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()

Source Link

Document

Creates a new random number generator.

Usage

From source file:Main.java

public static int getRandom(int max) {
    if (random == null)
        random = new Random();
    return random.nextInt(max);
}

From source file:Main.java

public static long initRandomSerial() {
    final Random rnd = new Random();
    rnd.setSeed(System.currentTimeMillis());
    // prevent browser certificate caches, cause of doubled serial numbers
    // using 48bit random number
    long sl = ((long) rnd.nextInt()) << 32 | (rnd.nextInt() & 0xFFFFFFFFL);
    // let reserve of 16 bit for increasing, serials have to be positive
    sl = sl & 0x0000FFFFFFFFFFFFL;//w  w w .j  a v a  2 s  .  co  m
    return sl;
}

From source file:Main.java

public static Pair<Integer, Integer> randomBalanceAndAccountNumbers() {
    Random random = new Random();
    Integer balance = random.nextInt(80000);
    Integer account = 10000000 + random.nextInt(90000000);

    return Pair.create(balance, account);
}

From source file:Main.java

public static double getRandomDouble(double max) throws Exception {
    double ret;/* w w w . j  av a2s  . c  o m*/
    Random r = new Random();
    ret = r.nextDouble() * max;

    return ret;
}

From source file:Main.java

private static ByteBuffer buffer(int len) {
    byte[] b = new byte[len];
    Random r = new Random();
    r.nextBytes(b);/*  ww w. jav  a  2 s  .  c  o m*/
    return ByteBuffer.wrap(b);
}

From source file:Main.java

public static int randomRGB() {
    String r, g, b;//from   w  ww.  j a v a 2  s  .  co m
    Random random = new Random();
    r = Integer.toHexString(random.nextInt(256)).toUpperCase();
    g = Integer.toHexString(random.nextInt(256)).toUpperCase();
    b = Integer.toHexString(random.nextInt(256)).toUpperCase();
    r = r.length() == 1 ? "0" + r : r;
    g = g.length() == 1 ? "0" + g : g;
    b = b.length() == 1 ? "0" + b : b;
    return Color.parseColor("#" + (r + g + b));
}

From source file:Main.java

private static String genRandomString(int pLength) {
    Random r = new Random();
    String letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < pLength; i++) {
        sb.append(letter.charAt(r.nextInt(1000000) % (letter.length())));
    }/* ww w  .j a  va  2  s  .c  o m*/
    return sb.toString();
}

From source file:Main.java

public static String generateString(int length) {
    StringBuffer sb = new StringBuffer();
    Random random = new Random();
    for (int i = 0; i < length; i++) {
        sb.append(random.nextInt());//from  www  .j  a v a 2 s  .  c  o m
    }
    return sb.toString();
}

From source file:Main.java

public static String getNonce() {
    String base = "abcdefghijklmnopqrstuvwxyz0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < 18; i++) {
        int number = random.nextInt(base.length());
        sb.append(base.charAt(number));//from   w w w.  j av  a 2s .  c  om
    }
    return sb.toString();
}

From source file:Main.java

/**
 *
 * @param len/*  w  w  w . j  a v  a  2 s.  c  o m*/
 * @return
 */
public static String getRandomHex(int len) {
    Random r = new Random();
    StringBuffer sb = new StringBuffer();
    while (sb.length() < len) {
        sb.append(Integer.toHexString(r.nextInt()));
    }
    return sb.toString().substring(0, len).toUpperCase();
}