Example usage for java.util Random Random

Introduction

In this page you can find the example usage for java.util Random Random.

Prototype

public Random(long seed) 

Source Link

Document

Creates a new random number generator using a single long seed.

Usage

From source file:Main.java

public static void genRandom(long seed, int max, int factor, int offset, int array[]) {
    Random r = new Random(seed);
    for (int i = 0; i < array.length; i++) {
        array[i] = (r.nextInt(max) * factor + offset);
    }//from  www  . j  a  v  a2  s  .  co m
}

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From source file:Main.java

public static <T extends BroadcastReceiver> void scheduleUpdate(Context context, Class<T> clazz) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, clazz);
    PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    Random random = new Random(System.currentTimeMillis());
    long offset = random.nextLong() % (12 * 60 * 60 * 1000);
    long interval = (24 * 60 * 60 * 1000) + offset;
    String prefKey = "pref_scheduled_monitor_config_update_" + clazz.getCanonicalName();
    long scheduledTime = preferences.getLong(prefKey, -1);

    if (scheduledTime == -1) {
        context.sendBroadcast(intent);/* w  ww .  j  a  va 2s  . c  o  m*/
    }

    if (scheduledTime <= System.currentTimeMillis()) {
        context.sendBroadcast(intent);
        scheduledTime = System.currentTimeMillis() + interval;
        preferences.edit().putLong(prefKey, scheduledTime).commit();
        Log.w("PeriodicActionUtils",
                "Scheduling for all new time: " + scheduledTime + " (" + clazz.getSimpleName() + ")");
    } else {
        Log.w("PeriodicActionUtils", "Scheduling for time found in preferences: " + scheduledTime + " ("
                + clazz.getSimpleName() + ")");
    }

    am.cancel(sender);
    am.set(AlarmManager.RTC_WAKEUP, scheduledTime, sender);

    Log.w("PeriodicActionUtils", "Scheduled for: " + scheduledTime + " (" + clazz.getSimpleName() + ")");
}

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From source file:com.jivesoftware.os.jive.utils.id.IdTest.java

@Test
public void idStringTest() throws Exception {
    final Random r = new Random(1234);
    for (int i = 0; i < 100; i++) {
        long id = Math.abs(r.nextLong());
        Id wid = new Id(id);
        Id rid = MAPPER.readValue(MAPPER.writeValueAsString(wid), Id.class);

        Assert.assertEquals(rid, wid, "Failed to map Id through String: " + id);
    }/*from  www .j  av  a 2  s  . co  m*/
}

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From source file:iddb.core.util.PasswordUtils.java

public static String hashPassword(String raw_password) {
    Random random = new Random(raw_password.length() + System.currentTimeMillis());
    String salt = StringUtils.left(HashUtils.getSHA1Hash(
            Float.toHexString(random.nextFloat()) + Float.toHexString(System.currentTimeMillis())), 5);
    String hashedPassword = HashUtils.getSHA1Hash(salt + raw_password);
    return salt + "$" + hashedPassword;
}

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From source file:info.rmarcus.birkhoffvonneumann.ChiSquaredTest.java

public static void testMethod(SamplingAlgorithm samp, int n, int samples) throws BVNException {
    double[][] bistoc = MatrixUtils.uniformBistoc(n);

    long[] classes = new long[factorial(bistoc.length)];

    BVNDecomposer bvn = new BVNDecomposer();
    bvn.setSamplingAlgorithm(samp);/*w  w  w  .  j a  va  2s  .co  m*/
    Random r = new Random(42);

    for (int i = 0; i < samples; i++) {
        int[] p = CoeffAndMatrix.asFlatPerm(bvn.sample(r, bistoc));
        classes[inv(p)]++;
    }

    double[] expected = new double[classes.length];
    for (int i = 0; i < expected.length; i++)
        expected[i] = (double) classes.length / (double) samples;

    ChiSquareTest chiT = new ChiSquareTest();
    double testStat = chiT.chiSquare(expected, classes);

    ChiSquaredDistribution chi = new ChiSquaredDistribution(classes.length - 1);
    System.out.println(Arrays.toString(classes));
    System.out.println(chi.cumulativeProbability(testStat) + "\t" + testStat);

}

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From source file:com.dianping.dpsf.other.echo.SimpleEchoClient.java

private static List<String[]> generateHostList() {
    List<String[]> hostList = new ArrayList<String[]>();
    hostList.add(new String[] { "127.0.0.1", "20001" });
    hostList.add(new String[] { "127.0.0.1", "20002" });
    hostList.add(new String[] { "127.0.0.1", "20003" });

    Random rnd = new Random(System.currentTimeMillis());
    int num = rnd.nextInt(3) + 1;
    Collections.shuffle(hostList);
    return hostList.subList(0, num);
}

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From source file:com.linkedin.paldb.impl.GenerateTestData.java

public static Integer[] generateRandomIntKeys(int count, int range, long seed) {
    Random random = new Random(seed);
    Set<Integer> set = new HashSet<Integer>(count);
    while (set.size() < count) {
        set.add(random.nextInt(range));//  w ww  .j av  a2 s . c  o m
    }
    return set.toArray(new Integer[0]);
}

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From source file:com.rtg.alignment.SingleIndelEditDistanceTest.java

private static String randomDNA(final long seed, final int length) {
    final Random rand = new Random(seed);
    final StringBuilder sb = new StringBuilder();
    for (int i = 0; i < length; i++) {
        final int dna = rand.nextInt(4);
        final String dnac = DNA_STRINGS[dna];
        sb.append(dnac);//w w w .j ava2s .  co m
    }
    return sb.toString();
}

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From source file:enumj.EnumerableGenerator.java

public static Enumerable<EnumerableGenerator> generators() {
    final Random rnd = new Random(9691);
    return Enumerable.of(() -> Optional.of(new EnumerableGenerator(rnd.nextLong())));
}

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From source file:Main.java

public static void genRandom(long seed, int factor, int offset, int array[], int stride, int skip) {
    Random r = new Random(seed);
    for (int i = 0; i < array.length / stride; i++) {
        for (int j = 0; j < stride; j++) {
            if (j >= stride - skip)
                array[i * stride + j] = 0;
            else/*from ww  w  .  ja v  a  2 s.  com*/
                array[i * stride + j] = r.nextInt() * factor + offset;
        }
    }
}

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