java.util.Random.nextLong()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.util.Random.nextLong()方法的一些代码示例，展示了Random.nextLong()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Random.nextLong()方法的具体详情如下：
包路径：java.util.Random
类名称：Random
方法名：nextLong

Random.nextLong介绍

[英]Returns a pseudo-random uniformly distributed long.
[中]

代码示例

代码示例来源：origin: libgdx/libgdx

/** Creates a new random number generator. This constructor sets the seed of the random number generator to a value very likely
 * to be distinct from any other invocation of this constructor.
 * <p>
 * This implementation creates a {@link Random} instance to generate the initial seed. */
public RandomXS128 () {
  setSeed(new Random().nextLong());
}

代码示例来源：origin: jfinal/jfinal

public static String getAccessToken(HttpServletRequest request) {
    String accessToken = null;
    while (accessToken == null || accessToken.length() == 0) {
      long r0 = weakRandom ? (hashCode ^ Runtime.getRuntime().freeMemory() ^ random.nextInt() ^ (((long)request.hashCode()) << 32)) : random.nextLong();
      long r1 = random.nextLong();
      if (r0 < 0) r0 = -r0;
      if (r1 < 0) r1 = -r1;
      accessToken = Long.toString(r0, 36) + Long.toString(r1, 36);
    }
    return accessToken;
  }
}

代码示例来源：origin: apache/storm

@Override
  public void nextTuple() {
    try {
      Thread.sleep(100);
    } catch (InterruptedException e) {
      // ignore
    }
    // tuple values are mapped with
    // metric, timestamp, value, Map of tagK/tagV respectively.
    collector.emit(Lists.newArrayList("device.temp", System.currentTimeMillis(), new Random().nextLong(),
        Collections.singletonMap("loc.id", new Random().nextInt() % 64 + "")));
  }
}

代码示例来源：origin: apache/hbase

@Test
public void testSubmitRandomSizeRequest() throws Exception {
 Random rn = new Random();
 final long limit = 10 * 1024 * 1024;
 final int requestCount = 1 + (int) (rn.nextDouble() * 3);
 long n = rn.nextLong();
 if (n < 0) {
  n = -n;
 } else if (n == 0) {
  n = 1;
 }
 long putsHeapSize = n % limit;
 long maxHeapSizePerRequest = putsHeapSize / requestCount;
 LOG.info("[testSubmitRandomSizeRequest] maxHeapSizePerRequest=" + maxHeapSizePerRequest +
   ", putsHeapSize=" + putsHeapSize);
 doSubmitRequest(maxHeapSizePerRequest, putsHeapSize);
}

代码示例来源：origin: apache/ignite

/**
 * @throws Exception If failed.
 */
@Test
public void testShort() throws Exception {
  short val = (short)RND.nextLong();
  out.writeShort(val);
  assertEquals(val, getShortByByteLE(out.internalArray()));
  assertEquals(val, in.readShort());
}

代码示例来源：origin: apache/hive

@Test
public void testRandomAddSubtractInverse() {
 final int N = 1000000;
 int seed = 1427480960;
 Random rand = new Random(seed);
 long l1, l2;
 for (int i = 1; i <= N; i++) {
  l1 = rand.nextLong();
  l2 = rand.nextLong();
  verifyAddSubtractInverse(l1, l2);
 }
}

代码示例来源：origin: apache/avro

Rec1(Random r) {
  d1 = r.nextDouble();
  d11 = r.nextDouble();
  f2 = r.nextFloat();
  f22 = r.nextFloat();
  f3 = r.nextInt();
  f33 = r.nextInt();
  f4 = r.nextLong();
  f44 = r.nextLong();
  f5 = (byte) r.nextInt();
  f55 = (byte) r.nextInt();
  f6 = (short) r.nextInt();
  f66 = (short) r.nextInt();
 }
}

代码示例来源：origin: apache/flink

@Override
public void open(Configuration parameters) throws Exception {
  // this sink can only work with DOP 1
  assertEquals(1, getRuntimeContext().getNumberOfParallelSubtasks());
  long failurePosMin = (long) (0.4 * LINES_PER_FILE);
  long failurePosMax = (long) (0.7 * LINES_PER_FILE);
  elementsToFailure = (new Random().nextLong() % (failurePosMax - failurePosMin)) + failurePosMin;
}

代码示例来源：origin: SonarSource/sonarqube

@Test
public void clearMine_logs_map_sq_health_state_and_current_client_uuid_if_TRACE() {
 logging.setLevel(Level.TRACE);
 Map<String, TimestampedNodeHealth> map = new HashMap<>();
 map.put(randomAlphanumeric(4), new TimestampedNodeHealth(randomNodeHealth(), random.nextLong()));
 doReturn(map).when(hazelcastMember).getReplicatedMap(MAP_SQ_HEALTH_STATE);
 String uuid = randomAlphanumeric(5);
 when(hazelcastMember.getUuid()).thenReturn(uuid);
 underTest.clearMine();
 assertThat(logging.getLogs()).hasSize(1);
 assertThat(logging.hasLog(Level.TRACE, "Reading " + map + " and clearing for " + uuid)).isTrue();
}

代码示例来源：origin: google/guava

private static void assertHashLongEquivalence(HashFunction hashFunction, Random random) {
 long l = random.nextLong();
 assertEquals(hashFunction.hashLong(l), hashFunction.newHasher().putLong(l).hash());
}

代码示例来源：origin: thinkaurelius/titan

public static Multimap<String, Object> getRandomDocument() {
  final StringBuilder s = new StringBuilder();
  for (int i = 0; i < 3; i++) s.append(RandomGenerator.randomString(5, 8)).append(" ");
  Multimap values = HashMultimap.create();
  values.put(TEXT, s.toString());
  values.put(NAME, s.toString());
  values.put(TIME, Math.abs(random.nextLong()));
  values.put(WEIGHT, random.nextDouble());
  values.put(LOCATION, Geoshape.point(random.nextDouble() * 180 - 90, random.nextDouble() * 360 - 180));
  return values;
}

代码示例来源：origin: spring-projects/spring-loaded

@Test
public void encoding() {
  // long l = 82348278L;
  Random rand = new Random(666);
  for (int r = 0; r < 2000; r++) {
    long l = Math.abs(rand.nextLong());
    String encoded = Utils.encode(l);
    // System.out.println("Encoded " + l + " to " + encoded);
    long decoded = Utils.decode(encoded);
    assertEquals(l, decoded);
  }
}

代码示例来源：origin: apache/ignite

/**
 * @throws Exception If failed.
 */
@Test
public void testChar() throws Exception {
  char val = (char)RND.nextLong();
  out.writeChar(val);
  assertEquals(val, getCharByByteLE(out.internalArray()));
  assertEquals(val, in.readChar());
}

代码示例来源：origin: apache/storm

@Override
public void emitBatch(long batchId, TridentCollector collector) {
  List<List<Object>> values;
  if(batches.containsKey(batchId)) {
    values = batches.get(batchId);
  } else {
    values = new ArrayList<>();
    for (int i = 0; i < batchSize; i++) {
      // tuple values are mapped with
      // metric, timestamp, value, Map of tagK/tagV respectively.
      values.add(Lists.newArrayList(Lists.newArrayList("device.temp", System.currentTimeMillis(), new Random().nextLong(),
          Collections.singletonMap("loc.id", new Random().nextInt() % 64 + ""))));
    }
    batches.put(batchId, values);
  }
  for (List<Object> value : values) {
    collector.emit(value);
  }
}

代码示例来源：origin: apache/hive

@Test
public void testRandomMultiplyDivideInverse() {
 final int N = 100000;
 final long MASK56 = 0x00FFFFFFFFFFFFL; // 56 bit mask to generate positive 56 bit longs
                     // from random signed longs
 int seed = 897089790;
 Random rand = new Random(seed);
 long l1, l2;
 for (int i = 1; i <= N; i++) {
  l1 = rand.nextLong() & MASK56;
  l2 = rand.nextLong() & MASK56;
  verifyMultiplyDivideInverse(l1, l2);
 }
}

代码示例来源：origin: libgdx/libgdx

/** Creates a new random number generator. This constructor sets the seed of the random number generator to a value very likely
 * to be distinct from any other invocation of this constructor.
 * <p>
 * This implementation creates a {@link Random} instance to generate the initial seed. */
public RandomXS128 () {
  setSeed(new Random().nextLong());
}

代码示例来源：origin: apache/incubator-pinot

private static Object generateSingleValue(Random random, FieldSpec.DataType dataType) {
 switch (dataType) {
  case INT:
   return Math.abs(random.nextInt());
  case LONG:
   return Math.abs(random.nextLong());
  case FLOAT:
   return Math.abs(random.nextFloat());
  case DOUBLE:
   return Math.abs(random.nextDouble());
  case STRING:
   return RandomStringUtils.randomAlphabetic(DEFAULT_STRING_VALUE_LENGTH);
  default:
   throw new IllegalStateException("Illegal data type");
 }
}

代码示例来源：origin: jfinal/jfinal

public String generate(HttpServletRequest request) {
    String id = null;
    while (id == null || id.length() == 0) {	//)||idInUse(id))
      long r0 = weakRandom ? (hashCode()^Runtime.getRuntime().freeMemory()^random.nextInt()^(((long)request.hashCode())<<32)) : random.nextLong();
      long r1 = random.nextLong();
      if (r0<0) r0 = -r0;
      if (r1<0) r1 = -r1;
      id=Long.toString(r0,36)+Long.toString(r1,36);
    }
    return id;
  }
}

代码示例来源：origin: brianfrankcooper/YCSB

@Override
public Long nextValue() {
 long value = 0;
 Random random = ThreadLocalRandom.current();
 if (random.nextDouble() < hotOpnFraction) {
  // Choose a value from the hot set.
  value = lowerBound + Math.abs(random.nextLong()) % hotInterval;
 } else {
  // Choose a value from the cold set.
  value = lowerBound + hotInterval + Math.abs(random.nextLong()) % coldInterval;
 }
 setLastValue(value);
 return value;
}

代码示例来源：origin: apache/flink

@Test
public void testSimpleTypesObjects() {
  SimpleTypes a = new SimpleTypes();
  SimpleTypes b = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  SimpleTypes c = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  SimpleTypes d = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  SimpleTypes e = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  SimpleTypes f = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  SimpleTypes g = new SimpleTypes(rnd.nextInt(), rnd.nextLong(), (byte) rnd.nextInt(),
      StringUtils.getRandomString(rnd, 10, 100), (short) rnd.nextInt(), rnd.nextDouble());
  runTests(a, b, c, d, e, f, g);
}

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