Example usage for java.util Random Random

Introduction

In this page you can find the example usage for java.util Random Random.

Prototype

public Random(long seed)

Source Link

Document

Creates a new random number generator using a single long seed.

Usage

From source file:Clases.Encriptar.java

public static String getCadenaAleatoria(int longitud) {//microtime
    String cadenaAleatoria = "";
    long milis = new java.util.GregorianCalendar().getTimeInMillis();
    Random r = new Random(milis);
    int i = 0;//  w w  w . j  ava2  s  .  co m
    while (i < longitud) {
        char c = (char) r.nextInt(255);
        if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c == '$')
                || (c == '_')) {
            cadenaAleatoria += c;
            i++;
        }
    }
    return cadenaAleatoria;
}

From source file:Main.java

/**
 * Generates a random byte and returns it as a hexadecimal string.
 *
 * @return A random byte as hexadecimal string.
 *//* www . j  ava  2  s  .c  o  m*/
public static String generatedRandomByteAsHexString() {
    if (mRandom == null) {
        mRandom = new Random(new Date().getTime());
    }

    int randomInt8 = mRandom.nextInt(256);
    return Integer.toHexString(randomInt8);
}

From source file:net.kazyx.wirespider.TestUtil.java

public static byte[] fixedLengthRandomByteArray(int length) {
    System.out.println("Create random byte array: " + length);
    byte[] ba = new byte[length];
    Random rnd = new Random(20L);
    rnd.nextBytes(ba);/*from   w w  w  .j av a 2 s  .co  m*/
    return ba;
}

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 {/*from w  w  w  .  j  a  v  a 2  s .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;
}

From source file:MainClass.java

private static void fillArray(Object array) {
    int length = Array.getLength(array);
    Random generator = new Random(System.currentTimeMillis());
    for (int i = 0; i < length; i++) {
        int random = generator.nextInt();
        Array.setInt(array, i, random);
    }//  w  w  w  . j a  v a  2  s. c o  m
}

From source file:Main.java

public static void genRandom(long seed, int factor, int offset, float array[]) {
    Random r = new Random(seed);
    for (int i = 0; i < array.length; i++) {
        array[i] = r.nextFloat() * factor + offset;
    }// ww  w . j  a va 2 s.  co m
}

From source file:Main.java

public static int randomInt(int min, int max) {
    Random random = new Random(System.currentTimeMillis());
    return min + random.nextInt(max - min);
}

From source file:com.fengduo.bee.commons.core.utils.Identities.java

/**
 * ??n?/*from  w  ww  .j a v  a2  s  .  com*/
 */
public static String randomNum(int n) {
    Random r = new Random(System.currentTimeMillis());
    StringBuffer buf = new StringBuffer(n);
    for (int i = 0; i < n; i++) {
        buf.append(r.nextInt(10));
    }
    return buf.toString();
}

From source file:Main.java

/**
 * Fills the array with random ints.  Values will be between min (inclusive) and
 * max (inclusive)./*ww  w.j a  v a2 s.co m*/
 */
public static void genRandomInts(long seed, int min, int max, int array[]) {
    Random r = new Random(seed);
    for (int i = 0; i < array.length; i++) {
        long range = max - min + 1;
        array[i] = (int) (min + r.nextLong() % range);
    }
    array[r.nextInt(array.length)] = min;
    array[r.nextInt(array.length)] = max;
}

From source file:org.jfree.chart.demo.HistogramDemo1.java

private static IntervalXYDataset createDataset() {
    HistogramDataset histogramdataset = new HistogramDataset();
    double ad[] = new double[1000];
    Random random = new Random(0xbc614eL);
    for (int i = 0; i < 1000; i++)
        ad[i] = random.nextGaussian() + 5D;

    histogramdataset.addSeries("H1", ad, 100, 2D, 8D);
    ad = new double[1000];
    for (int j = 0; j < 1000; j++)
        ad[j] = random.nextGaussian() + 7D;

    histogramdataset.addSeries("H2", ad, 100, 4D, 10D);
    return histogramdataset;
}