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:eu.europeana.portal.portal2.speedtests.TermProvider.java

public static List<String> getRandomWords(int count) {

    List<String> queries = null;
    try {//  w w w .  j a v a 2s .  c om
        queries = FileUtils.readLines(new File("/home/peterkiraly/words.txt"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    List<String> random = new ArrayList<String>();
    String query;
    while (random.size() < count) {
        int startRecord = (int) (Math.random() * queries.size());
        query = queries.get(startRecord).trim().replaceAll("[\"'()]", "").replace("/", "\\/");
        if (query.length() >= 3 && !random.contains(query)) {
            random.add(query);
        }
    }

    return random;
}

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From source file:gov.nih.nci.caintegrator.application.zip.FileNameGenerator.java

public static String generateFileName(String userName) throws ValidationException {
    String fileName = null;/*from  w  w  w.j  a v a2  s.c  o m*/
    if (userName != null) {
        // Get a random number of up to 7 digits      
        int sevenDigitRandom = new Double(Math.random() * 10000000).intValue();

        // Get the last 7 digits of the Java timestamp
        String s = String.valueOf(System.currentTimeMillis());
        String lastSevenOfTimeStamp = s.substring(s.length() - 7, s.length());

        // Put it all together
        fileName = userName + "_" + sevenDigitRandom + lastSevenOfTimeStamp;
    } else {
        throw new ValidationException("Invalid Email Address");
    }
    return fileName;
}

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From source file:Main.java

/**
 * A convenience method that generates a XOR key pair for a given key. It was used to generate
 * the key for {@link MainActivity#useXorStringHiding(String)} method.
 *
 * @param key The source key to use in generating the XOR key halves
 * @return a two-value string array containing both parts of the XOR key
 *//*from  w ww.j a  v  a 2  s. c  o m*/
public static String[] generateKeyXorParts(String key) {
    String[] keyParts = new String[2];

    byte[] xorRandom = new byte[key.length()];
    byte[] xorMatch = new byte[key.length()];
    byte[] keyBytes = key.getBytes();
    for (int i = 0; i < key.length(); i++) {
        xorRandom[i] = (byte) (256 * Math.random());
        xorMatch[i] = (byte) (xorRandom[i] ^ keyBytes[i]);
    }
    keyParts[0] = Base64.encodeToString(xorRandom, 0);
    keyParts[1] = Base64.encodeToString(xorMatch, 0);
    Log.i(TAG, "XOR Key Part 0: " + keyParts[0]);
    Log.i(TAG, "XOR Key Part 1: " + keyParts[1]);

    return keyParts;
}

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From source file:Main.java

public static <T> T random(T[] array) {
    return array[(int) Math.floor(Math.random() * array.length)];
}

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From source file:Main.java

public static int randRange(int min, int max) {
    return min + (int) (Math.random() * ((max - min) + 1));
}

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From source file:ttma.client.GUI.StatOperations.java

private static PieDataset createDataset() {
    int i = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    int i1 = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    int i2 = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    int i3 = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    int i4 = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    int i5 = 100 + (int) (Math.random() * ((2000 - 100) + 1));
    DefaultPieDataset dataset = new DefaultPieDataset();
    // GestionConge g = new GestionConge();
    //dataset.setValue( "  CONGE ACCEPTE   :  '"+g.countCongeAccpte()+"'" ,g.countCongeAccpte());  
    //dataset.setValue( " CONGE REFUSE   :  '"+g.countCongeRefuse()+"'"  ,g.countCongeRefuse() );   
    //dataset.setValue( "  CONGE SANS REPONSE   :  '"+g.countCongeSansRep()+"'" ,g.countCongeSansRep());  
    dataset.setValue("  Face Surgery   :", i);
    dataset.setValue("  Breast Surgery   :  ", i1);
    dataset.setValue("  Surgery teeth   ", i2);
    dataset.setValue("  Surgery plastic  ", i3);
    dataset.setValue("  intimate Surgery  ", i4);
    dataset.setValue("  gastric Band  ", i5);

    return dataset;
}

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From source file:Main.java

public static String generateNickname() {
    Random rnd = new Random(System.currentTimeMillis());
    int race_selection = rnd.nextInt(3);

    String thefirstname = "";
    String thelastname = "";
    String thefirstname1 = "";
    String thelastname1 = "";

    if (race_selection == 0) {
        double fnprefix1 = Math.floor(Math.random() * 122);
        double fnsuffix1 = Math.floor(Math.random() * 91);
        double lnprefix1 = Math.floor(Math.random() * 67);
        double lnsuffix1 = Math.floor(Math.random() * 64);

        thefirstname = h_fnpre.get((int) fnprefix1) + h_fnsuf.get((int) fnsuffix1);
        thelastname = h_lnpre.get((int) lnprefix1) + h_lnsuf.get((int) lnsuffix1);

        thefirstname1 = thefirstname.substring(0, 1).toUpperCase();
        thefirstname = thefirstname1 + thefirstname.substring(1, thefirstname.length());

        thelastname1 = thelastname.substring(0, 1).toUpperCase();
        thelastname = thelastname1 + thelastname.substring(1, thelastname.length());

    } else if (race_selection == 0) {
        double fnprefix1 = Math.floor(Math.random() * 80);
        double fnsuffix1 = Math.floor(Math.random() * 67);

        thefirstname = o_fnpre.get((int) fnprefix1) + o_fnsuf.get((int) fnsuffix1);
        thelastname = "";

    } else {/* w  ww  .j a  v a 2s. c o m*/
        double fnprefix1 = Math.floor(Math.random() * 122);
        double fnsuffix1 = Math.floor(Math.random() * 91);

        thefirstname = h_fnpre.get((int) fnprefix1) + h_fnsuf.get((int) fnsuffix1);

    }

    return thefirstname + " " + thelastname;
}

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From source file:Main.java

public static boolean isAnimatable(View view) {
    return Math.random() >= 0;
}

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From source file:Main.java

/**
 * Will return a list of random location from the given position & radius
 * @param amount/*from w  w w .jav a  2s  .  c  o  m*/
 * @param lat
 * @param lng
 * @param radius
 * @return ArrayList<Location> 
 */
public static ArrayList<Location> randomLocations(int amount, double lat, double lng, double radius) {
    ArrayList<Location> locations = new ArrayList<Location>(0);
    Location centerLocation = new Location("local");
    centerLocation.setLatitude(lat);
    centerLocation.setLongitude(lng);

    final double lngScale = Math.cos((Math.PI / 180.0) * lat);
    final double radiusDeg = radius / 111.2; // radius converted to degrees (square)

    while (locations.size() < amount) {
        Location l = new Location("local");
        double dLat = (Math.random() * radiusDeg * 2) - radiusDeg;
        double dLng = (Math.random() * radiusDeg * 2 / lngScale) - (radiusDeg / lngScale);

        l.setLatitude(centerLocation.getLatitude() + dLat);
        l.setLongitude(centerLocation.getLongitude() + dLng);
        double dist = l.distanceTo(centerLocation) / 1000.0;

        if (dist < (radius)) {
            locations.add(l);
        }
    }
    return locations;
}

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From source file:Main.java

private static String generatePrefixForNamespace(String namespaceURI) {
    return "ns" + (int) (Math.random() * 1000);
}

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