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.tohours.imo.util.TohoursUtils.java

/**
 * ???/*from  ww  w  .  j a  v a2s  .  c  om*/
 * 
 * @param sLen
 * @return
 */
public static String randomKey(int sLen) {
    String base;
    String temp;
    int i;
    int p;

    base = "1234567890abcdefghijklmnopqrstuvwxyz";
    temp = "";
    for (i = 0; i < sLen; i++) {
        p = (int) (Math.random() * 37);
        if (p > 35)
            p = 35;
        temp += base.substring(p, p + 1);
    }
    return temp;
}

From source file:org.openhie.openempi.service.MailEngineTest.java

public void testSendMessageWithAttachment() throws Exception {
    final String ATTACHMENT_NAME = "boring-attachment.txt";

    //mock smtp server
    Wiser wiser = new Wiser();
    int port = 2525 + (int) (Math.random() * 100);
    mailSender.setPort(port);//  w  ww.  j a va  2  s  . c o m
    wiser.setPort(port);
    wiser.start();

    Date dte = new Date();
    String emailSubject = "grepster testSendMessageWithAttachment: " + dte;
    String emailBody = "Body of the grepster testSendMessageWithAttachment message sent at: " + dte;

    ClassPathResource cpResource = new ClassPathResource("/test-attachment.txt");
    mailEngine.sendMessage(new String[] { "foo@bar.com" }, mailMessage.getFrom(), cpResource, emailBody,
            emailSubject, ATTACHMENT_NAME);

    wiser.stop();
    assertTrue(wiser.getMessages().size() == 1);
    WiserMessage wm = wiser.getMessages().get(0);
    MimeMessage mm = wm.getMimeMessage();

    Object o = wm.getMimeMessage().getContent();
    assertTrue(o instanceof MimeMultipart);
    MimeMultipart multi = (MimeMultipart) o;
    int numOfParts = multi.getCount();

    boolean hasTheAttachment = false;
    for (int i = 0; i < numOfParts; i++) {
        BodyPart bp = multi.getBodyPart(i);
        String disp = bp.getDisposition();
        if (disp == null) { //the body of the email
            Object innerContent = bp.getContent();
            MimeMultipart innerMulti = (MimeMultipart) innerContent;
            assertEquals(emailBody, innerMulti.getBodyPart(0).getContent());
        } else if (disp.equals(Part.ATTACHMENT)) { //the attachment to the email
            hasTheAttachment = true;
            assertEquals(ATTACHMENT_NAME, bp.getFileName());
        } else {
            fail("Did not expect to be able to get here.");
        }
    }
    assertTrue(hasTheAttachment);
    assertEquals(emailSubject, mm.getSubject());
}

From source file:com.beetle.framework.util.OtherUtil.java

/**
 * Generates pseudo-random long from specific range. Generated number is
 * great or equals to min parameter value and less then max parameter value.
 * /*from   w  ww. j a  va 2 s .co  m*/
 * @param min
 *            lower (inclusive) boundary
 * @param max
 *            higher (exclusive) boundary
 * @return pseudo-random value
 */

public static long randomLong(long min, long max) {
    return min + (long) (Math.random() * (max - min));
}

From source file:ThreadDemo.java

/** This is the dummy method our threads all call */
static synchronized void compute() {
    // Figure out how many times we've been called by the current thread
    Integer n = (Integer) numcalls.get();
    if (n == null)
        n = new Integer(1);
    else/*from  ww  w . j av a  2  s  .  c  om*/
        n = new Integer(n.intValue() + 1);
    numcalls.set(n);

    // Display the name of the thread, and the number of times called
    System.out.println(Thread.currentThread().getName() + ": " + n);

    // Do a long computation, simulating a "compute-bound" thread
    for (int i = 0, j = 0; i < 1000000; i++)
        j += i;

    // Alternatively, we can simulate a thread subject to network or I/O
    // delays by causing it to sleep for a random amount of time:
    try {
        // Stop running for a random number of milliseconds
        Thread.sleep((int) (Math.random() * 100 + 1));
    } catch (InterruptedException e) {
    }

    // Each thread politely offers the other threads a chance to run.
    // This is important so that a compute-bound thread does not "starve"
    // other threads of equal priority.
    Thread.yield();
}

From source file:ar.org.neuroph.core.Weight.java

/**
 * Sets random weight value
 */
public void randomize() {
    this.value = Math.random() - 0.5d;
}

From source file:com.pivotal.gfxd.demo.controller.DemoController.java

@RequestMapping(value = "/random", produces = "application/json", method = RequestMethod.GET)
@ResponseBody//from www. j av  a  2 s. c  o  m
public ResponseEntity<TimestampValue> getRandom() {
    float rate = (float) ((Math.random() - 0.5) * 1000 + 5000);

    TimestampValue tv = new TimestampValue("event", System.currentTimeMillis() / 1000, rate);

    return new ResponseEntity(tv, HttpStatus.OK);
}

From source file:eu.databata.engine.util.PropagatorLock.java

private String generateToken() {
    return StringUtils.abbreviate("" + Math.random(), 200);
}

From source file:ListIt.java

public ListIt() {
    JFrame f = new JFrame();
    final PartsListModel pcm = new PartsListModel();
    ListCellRenderer lcr = new MyLabelRenderer();
    JList jl = new JList(pcm);
    jl.setCellRenderer(lcr);/*w w  w .  j  a va  2 s  . c om*/
    ListSelectionModel lsm = jl.getSelectionModel();
    lsm.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    jl.addListSelectionListener(new ListSelectionListener() {
        public void valueChanged(ListSelectionEvent e) {
            if (!e.getValueIsAdjusting()) {
                String element[] = (String[]) pcm.getElementAt(e.getFirstIndex());
                System.out.println(element[0] + " : " + element[1] + " : " + element[2]);
            }
        }
    });
    JScrollPane jsp = new JScrollPane(jl);
    JComboBox jc = new JComboBox(pcm);
    jc.setRenderer(lcr);
    JButton jb = new JButton("Add Merchandise");
    jb.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            pcm.addElement(partsList[(int) (Math.random() * partsList.length)]);
        }
    });
    Container c = f.getContentPane();
    c.add(jsp, BorderLayout.NORTH);
    c.add(jc, BorderLayout.CENTER);
    c.add(jb, BorderLayout.SOUTH);
    f.setSize(250, 250);
    f.show();
}

From source file:edu.ucla.stat.SOCR.chart.demo.LineChartDemo3.java

/**
 * creaets XYDataset/*from   ww  w .j  a v  a2s  . com*/
 *  @param isDemo true use the demo data, false use data from the JTable
 *  @return XYDataset
 */
protected XYDataset createDataset(boolean isDemo) {
    if (isDemo) {
        XYSeriesCollection dataset = new XYSeriesCollection();
        for (int i = 0; i < 4; i++) {
            XYSeries series = new XYSeries("S" + i);
            for (int j = 0; j < 4; j++) {
                series.add(j, Math.random() * 100);
            }
            dataset.addSeries(series);
        }
        return dataset;
    } else
        return super.createDataset(false);
}