Example usage for java.lang Math random

Introduction

In this page you can find the example usage for java.lang Math random.

Prototype

public static double random() 

Source Link

Document

Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0 .

Usage

From source file:junglespeed.service.ConfigService.java

public void distributionCartes(Partie partie) {

    map.put(1, "BLUE");
    map.put(2, "RED");
    map.put(3, "YELLOW");
    map.put(4, "GREEN");
    map.put(5, "GREY");
    map.put(6, "WHITE");
    map.put(7, "BLACK");
    map.put(8, "BLUE");

    int lower = 1;
    int higher = 8;

    for (Joueur joueur : partie.getJoueurs()) {
        for (int i = 0; i < nbCartes; i++) {
            int random = (int) (Math.random() * (higher - lower + 1)) + lower;
            Carte carte = new Carte(map.get(random), joueur);
            joueur.getCartes().add(carte);
            carteService.save(carte);//  ww  w  .j a v  a  2  s  .  co  m
            joueurService.save(joueur);
        }
    }
}

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From source file:edu.umass.cs.protocoltask.examples.pingpong.PingPongProtocolTask.java

@Override
public String refreshKey() {
    return (this.key = (this.myID.toString() + (int) (Math.random() * Integer.MAX_VALUE)));
}

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From source file:edu.ucsf.valelab.saim.calculations.TestSaimFitter.java

public void test() throws Exception {
    double wavelength = 488.0;
    double nSample = 1.36;
    double dOx = 500.0;

    double A = 100.0;
    double B = 100.0;
    double h = 16.0;

    double fractionMaxError = 0.0000001;
    final int nrTries = 10;

    // make a collection of "observed" points
    ArrayList<WeightedObservedPoint> points = new ArrayList<WeightedObservedPoint>();
    for (int i = -50; i <= 50; i += 2) {
        double angle = Math.toRadians(i);
        double I = A * SaimCalc.fieldStrength(wavelength, angle, nSample, dOx, h) + B;
        WeightedObservedPoint point = new WeightedObservedPoint(1.0, angle, I);
        points.add(point);/*from   w  w  w  . java  2 s.  c  o m*/
    }

    // create the fitter
    SaimFunctionFitter sff = new SaimFunctionFitter(wavelength, dOx, nSample, false);
    double[] values = new double[] { A, B, h };

    // test by varying the input for height
    for (int i = 0; i < nrTries; i++) {
        double[] guess = values.clone();
        guess[0] = 50.0;
        guess[1] = 150.0;
        guess[2] = guess[2] + (guess[2] * (Math.random() - 0.5) * 10);
        if (guess[2] < 1.0)
            guess[2] = 1.0;
        for (int j = 0; j < guess.length; j++) {
            System.out.println("Guess: " + j + " " + guess[j]);
        }

        sff.setGuess(guess);

        final double[] coefficients = sff.fit(points);
        for (int j = 0; j < coefficients.length; j++) {
            System.out
                    .println("coefficient " + j + ", expected:  " + values[j] + ", found: " + coefficients[j]);
            assertEquals(values[j], coefficients[j], values[j] * fractionMaxError);
        }

        System.out.println("Value was calculated: " + sff.getCalcCount() + " times");
        sff.resetCalcCount();
    }

    // test by adding noise to the input
    // make a collection of "observed" points
    final double noiseFactor = 0.1; // 10% noise
    fractionMaxError = noiseFactor;

    double[] guess = values.clone();
    guess[0] = 50.0;
    guess[1] = 150.0;
    guess[2] = 50.0;
    for (int j = 0; j < guess.length; j++) {
        System.out.println("Guess: " + j + " " + guess[j]);
    }

    for (int i = 0; i < nrTries; i++) {
        ArrayList<WeightedObservedPoint> noisyPoints = new ArrayList<WeightedObservedPoint>();
        for (int j = -50; j <= 50; j += 2) {
            double angle = Math.toRadians(j);
            double I = A * SaimCalc.fieldStrength(wavelength, angle, nSample, dOx, h) + B;
            WeightedObservedPoint noisyPoint = new WeightedObservedPoint(1.0, angle,
                    I + I * (Math.random() - 0.5) * noiseFactor);
            noisyPoints.add(noisyPoint);
        }

        sff.setGuess(guess);

        final double[] coefficients = sff.fit(noisyPoints);
        for (int j = 0; j < coefficients.length; j++) {
            System.out
                    .println("coefficient " + j + ", expected:  " + values[j] + ", found: " + coefficients[j]);
            assertEquals(values[j], coefficients[j], values[j] * fractionMaxError);
        }

        System.out.println("Value was calculated: " + sff.getCalcCount() + " times");
        sff.resetCalcCount();
    }

}

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From source file:com.mpush.test.client.ConnClientTestMain.java

private static void testConnClient(int count, String userPrefix, int printDelay, boolean sync)
        throws Exception {
    Logs.init();/*from w  w w  .j  a  v a 2s  . co  m*/
    ConnClientBoot boot = new ConnClientBoot();
    boot.start().get();

    List<ServiceNode> serverList = boot.getServers();
    if (serverList.isEmpty()) {
        boot.stop();
        System.out.println("no mpush server.");
        return;
    }

    if (printDelay > 0) {
        Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(
                () -> System.err.println(ConnClientChannelHandler.STATISTICS), 3, printDelay, TimeUnit.SECONDS);
    }

    for (int i = 0; i < count; i++) {
        String clientVersion = "1.0." + i;
        String osName = "android";
        String osVersion = "1.0.1";
        String userId = userPrefix + "user-" + i;
        String deviceId = userPrefix + "test-device-id-" + i;
        byte[] clientKey = CipherBox.I.randomAESKey();
        byte[] iv = CipherBox.I.randomAESIV();

        ClientConfig config = new ClientConfig();
        config.setClientKey(clientKey);
        config.setIv(iv);
        config.setClientVersion(clientVersion);
        config.setDeviceId(deviceId);
        config.setOsName(osName);
        config.setOsVersion(osVersion);
        config.setUserId(userId);

        int L = serverList.size();
        int index = (int) ((Math.random() % L) * L);
        ServiceNode node = serverList.get(index);

        ChannelFuture future = boot.connect(node.getAttr(ATTR_PUBLIC_IP), node.getPort(), config);
        if (sync)
            future.awaitUninterruptibly();
    }
}

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From source file:baggage.BaseTestCase.java

protected long randomLong() {
    return (long) (Math.random() * 100000d);
}

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From source file:net.sf.ipsedixit.core.impl.DefaultDataProvider.java

/**
 * {@inheritDoc}/*from w w w  .  jav a 2s  .co  m*/
 */
public double randomDoubleInRange(double minInclusive, double maxExclusive) {
    return (Math.random() * (maxExclusive - minInclusive)) + minInclusive;
}

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From source file:edu.ucsf.valelab.saim.calculations.TestSaimErrorFunctionFitter.java

public void test() throws Exception {
    SaimData data = new SaimData();

    data.wavelength_ = 488.0;/* w w w . ja  va 2  s . com*/
    data.nSample_ = 1.36;
    data.dOx_ = 500.0;
    data.A_ = 1000.0;
    data.B_ = 5000.0;
    data.heights_ = new double[] { 75.0 };

    double maxError = 0.00000000001;
    int nrRepeats = 5;

    // make a collection of "observed" points
    ArrayList<WeightedObservedPoint> points = new ArrayList<WeightedObservedPoint>();
    for (int i = -50; i <= 50; i += 1) {
        double angle = Math.toRadians(i);
        double I = data.A_
                * SaimCalc.fieldStrength(data.wavelength_, angle, data.nSample_, data.dOx_, data.heights_[0])
                + data.B_;
        WeightedObservedPoint point = new WeightedObservedPoint(1.0, angle, I);
        points.add(point);
    }
    System.out.println("BOBYQA Test results (TestSaimErrorFunctionFitter:");
    System.out.println("Goal: " + data.A_ + ", " + data.B_ + ", " + data.heights_[0]);

    for (int i = 0; i < nrRepeats; i++) {
        SaimErrorFunctionFitter sef = new SaimErrorFunctionFitter(data);
        double[] guess = { Math.random() * 4000.0, Math.random() * 10000.0, Math.random() * 300.0 };
        sef.setGuess(guess);
        double[] result = sef.fit(points);
        System.out.println("Guess: " + guess[0] + ", " + guess[1] + ", " + guess[2]);
        System.out.println("Result: " + result[0] + ", " + result[1] + ", " + result[2]);

    }
}

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From source file:Retailer.java

public void run() {
    ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, url);
    try {/*w  ww. j  a v a  2s. c  o m*/
        Connection connection = connectionFactory.createConnection();

        // The Retailer's session is non-trasacted.
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination vendorOrderQueue = session.createQueue("VendorOrderQueue");
        TemporaryQueue retailerConfirmQueue = session.createTemporaryQueue();

        MessageProducer producer = session.createProducer(vendorOrderQueue);
        MessageConsumer replyConsumer = session.createConsumer(retailerConfirmQueue);

        connection.start();

        for (int i = 0; i < 5; i++) {
            MapMessage message = session.createMapMessage();
            message.setString("Item", "Computer(s)");
            int quantity = (int) (Math.random() * 4) + 1;
            message.setInt("Quantity", quantity);
            message.setJMSReplyTo(retailerConfirmQueue);
            producer.send(message);
            System.out.println("Retailer: Ordered " + quantity + " computers.");

            MapMessage reply = (MapMessage) replyConsumer.receive();
            if (reply.getBoolean("OrderAccepted")) {
                System.out.println("Retailer: Order Filled");
            } else {
                System.out.println("Retailer: Order Not Filled");
            }
        }

        // Send a non-MapMessage to signal the end
        producer.send(session.createMessage());

        replyConsumer.close();
        connection.close();

    } catch (JMSException e) {
        e.printStackTrace();
    }
}

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From source file:org.smigo.user.UserHandler.java

public User createUser() {
    for (int tries = 0; tries < 5; tries++) {
        String username = "user" + (int) (Math.random() * 1000000);
        final List<User> users = userDao.getUsersByUsername(username);
        if (users.size() == 0) {
            final Locale locale = getLocale();
            return createUser(username, null, locale, false);
        }//w w  w.  j a va  2 s.  co m
    }
    throw new IllegalStateException("Tried 5 times and could not find a free username");
}

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From source file:SortItem.java

/**
 * Fill the array with random numbers from 0..n-1.
 *///from   ww w.j  av a2 s  .  c o  m
void scramble() {
    int[] a = new int[size().height / 2];
    double f = size().width / (double) a.length;
    for (int i = a.length; --i >= 0;) {
        a[i] = (int) (i * f);
    }
    for (int i = a.length; --i >= 0;) {
        int j = (int) (i * Math.random());
        int t = a[i];
        a[i] = a[j];
        a[j] = t;
    }
    arr = a;
}

---

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