本文整理了Java中java.util.Random.<init>()方法的一些代码示例，展示了Random.<init>()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.<init>()方法的具体详情如下：
包路径：java.util.Random
类名称：Random
方法名：<init>

Random.<init>介绍

[英]Constructs a random generator with an initial state that is unlikely to be duplicated by a subsequent instantiation.

The initial state (that is, the seed) is partially based on the current time of day in milliseconds.
[中]构造一个初始状态不太可能被后续实例化复制的随机生成器。
初始状态（即种子）部分基于当前时间（以毫秒为单位）。

代码示例

代码示例来源：origin: skylot/jadx

private static String generateTagAttrName() {
  final int length = 6;
  Random r = new Random();
  StringBuilder sb = new StringBuilder();
  for (int i = 1; i <= length; i++) {
    sb.append((char) (r.nextInt(26) + 'a'));
  }
  return sb.toString();
}

代码示例来源：origin: apache/incubator-shardingsphere

@Override
  public String getDataSource(final String name, final String masterDataSourceName, final List<String> slaveDataSourceNames) {
    return slaveDataSourceNames.get(new Random().nextInt(slaveDataSourceNames.size()));
  }
}

代码示例来源：origin: chrisbanes/cheesesquare

private List<String> getRandomSublist(String[] array, int amount) {
  ArrayList<String> list = new ArrayList<>(amount);
  Random random = new Random();
  while (list.size() < amount) {
    list.add(array[random.nextInt(array.length)]);
  }
  return list;
}

代码示例来源：origin: prestodb/presto

private List<String> createVarcharValuesWithNulls()
  {
    Random random = new Random();
    List<String> values = new ArrayList<>();
    for (int i = 0; i < ROWS; ++i) {
      if (random.nextBoolean()) {
        values.add(Strings.repeat("0", 4));
      }
      else {
        values.add(null);
      }
    }
    return values;
  }
}

代码示例来源：origin: alibaba/arthas

public static void main(String[] args) throws InterruptedException {
  List<Pojo> list = new ArrayList<Pojo>();
  for (int i = 0; i < 40; i ++) {
    Pojo pojo = new Pojo();
    pojo.setName("name " + i);
    pojo.setAge(i + 2);
    list.add(pojo);
  }
  System.out.println(p);
  while (true) {
    int random = new Random().nextInt(40);
    String name = list.get(random).getName();
    list.get(random).setName(null);
    test(list);
    list.get(random).setName(name);
    Thread.sleep(1000L);
  }
}

代码示例来源：origin: ReactiveX/RxJava

@Test(timeout = 30000)
public void flatMapRangeMixedAsyncLoop() {
  for (int i = 0; i < 2000; i++) {
    if (i % 10 == 0) {
      System.out.println("flatMapRangeAsyncLoop > " + i);
      final Random rnd = new Random();
      @Override
      public Observable<Integer> apply(Integer t) {
      System.out.println(to.valueCount());
    if (list.size() < 1000) {
      Set<Integer> set = new HashSet<Integer>(list);
      for (int j = 0; j < 1000; j++) {
        if (!set.contains(j)) {
          System.out.println(j + " missing");
    assertEquals(1000, list.size());

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: stackoverflow.com

Random r = new Random();

Map<Boolean, List<String>> groups = stream
  .collect(Collectors.partitioningBy(x -> r.nextBoolean()));

System.out.println(groups.get(false).size());
System.out.println(groups.get(true).size());

代码示例来源：origin: google/guava

public void testArbitrary_withCollisions() {
 List<Integer> list = Lists.newArrayList();
 for (int i = 0; i < 50; i++) {
  list.add(i);
 }
 Ordering<Object> arbitrary =
   new ArbitraryOrdering() {
    @Override
    int identityHashCode(Object object) {
     return ((Integer) object) % 5; // fake tons of collisions!
    }
   };
 // Don't let the elements be in such a predictable order
 list = shuffledCopy(list, new Random(1));
 Collections.sort(list, arbitrary);
 // Now we don't care what order it's put the list in, only that
 // comparing any pair of elements gives the answer we expect.
 Helpers.testComparator(arbitrary, list);
}

代码示例来源：origin: stanfordnlp/CoreNLP

public static void main(String[] args) {
 Properties config = StringUtils.argsToProperties(args);
 log.info(config);
 boolean fullSentence = PropertiesUtils.getBool(config, "fullSentence", false);
 Random random = new Random();
 String tagSeparator = config.getProperty("tagSeparator", TaggerConfig.TAG_SEPARATOR);
 TaggedFileRecord record = TaggedFileRecord.createRecord(config, config.getProperty("input"));
 for (List<TaggedWord> sentence : record.reader()) {
  int len = random.nextInt(sentence.size()) + 1;
  System.out.println(SentenceUtils.listToString(sentence.subList(0, len), false, tagSeparator));
  if (fullSentence) {
   System.out.println(SentenceUtils.listToString(sentence, false, tagSeparator));
  }
 }
}

代码示例来源：origin: stackoverflow.com

int[] array = new int[10];
Random rand = new Random();
for (int i = 0; i < array.length; i++)
  array[i] = rand.nextInt(100) + 1;
Arrays.sort(array);
System.out.println(Arrays.toString(array));
// in reverse order
for (int i = array.length - 1; i >= 0; i--)
  System.out.print(array[i] + " ");
System.out.println();

代码示例来源：origin: google/guava

public void testPercentiles_indexes_varargsAll_compute_doubleCollection() {
 ArrayList<Integer> indexes = new ArrayList<>();
 ImmutableMap.Builder<Integer, Double> expectedBuilder = ImmutableMap.builder();
 for (int index = 0; index <= 100; index++) {
  indexes.add(index);
  expectedBuilder.put(index, expectedLargeDatasetPercentile(index));
 }
 Random random = new Random(770683168895677741L);
 Collections.shuffle(indexes, random);
 assertThat(percentiles().indexes(Ints.toArray(indexes)).compute(PSEUDORANDOM_DATASET))
   .comparingValuesUsing(QUANTILE_CORRESPONDENCE)
   .containsExactlyEntriesIn(expectedBuilder.build());
}

代码示例来源：origin: thinkaurelius/titan

@Test
public void testTimeSequence() throws Exception {
  Random r = new Random();
  Instant[] times = new Instant[10];
  for (int i = 0; i < times.length; i++) {
    times[i] = TimestampProviders.NANO.getTime();
    if (i > 0) assertTrue(times[i] + " > " + times[i - 1], times[i].compareTo(times[i - 1])>0);
    Thread.sleep(r.nextInt(50) + 2);
  }
}

代码示例来源：origin: apache/incubator-druid

@Test
 public void testOrderByWithLimit()
 {
  List<String> expected = rawInput.subList(0, Math.min(limit, rawInput.size()));
  List<String> inputs = Lists.newArrayList(rawInput);
  Collections.shuffle(inputs, new Random(2));

  Sequence<String> result = new TopNSequence<String>(Sequences.simple(inputs), ordering, limit);

  Assert.assertEquals(expected, result.toList());
 }
}

代码示例来源：origin: org.apache.commons/commons-lang3

@Test
public void testLANG805() {
  final long seed = System.currentTimeMillis();
  assertEquals("aaa", RandomStringUtils.random(3,0,0,false,false,new char[]{'a'},new Random(seed)));
}

代码示例来源：origin: LitePalFramework/LitePal

private void saveAllByRandom() {
  List<LitePalSupport> modelList = getModelList();
  while (!modelList.isEmpty()) {
    Random rand = new Random();
    int index = rand.nextInt(modelList.size());
    LitePalSupport model = modelList.remove(index);
    model.save();
  }
}

代码示例来源：origin: shekhargulati/99-problems

@Test
public void shouldWorkOnARandomArray() throws Exception {
  int[] numbers = new Random().ints(100000, 1, 100000).toArray();
  long start = System.currentTimeMillis();
  int[] pairs = Problem01.twoSum(numbers, 100);
  long end = System.currentTimeMillis();
  System.out.println(String.format("Total time taken %d sec(s)", (end - start) / 1000));
  System.out.println(Arrays.toString(pairs));
  assertThat(pairs.length, equalTo(2));
}

代码示例来源：origin: stackoverflow.com

import objectexplorer.ObjectGraphMeasurer;

public class Measurer {

 public static void main(String[] args) {
  Set<Integer> hashset = new HashSet<Integer>();
  Random rng = new Random();
  int n = 10000;
  for (int i = 1; i <= n; i++) {
   hashset.add(random.nextInt());
  }
  System.out.println(ObjectGraphMeasurer.measure(hashset));
 }
}

代码示例来源：origin: apache/storm

/**
   * Creates a two task assignment by selecting random tasks.
   */
  public int[] createAssignment(List<Integer> tasks, byte[] key) {
    // It is necessary that this produce a deterministic assignment based on the key, so seed the Random from the key
    final long seedForRandom = Arrays.hashCode(key);
    final Random random = new Random(seedForRandom);
    final int choice1 = random.nextInt(tasks.size());
    int choice2 = random.nextInt(tasks.size());
    // ensure that choice1 and choice2 are not the same task
    choice2 = choice1 == choice2 ? (choice2 + 1) % tasks.size() : choice2;
    return new int[]{ tasks.get(choice1), tasks.get(choice2) };
  }
}

代码示例来源：origin: prestodb/presto

private List<SqlDecimal> createDecimalValuesNoNull()
  {
    Random random = new Random();
    List<SqlDecimal> values = new ArrayList<>();
    for (int i = 0; i < ROWS; ++i) {
      values.add(new SqlDecimal(BigInteger.valueOf(random.nextLong() % 10000000000L), 10, 5));
    }
    return values;
  }
}