Example usage for java.util Random nextInt

Introduction

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

Prototype

public int nextInt(int bound)

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

From source file:Main.java

public static String generateRandomString(int len) {
    String str = "0123456789abcdefghijklmnopqrstuvwxyz";
    Random rnd = new Random();
    StringBuilder sb = new StringBuilder(len);
    for (int i = 0; i < len; i++) {
        sb.append(str.charAt(rnd.nextInt(str.length())));
    }/*w w w.  j a v  a 2 s .  c o  m*/
    return sb.toString();
}

From source file:Main.java

public static String getRandomKey(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();

    for (int i = 0; i < length; ++i) {
        int number = random.nextInt(str.length() - 1);//[0,62)

        sb.append(str.charAt(number));/*w w  w .j a v a  2s .  c  o  m*/
    }
    return sb.toString();
}

From source file:Main.java

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

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 . ja v a  2 s .  c om*/
        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:Main.java

public static String generateRandom() {
    Random number = new Random();
    StringBuilder message = new StringBuilder();
    for (int i = 0; i < 1405; i++) {
        message.append('a' + number.nextInt(52));
    }// w  w w. j  a v a 2 s  . c o m
    return message.toString();
}

From source file:net.dovemq.transport.link.LinkTestUtils.java

public static CAMQPMessage createMessage(Random randomGenerator) {
    String deliveryTag = UUID.randomUUID().toString();
    int sectionSize = 256 * (randomGenerator.nextInt(10) + 1);
    String str = RandomStringUtils.randomAlphanumeric(sectionSize);
    CAMQPMessagePayload payload = new CAMQPMessagePayload(str.getBytes());
    return new CAMQPMessage(deliveryTag, payload);
}

From source file:Main.java

public static <T> java.util.List<T> randomSample(java.util.List<T> items, int size) {
    size = Math.min(size, items.size());
    java.util.Random rnd = new java.util.Random();
    for (int i = 0; i < size; i++) {
        int pos = i + rnd.nextInt(items.size() - i);
        T tmp = items.get(pos);//from  www .  j a  v  a2  s .c  o m
        items.set(pos, items.get(i));
        items.set(i, tmp);
    }
    return items.subList(0, size);
}

From source file:Main.java

public static int randInt(int min, int max) {

    // Usually this should be a field rather than a method variable so
    // that it is not re-seeded every call.
    Random rand = new Random();

    // nextInt is normally exclusive of the top value,
    // so add 1 to make it inclusive
    int randomNum = rand.nextInt((max - min) + 1) + min;

    return randomNum;
}

From source file:Test.java

private static void startUpdatingThread(final List<String> list) {
    updatingThread = new Thread(new Runnable() {
        long counter = 0;

        public void run() {
            while (!Thread.interrupted()) {
                int size = list.size();
                Random random = new Random();
                if (random.nextBoolean()) {
                    if (size > 1) {
                        list.remove(random.nextInt(size - 1));
                    }// ww  w .  j  a v  a  2 s.c o m
                } else {
                    if (size < 20) {
                        list.add("Random string " + counter);
                    }
                }
                counter++;
            }
        }

    });
    updatingThread.start();
}

From source file:Main.java

public static String RandomString(int length) {
    String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    Random rnd = new Random();

    StringBuilder sb = new StringBuilder(length);
    for (int i = 0; i < length; i++) {
        sb.append(AB.charAt(rnd.nextInt(AB.length())));
    }//from  w  w w.java  2s. com
    return sb.toString();

}