 5 votes vote down vote up 
private static void test4(List<Person> persons) {
    IntSummaryStatistics ageSummary =
        persons
            .stream()
            .collect(Collectors.summarizingInt(p -> p.age));

    System.out.println(ageSummary);
    // IntSummaryStatistics{count=4, sum=76, min=12, average=19,000000, max=23}
}
Example #18
Source File: Java8GroupingByCollectorUnitTest.java    From tutorials with MIT License 5 votes vote down vote up 
@Test
public void givenAListOfPosts_whenGroupedByTypeAndSummarizingLikes_thenGetAMapBetweenTypeAndSummary() {
    Map<BlogPostType, IntSummaryStatistics> likeStatisticsPerType = posts.stream()
        .collect(groupingBy(BlogPost::getType, summarizingInt(BlogPost::getLikes)));

    IntSummaryStatistics newsLikeStatistics = likeStatisticsPerType.get(BlogPostType.NEWS);

    assertEquals(2, newsLikeStatistics.getCount());
    assertEquals(50, newsLikeStatistics.getSum());
    assertEquals(25.0, newsLikeStatistics.getAverage(), 0.001);
    assertEquals(35, newsLikeStatistics.getMax());
    assertEquals(15, newsLikeStatistics.getMin());
}
Example #19
Source File: SummaryStatisticsTest.java    From jdk8u-dev-jdk with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}
Example #20
Source File: FormationType.java    From megamek with GNU General Public License v2.0 5 votes vote down vote up 
private static IntSummaryStatistics damageAtRangeStats(MechSummary ms, int range) {
    List<Integer> retVal = new ArrayList<>();
    for (int i = 0; i < ms.getEquipmentNames().size(); i++) {
        if (EquipmentType.get(ms.getEquipmentNames().get(i)) instanceof WeaponType) {
            final WeaponType weapon = (WeaponType)EquipmentType.get(ms.getEquipmentNames().get(i));
            if (weapon.getLongRange() < range) {
                continue;
            }
            int damage = 0;
            if (weapon.getAmmoType() != AmmoType.T_NA) {
                Optional<EquipmentType> ammo = ms.getEquipmentNames().stream()
                    .map(name -> EquipmentType.get(name))
                    .filter(eq -> eq instanceof AmmoType
                            && ((AmmoType)eq).getAmmoType() == weapon.getAmmoType()
                            && ((AmmoType)eq).getRackSize() == weapon.getRackSize())
                    .findFirst();
                if (ammo.isPresent()) {
                    damage = ((AmmoType)ammo.get()).getDamagePerShot()
                            * Math.max(1, ((AmmoType)ammo.get()).getRackSize());
                }
            } else {
                damage = weapon.getDamage(range);
            }
            if (damage > 0) {
                for (int j = 0; j < ms.getEquipmentQuantities().get(i); j++) {
                    retVal.add(damage);
                }
            }
        }
    }
    return retVal.stream().mapToInt(Integer::intValue).summaryStatistics();
}
Example #21
Source File: Java8TestCase.java    From symja_android_library with GNU General Public License v3.0 5 votes vote down vote up 
public void testStatistics() {
	IAST ast = (IAST) F.List.of(10, 11, 12, 13, 14, 15, 16, 17, 18, 19);

	// calculating sum using reduce terminal operator
	int value = ast.stream() //
			.mapToInt(IExpr::toIntDefault) //
			.reduce(0, (total, currentValue) -> total + currentValue);
	assertEquals(145, value);

	value = ast.stream() //
			.mapToInt(IExpr::toIntDefault) //
			.sum();
	assertEquals(145, value);

	long longValue = ast.stream() //
			.mapToInt(IExpr::toIntDefault) //
			.count();
	assertEquals(10, longValue);

	IntSummaryStatistics ageStatistics = ast.stream() //
			.mapToInt(IExpr::toIntDefault) //
			.summaryStatistics();

	assertEquals(14.5, ageStatistics.getAverage());
	assertEquals(10, ageStatistics.getCount());
	assertEquals(19, ageStatistics.getMax());
	assertEquals(10, ageStatistics.getMin());
	assertEquals(145, ageStatistics.getSum());
}
Example #22
Source File: CollectAndSummaryStatisticsTest.java    From jdk8u_jdk with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntCollectNull() {
    checkNPE(() -> IntStream.of(1).collect(null,
                                           IntSummaryStatistics::accept,
                                           IntSummaryStatistics::combine));
    checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
                                           null,
                                           IntSummaryStatistics::combine));
    checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
                                           IntSummaryStatistics::accept,
                                           null));
}
Example #23
Source File: IntSummaryStatisticsTest.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
public void test_empty() {
    IntSummaryStatistics iss = new IntSummaryStatistics();
    assertEquals(0, iss.getCount());
    assertEquals(0, iss.getSum());
    assertEquals(0.0d, iss.getAverage());
    assertEquals(Integer.MAX_VALUE, iss.getMin());
    assertEquals(Integer.MIN_VALUE, iss.getMax());
}
Example #24
Source File: CollectAndSummaryStatisticsTest.java    From openjdk-jdk8u with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntCollectNull() {
    checkNPE(() -> IntStream.of(1).collect(null,
                                           IntSummaryStatistics::accept,
                                           IntSummaryStatistics::combine));
    checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
                                           null,
                                           IntSummaryStatistics::combine));
    checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
                                           IntSummaryStatistics::accept,
                                           null));
}
Example #25
Source File: IntSummaryStatisticsTest.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
public void test_combine() {
    IntSummaryStatistics iss1 = getIntSummaryStatisticsData2();
    IntSummaryStatistics issCombined = getIntSummaryStatisticsData1();
    issCombined.combine(iss1);

    assertEquals(12, issCombined.getCount());
    assertEquals(118, issCombined.getSum());
    assertEquals(100, issCombined.getMax());
    assertEquals(-5, issCombined.getMin());
    assertEquals(9.833333d, issCombined.getAverage(), 1E-6);
}
Example #26
Source File: GroupbyTest.java    From spring-boot-cookbook with Apache License 2.0 5 votes vote down vote up 
@Test
public void test() {
    List<String> strings = Arrays.asList("a", "bb", "cc", "ddd");
    Map<Integer, IntSummaryStatistics> result = strings.stream()
            .collect(groupingBy(String::length, summarizingInt(String::hashCode)));
    System.out.println(result);
}
Example #27
Source File: IntSummaryStatisticsTest.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
private static IntSummaryStatistics getIntSummaryStatisticsData1() {
    IntSummaryStatistics iss = new IntSummaryStatistics();
    for (int value : data1) {
        iss.accept(value);
    }
    return iss;
}
Example #28
Source File: Primitives.java    From https-github.com-RichardWarburton-java-8-Lambdas-exercises with MIT License 5 votes vote down vote up 
public static void printTrackLengthStatistics(Album album) {
    IntSummaryStatistics trackLengthStats
            = album.getTracks()
                   .mapToInt(track -> track.getLength())
                   .summaryStatistics();

    System.out.printf("Max: %d, Min: %d, Ave: %f, Sum: %d",
                      trackLengthStats.getMax(),
                      trackLengthStats.getMin(),
                      trackLengthStats.getAverage(),
                      trackLengthStats.getSum());
}
Example #29
Source File: IntSummaryStatisticsTest.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
public void test_accept() {
    IntSummaryStatistics iss = new IntSummaryStatistics();
    iss.accept(5);
    assertEquals(1, iss.getCount());
    assertEquals(5, iss.getSum());
    iss.accept(10);
    assertEquals(2, iss.getCount());
    assertEquals(15, iss.getSum());
}
Example #30
Source File: SummaryStatisticsTest.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 5 votes vote down vote up 
public void testIntStatistics() {
    List<IntSummaryStatistics> instances = new ArrayList<>();
    instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
    instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
    instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());

    for (IntSummaryStatistics stats : instances) {
        assertEquals(stats.getCount(), 1000);
        assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
        assertEquals(stats.getMax(), 1000);
        assertEquals(stats.getMin(), 1);
    }
}