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:com.balero.models.TestDAO.java

@Transactional
public void delete(int id) {
    Session session = sessionFactory.openSession();
    Test test = new Test();
    Double n = Math.random();
    test.setId(id);//  w  ww. j  a  v a  2 s  .  c  om
    session.delete(test);
    session.flush();
    session.close();
}

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From source file:org.jfree.chart.demo.SimpleIntervalXYDataset2.java

/**
 * Creates a new dataset.//w ww  . java2 s . c  o m
 * 
 * @param itemCount  the number of items to generate.
 */
public SimpleIntervalXYDataset2(final int itemCount) {

    this.xValues = new Double[itemCount];
    this.yStart = new Double[itemCount];
    this.yEnd = new Double[itemCount];

    double base = 100;
    for (int i = 1; i <= itemCount; i++) {
        this.xValues[i - 1] = new Double(i);
        base = base * (1 + (Math.random() / 10 - 0.05));
        this.yStart[i - 1] = new Double(base);
        this.yEnd[i - 1] = new Double(this.yStart[i - 1].doubleValue() + Math.random() * 30);
    }
}

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From source file:org.jfree.chart.demo.XYAreaChartDemo2.java

/**
 * Creates a new demo.//from   w  w w.j  a v  a  2s. com
 *
 * @param title  the frame title.
 */
public XYAreaChartDemo2(final String title) {

    super(title);

    final TimeSeries series1 = new TimeSeries("Random 1");
    double value = 0.0;
    Day day = new Day();
    for (int i = 0; i < 200; i++) {
        value = value + Math.random() - 0.5;
        series1.add(day, value);
        day = (Day) day.next();
    }

    final TimeSeriesCollection dataset = new TimeSeriesCollection(series1);

    final JFreeChart chart = createChart(dataset);

    final ChartPanel chartPanel = new ChartPanel(chart);
    chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
    setContentPane(chartPanel);

}

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From source file:org.jfree.chart.demo.ChartTiming3.java

/**
 * Runs the test.//from   w w  w.  java 2  s .  co  m
 */
public void run() {

    this.finished = false;

    // create a dataset...
    final XYSeries series = new XYSeries("Random Data");
    for (int i = 0; i < 1440; i++) {
        final double x = Math.random();
        final double y = Math.random();
        series.add(x, y);
    }
    final XYDataset data = new XYSeriesCollection(series);

    // create a scatter chart...
    final boolean withLegend = true;
    final JFreeChart chart = ChartFactory.createScatterPlot("Scatter plot timing", "X", "Y", data,
            PlotOrientation.VERTICAL, withLegend, false, false);

    final XYPlot plot = chart.getXYPlot();
    plot.setRenderer(new XYDotRenderer());

    final BufferedImage image = new BufferedImage(400, 300, BufferedImage.TYPE_INT_RGB);
    final Graphics2D g2 = image.createGraphics();
    final Rectangle2D chartArea = new Rectangle2D.Double(0, 0, 400, 300);

    // set up the timer...
    final Timer timer = new Timer(10000, this);
    timer.setRepeats(false);
    int count = 0;
    timer.start();
    while (!this.finished) {
        chart.draw(g2, chartArea, null, null);
        System.out.println("Charts drawn..." + count);
        if (!this.finished) {
            count++;
        }
    }
    System.out.println("DONE");

}

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From source file:org.bindgen.wicket.phonebook.DataGenerator.java

private int rint(int min, int max) {
    return (int) (Math.random() * (max - min) + min);
}

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From source file:com.ciphertool.genetics.algorithms.crossover.LiberalUnevaluatedCrossoverAlgorithm.java

/**
 * This crossover algorithm does a liberal amount of changes since it
 * replaces genes regardless of their begin and end sequence positions
 *///from   w  w  w  .j  av a  2 s . c om
public Chromosome performCrossover(Chromosome parentA, Chromosome parentB) {
    Chromosome child = parentA.clone();

    int childGeneIndex = 0;

    /*
     * Make sure we don't exceed parentB's index, or else we will get an
     * IndexOutOfBoundsException
     */
    while (childGeneIndex < child.getGenes().size() && childGeneIndex < parentB.getGenes().size()) {
        /*
         * Flip a coin to see if the current Gene should be replaced
         */
        if (((int) (Math.random() * 2)) == 0) {
            child.replaceGene(childGeneIndex, parentB.getGenes().get(childGeneIndex).clone());

            while (child.actualSize() < child.targetSize()) {
                child.addGene(geneListDao.findRandomGene(child, child.actualSize() - 1));
            }
        }

        childGeneIndex++;
    }

    /*
     * Trim the Chromosome in case it ends with too many sequences due to
     * the nature of this algorithm
     */
    chromosomeHelper.resizeChromosome(child);

    if (mutateDuringCrossover) {
        mutationAlgorithm.mutateChromosome(child);
    }

    // Don't return this child if it's identical to one of its parents
    if (child.equals(parentA) || child.equals(parentB)) {
        return null;
    }

    /*
     * Child is guaranteed to have at least as good fitness as its parent
     */
    return child;
}

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From source file:com.reelfx.controller.LinuxController.java

@Override
public void setupExtensions() {
    //super.setupExtensions();
    try {//  w  w  w .  jav a 2s.  co m
        if (!Applet.BIN_FOLDER.exists()) {
            // delete any old versions
            for (File file : Applet.BASE_FOLDER.listFiles()) {
                if (file.getName().startsWith("bin") && file.isDirectory()) {
                    FileUtils.deleteDirectory(file);
                    if (file.exists())
                        throw new Exception("Could not delete the old native extentions!");
                }
            }
            // download an install the new one
            String url = Applet.HOST_URL + File.separator + Applet.getBinFolderName() + ".jar?"
                    + Math.random() * 10000;
            Applet.copyFolderFromRemoteJar(new URL(url), Applet.getBinFolderName());
            if (!Applet.BIN_FOLDER.exists()) {
                logger.info("Could not find native extensions at " + url + ". Trying next code base url...");
                url = Applet.CODE_BASE.toString() + File.separator + Applet.getBinFolderName() + ".jar?"
                        + Math.random() * 10000;
                Applet.copyFolderFromRemoteJar(new URL(url), Applet.getBinFolderName());
                if (!Applet.BIN_FOLDER.exists()) {
                    logger.info("Could not find native extensions at " + url
                            + ". Trying next document base url...");
                    url = Applet.DOCUMENT_BASE.toString() + File.separator + Applet.getBinFolderName() + ".jar?"
                            + Math.random() * 10000;
                    Applet.copyFolderFromRemoteJar(new URL(url), Applet.getBinFolderName());
                    if (!Applet.BIN_FOLDER.exists()) {
                        throw new IOException(
                                "Did not copy Linux extensions to the execution directory! Last url: " + url);
                    }
                }
            }
            Runtime.getRuntime().exec("chmod 755 " + Applet.BIN_FOLDER + File.separator + "ffmpeg").waitFor();
            Runtime.getRuntime().exec("chmod 755 " + Applet.BIN_FOLDER + File.separator + "ffplay").waitFor();
        }
        logger.info("Have access to execution folder: " + Applet.BIN_FOLDER.getAbsolutePath());
        setReadyStateBasedOnPriorRecording();
    } catch (Exception e) { // possibilities: MalformedURL, InterriptedException, IOException
        Applet.sendViewNotification(ViewNotifications.FATAL, new MessageNotification("Error with install",
                "Sorry, an error occurred while installing the native extensions. Please contact an admin."));
        logger.error("Could not install native extensions", e);
    }
}

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From source file:baggage.BaseTestCase.java

protected byte[] makeRandomBytes(int howMany) {
    byte[] bytes = new byte[howMany];

    for (int i = 0; i < bytes.length; i++) {
        bytes[i] = (byte) (128d * Math.random());
    }//  w  w w .j  av a2s.  co m
    return bytes;
}

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From source file:UnsynchBankTest.java

public void run() {
    try {//w  w w  .  ja  v a2s . c  o  m
        while (true) {
            int toAccount = (int) (bank.size() * Math.random());
            double amount = maxAmount * Math.random();
            bank.transfer(fromAccount, toAccount, amount);
            Thread.sleep((int) (DELAY * Math.random()));
        }
    } catch (InterruptedException e) {
    }
}

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From source file:com.ideabase.repository.test.api.UserServiceTest.java

/**
 * Ensure user service can authenticate user credentials.
 * Successful authentication ended with a {@code User} profile object.
 *///from  w  w w  . ja  v  a2  s . co m
public void testLogin() {
    final String userName = "veryrandom-user" + Math.random();
    final String password = DigestUtils.shaHex("password is md5");

    // create user
    final Integer userId = TestCaseRepositoryHelper.fixCreateUser(mUserService, userName, password);

    // authenticate user
    final UserCredential userCredential = new UserCredential(userName, password);

    // authenticate user.
    final Subject subject = mUserService.login(userCredential);
    // retrieve user principal.
    final RepositoryUserPrincipal principal = subject.getPrincipals(RepositoryUserPrincipal.class).iterator()
            .next();

    // verify 
    assertNotNull("Authentication failed.", subject);
    assertNotNull("Authenticated user principal is null.", principal);
    assertNotNull("Authenticated user id is not attached with principal.", principal.getId());
    LOG.debug("Subject - " + subject);
}

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