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:gov.jgi.meta.hadoop.input.FastaBlockLineReader.java

public static void main(String[] args) {

    int num = 1;/*from   w  ww .  j a v  a  2  s  . c o m*/
    int last = -1;

    do {
        try {
            FileInputStream fstream = new FileInputStream("/scratch/karan/30mb.fas");
            FastaBlockLineReader fblr = new FastaBlockLineReader(fstream);

            Text key = new Text();
            Map<String, String> setofreads = new HashMap<String, String>();
            Map<String, String> setofreadsTotal = new HashMap<String, String>();
            int length = (int) (Math.random() * 10000);
            length = 3000000;
            System.out.println("lenght = " + length);

            int total = 0;

            fblr.readLine(key, setofreads, Integer.MAX_VALUE, length);
            //            System.out.println("setofreads.size = " + setofreads.size());
            total += setofreads.size();
            //for (String s : setofreads.keySet()) {
            //                System.out.println(s);
            //            }
            Runtime r = Runtime.getRuntime();
            while (setofreads.size() > 0) {
                setofreadsTotal.putAll(setofreads);
                setofreads.clear();
                fblr.readLine(key, setofreads, Integer.MAX_VALUE, length);
                //              System.out.println("setofreads.size = " + setofreads.size());
                total += setofreads.size();

                r.gc();
            }
            System.out.println("total = " + total);
            System.out.println("heap size = " + r.totalMemory() / 1048576);

            if (last != -1) {
                if (last != total) {
                    System.out.println(
                            "error!!!, length = " + length + ": last = " + last + " current = " + total);
                }
            }
            last = total;

        } catch (Exception e) {
            System.out.println(e);
        }
    } while (num-- > 0);

}

---

From source file:Main.java

/**
 * This method generates a random n digit password, which contains at least one number, lower case alphabet, upper
 * case alphabet and as special character.
 *//*from   w ww.jav a2  s.c  o  m*/
public static String generatePassword(int n) {

    Random rd = new Random();

    char lowerChars[] = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    char upperChars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
    char numbers[] = "0123456789".toCharArray();
    char specialChars[] = "~!@#$%^&*()-_=+[{]}|;:<>/?".toCharArray();

    List<Character> pwdLst = new ArrayList<Character>();
    for (int g = 0; g < 4; g++) {
        for (int z = 0; z < 1; z++) {
            if (g == 0) {
                pwdLst.add(numbers[rd.nextInt(10)]);
            } else if (g == 1) {
                pwdLst.add(lowerChars[rd.nextInt(26)]);
            } else if (g == 2) {
                pwdLst.add(upperChars[rd.nextInt(26)]);
            } else if (g == 3) {
                pwdLst.add(specialChars[rd.nextInt(26)]);
            }
        }
        if (pwdLst.size() == n) {
            break;
        }
        if (g + 1 == 4) {
            g = (int) Math.random() * 5;

        }
    }
    StringBuilder password = new StringBuilder();
    Collections.shuffle(pwdLst);
    for (int c = 0; c < pwdLst.size(); c++) {
        password.append(pwdLst.get(c));
    }
    return password.toString();
}

---

From source file:Main.java

public String getAlphaNumeric(int len) {
    StringBuffer sb = new StringBuffer(len);
    for (int i = 0; i < len; i++) {
        int ndx = (int) (Math.random() * ALPHA_NUM.length());
        sb.append(ALPHA_NUM.charAt(ndx));
    }// ww w.j  a  va  2  s .c o  m
    return sb.toString();
}

---

From source file:Main.java

public static int[] shuffle(int[] arr) {
    for (int i = arr.length - 1; i >= 0; --i) {
        // swap indexes
        int r = (int) Math.rint(Math.random() * i);
        int t = arr[i];
        arr[i] = arr[r];//w w  w.j av a 2 s  .  c o  m
        arr[r] = t;
    }

    return arr;
}

---

From source file:br.com.diegosilva.jsfcomponents.util.Utils.java

public static int generateRandomNumber() {
    return (int) Math.round(1 + (Math.random() * 1000000));
}

---

From source file:br.on.daed.services.pdf.DadosMagneticos.java

public static byte[] gerarPDF(String ano, String tipo)
        throws IOException, InterruptedException, UnsupportedOperationException {

    File tmpFolder;/*from   w w w . ja  va2  s  .c  o  m*/
    String folderName;

    Double anoDouble = Double.parseDouble(ano);
    List<String> dados = Arrays.asList(TIPO_DADOS_MAGNETICOS);

    byte[] ret = null;

    if (anoDouble >= ANO_MAGNETICO[0] && anoDouble < ANO_MAGNETICO[1] && dados.contains(tipo)) {

        do {

            folderName = "/tmp/dislin" + Double.toString(System.currentTimeMillis() * Math.random());
            tmpFolder = new File(folderName);

        } while (tmpFolder.exists());

        tmpFolder.mkdir();

        ProcessBuilder processBuilder = new ProcessBuilder("/opt/declinacao-magnetica/./gerar", ano, tipo);

        processBuilder.directory(tmpFolder);

        processBuilder.environment().put("LD_LIBRARY_PATH", "/usr/local/dislin");

        Process proc = processBuilder.start();

        proc.waitFor();

        ProcessHelper.outputProcess(proc);

        File arquivoServido = new File(folderName + "/dislin.pdf");

        FileInputStream fis = new FileInputStream(arquivoServido);

        ret = IOUtils.toByteArray(fis);

        processBuilder = new ProcessBuilder("rm", "-r", folderName);

        tmpFolder = new File("/");

        processBuilder.directory(tmpFolder);

        Process delete = processBuilder.start();

        delete.waitFor();

    } else {
        throw new UnsupportedOperationException("Entrada invlida");
    }
    return ret;
}

---

From source file:com.puppetlabs.geppetto.forge.v2.api.it.ReleaseTestCreate.java

@BeforeClass
public static void initialize() {
    String rnd = "000" + Integer.toString((int) (Math.random() * 10000));
    testModule = ForgeAPITestBase.TEST_MODULE_PFX + rnd.substring(rnd.length() - 4);
}

---

From source file:org.jfree.chart.demo.GridBandDemo1.java

public static JPanel createDemoPanel() {
    XYSeries xyseries = new XYSeries("Random Data");
    for (int i = 0; i < 100; i++)
        xyseries.add(Math.random() + 1.0D, Math.random() + 1.0D);

    XYSeriesCollection xyseriescollection = new XYSeriesCollection();
    xyseriescollection.addSeries(xyseries);
    JFreeChart jfreechart = createChart(xyseriescollection);
    ChartPanel chartpanel = new ChartPanel(jfreechart);
    return chartpanel;
}

---

From source file:org.jfree.chart.demo.DeviationRendererDemo2.java

private static XYDataset createDataset() {
    YIntervalSeries series1 = new YIntervalSeries("Series 1");
    YIntervalSeries series2 = new YIntervalSeries("Series 2");
    Object obj = new Week();
    double d = 100D;
    double d1 = 100D;
    for (int i = 0; i <= 52; i++) {
        double d2 = 0.050000000000000003D * (double) i;
        series1.add(((RegularTimePeriod) (obj)).getFirstMillisecond(), d, d - d2, d + d2);
        d = (d + Math.random()) - 0.45000000000000001D;
        double d3 = 0.070000000000000007D * (double) i;
        series2.add(((RegularTimePeriod) (obj)).getFirstMillisecond(), d1, d1 - d3, d1 + d3);
        d1 = (d1 + Math.random()) - 0.55000000000000004D;
        obj = ((RegularTimePeriod) (obj)).next();
    }//  ww w  . j a v a 2  s  .  co  m

    YIntervalSeriesCollection dataset = new YIntervalSeriesCollection();
    dataset.addSeries(series1);
    dataset.addSeries(series2);
    return dataset;
}

---

From source file:org.jfree.chart.demo.CompassFormatDemo1.java

private static XYDataset createDirectionDataset(int i) {
    TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
    TimeSeries timeseries = new TimeSeries("Wind Direction");
    Object obj = new Minute();
    double d = 180D;
    for (int j = 0; j < i; j++) {
        timeseries.add(((RegularTimePeriod) (obj)), d);
        obj = ((RegularTimePeriod) (obj)).next();
        d += (Math.random() - 0.5D) * 15D;
        if (d < 0.0D) {
            d += 360D;/*from  ww  w .  ja va 2  s.c o m*/
            continue;
        }
        if (d > 360D)
            d -= 360D;
    }

    timeseriescollection.addSeries(timeseries);
    return timeseriescollection;
}

---

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