本文整理了Java中java.util.Random类的一些代码示例，展示了Random类的具体用法。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类的具体详情如下：
包路径：java.util.Random
类名称：Random

Random介绍

[英]This class provides methods that return pseudo-random values.

It is dangerous to seed Random with the current time because that value is more predictable to an attacker than the default seed.

This class is thread-safe.
[中]此类提供返回伪随机值的方法。
使用当前时间随机设定种子是危险的，因为攻击者比默认种子更容易预测该值。
这个类是线程安全的。

代码示例

代码示例来源：origin: google/guava

static void assertHashByteBufferMatchesBytes(HashFunction hashFunction) {
 Random rng = new Random(0L);
 byte[] bytes = new byte[rng.nextInt(256) + 1];
 rng.nextBytes(bytes);
 assertEquals(hashFunction.hashBytes(bytes), hashFunction.hashBytes(ByteBuffer.wrap(bytes)));
}

代码示例来源：origin: skylot/jadx

public A test() {
  Random random = new Random();
  int a2 = random.nextInt();
  int a3 = a2 + 3;
  return new A(this, a2, a3, 4, 5, random.nextDouble()) {
    @Override
    public void m() {
      System.out.println(1);
    }
  };
}

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: commons-io/commons-io

public static byte[] generateRandomByteStream(final int pSize) {
  final byte[] buffer = new byte[pSize];
  final Random rnd = new Random();
  rnd.nextBytes(buffer);
  return buffer;
}

代码示例来源：origin: square/retrofit

/**
 * Randomly determine whether this call should result in a network failure in accordance with
 * configured behavior. When true, {@link #failureException()} should be thrown.
 */
public boolean calculateIsFailure() {
 return random.nextInt(100) < failurePercent;
}

代码示例来源：origin: google/guava

public void testIteratorTester() throws Exception {
 Random random = new Random(0);
 List<Integer> list = Lists.newArrayList();
 for (int i = 0; i < 3; i++) {
  list.add(random.nextInt());
 }
 runIterator(list, 6);
}

代码示例来源：origin: google/guava

@Override
 void performAction(Random random, Iterable<? extends PrimitiveSink> sinks) {
  byte[] value = new byte[random.nextInt(128)];
  random.nextBytes(value);
  int off = random.nextInt(value.length + 1);
  int len = random.nextInt(value.length - off + 1);
  for (PrimitiveSink sink : sinks) {
   sink.putBytes(value, off, len);
  }
 }
},

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

public AlternativeJdkIdGenerator() {
  SecureRandom secureRandom = new SecureRandom();
  byte[] seed = new byte[8];
  secureRandom.nextBytes(seed);
  this.random = new Random(new BigInteger(seed).longValue());
}

代码示例来源：origin: skylot/jadx

public void test() {
  final int a = new Random().nextInt();
  final long l = new Random().nextLong();
  func(new A(l) {
    @Override
    public void m() {
      System.out.println(a);
    }
  });
  System.out.println("a" + a);
  print(a);
  print2(1, a);
  print3(1, l);
}

代码示例来源：origin: google/guava

/**
 * Generates a number in [0, 2^numBits) with an exponential distribution. The floor of the log2 of
 * the absolute value of the result is chosen uniformly at random in [0, numBits), and then the
 * result is chosen from those possibilities uniformly at random.
 *
 * <p>Zero is treated as having log2 == 0.
 */
static double randomDouble(int maxExponent) {
 double result = RANDOM_SOURCE.nextDouble();
 result = Math.scalb(result, RANDOM_SOURCE.nextInt(maxExponent + 1));
 return RANDOM_SOURCE.nextBoolean() ? result : -result;
}

代码示例来源：origin: google/guava

public void testByteArrayRoundTrips() {
 Random r = new Random(5);
 byte[] b = new byte[Longs.BYTES];
 for (int i = 0; i < 1000; i++) {
  long num = r.nextLong();
  assertEquals(num, Longs.fromByteArray(Longs.toByteArray(num)));
  r.nextBytes(b);
  long value = Longs.fromByteArray(b);
  assertTrue("" + value, Arrays.equals(b, Longs.toByteArray(value)));
 }
}

代码示例来源：origin: google/guava

private static ImmutableList<Double> generatePseudorandomDataset() {
 Random random = new Random(2211275185798966364L);
 ImmutableList.Builder<Double> largeDatasetBuilder = ImmutableList.builder();
 for (int i = 0; i < PSEUDORANDOM_DATASET_SIZE; i++) {
  largeDatasetBuilder.add(random.nextGaussian());
 }
 return largeDatasetBuilder.build();
}

代码示例来源：origin: google/guava

@Override
protected final void setUp() throws Exception {
 boolean fair = new Random().nextBoolean();
 monitor = new Monitor(fair);
 tearDownStack.addTearDown(thread1 = new TestThread<>(monitor, "TestThread #1"));
 tearDownStack.addTearDown(thread2 = new TestThread<>(monitor, "TestThread #2"));
}

代码示例来源：origin: libgdx/libgdx

/** Returns a random number between start (inclusive) and end (inclusive). */
static public long random (long start, long end) {
  return start + (long)(random.nextDouble() * (end - start));
}

代码示例来源：origin: greenrobot/greenDAO

/** {@inheritDoc} */
protected Long createRandomPk() {
  return random.nextLong();
}

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

@Override
public UUID generateId() {
  byte[] randomBytes = new byte[16];
  this.random.nextBytes(randomBytes);
  long mostSigBits = 0;
  for (int i = 0; i < 8; i++) {
    mostSigBits = (mostSigBits << 8) | (randomBytes[i] & 0xff);
  }
  long leastSigBits = 0;
  for (int i = 8; i < 16; i++) {
    leastSigBits = (leastSigBits << 8) | (randomBytes[i] & 0xff);
  }
  return new UUID(mostSigBits, leastSigBits);
}

代码示例来源：origin: square/retrofit

/**
 * Randomly determine whether this call should result in an HTTP error in accordance with
 * configured behavior. When true, {@link #createErrorResponse()} should be returned.
 */
public boolean calculateIsError() {
 return random.nextInt(100) < errorPercent;
}

代码示例来源：origin: google/guava

public void testCorrectOrdering_mediumHeapsPollFirst() {
 for (int attempts = 0; attempts < reduceIterationsIfGwt(5000); attempts++) {
  int size = new Random().nextInt(256) + 16;
  ArrayList<Integer> elements = createOrderedList(size);
  List<Integer> expected = ImmutableList.copyOf(elements);
  MinMaxPriorityQueue<Integer> q = MinMaxPriorityQueue.create();
  long seed = insertRandomly(elements, q);
  while (!q.isEmpty()) {
   elements.add(q.pollFirst());
  }
  assertEqualsUsingSeed(seed, expected, elements);
 }
}

代码示例来源：origin: bumptech/glide

private Write getOffsetBufferWrite(Random random) {
 int dataSize = random.nextInt(MAX_BYTES_PER_WRITE * 2);
 byte[] data = new byte[dataSize];
 int length = dataSize == 0 ? 0 : random.nextInt(dataSize);
 int offset = dataSize - length <= 0 ? 0 : random.nextInt(dataSize - length);
 random.nextBytes(data);
 return new Write(data, length, offset, WriteType.OFFSET_BUFFER);
}

代码示例来源：origin: square/okhttp

/**
 * Uses {@code request} to connect a new web socket.
 */
@Override public WebSocket newWebSocket(Request request, WebSocketListener listener) {
 RealWebSocket webSocket = new RealWebSocket(request, listener, new Random(), pingInterval);
 webSocket.connect(this);
 return webSocket;
}