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

/**
 * Returns a pseudo-random number between min and max, inclusive.
 * The difference between min and max can be at most
 * <code>Integer.MAX_VALUE - 1</code>.
 *
 * @param min Minimum value/*from www .  ja  va2 s  . c  o m*/
 * @param max Maximum value.  Must be greater than min.
 * @return Integer between min and max, inclusive.
 * @see java.util.Random#nextInt(int)
 */
public static int randInt(int min, int max) {

    // Usually this can be a field rather than a method variable
    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:Main.java

protected static String generateRandomString(int demoLength) {
    String base = "abcdefghijklmnopqrstuvwxyz";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < demoLength; i++) {
        int number = random.nextInt(base.length());
        sb.append(base.charAt(number));/*ww w  .j  a  va  2s  .  c o m*/
    }
    return sb.toString();
}

From source file:Coin.java

public String toss() {
    Random myRand = new Random();
    int face = myRand.nextInt(2);
    if (face == 0) {
        return "heads";
    } else {//from  www  . jav  a  2 s .  c o  m
        return "tails";
    }
}

From source file:Test.java

private static void startUpdateThread(int i, final ConcurrentMap<Integer, String> concurrentMap) {
    Thread thread = new Thread(new Runnable() {
        public void run() {
            while (!Thread.interrupted()) {
                Random random = new Random();
                int randomInt = random.nextInt(20);
                concurrentMap.put(randomInt, UUID.randomUUID().toString());
            }//from w  w  w. ja  v  a  2  s . c om
        }
    });
    thread.setName("Update Thread " + i);
    updateThreads.add(thread);
    thread.start();
}

From source file:Main.java

public static String getRandomFileName(String filePath) {
    SimpleDateFormat format = new SimpleDateFormat("MMddHHmmss", Locale.getDefault());
    Date date = new Date();
    String key = format.format(date);

    Random r = new Random();
    key = key + r.nextInt();//  w w w  .  j  av a 2s.c  om
    key = key.substring(0, 15);
    return filePath + "/" + key + ".jpeg";
}

From source file:Main.java

/**
 * Shuffle an array./*from w  w w.  j  a  va  2  s  . c om*/
 * @param array Array.
 */
private static void Shuffle(float[] array) {
    Random random = new Random();
    for (int i = array.length - 1; i > 0; i--) {
        int index = random.nextInt(i + 1);
        float temp = array[index];
        array[index] = array[i];
        array[i] = temp;
    }
}

From source file:Main.java

public static boolean[] generateRandomBooleanArray(int size) {
    boolean[] res = new boolean[size];
    Random r = new Random();
    for (int i = 0; i < size; i++)
        res[i] = r.nextBoolean();//  w w w . j  a  va2 s. c om
    return res;
}

From source file:com.dhenton9000.selenium.generic.UtilMethods.java

public static String generateRandomName(String rootName) {
    Random r = new Random();
    String randomStr = Long.toString(Math.abs(r.nextLong()), 21);
    String randomName = rootName + "_" + randomStr.substring(0, 4);
    return randomName;
}

From source file:Main.java

public static final String randomString(int length) {
    Random randGen = null;/* w  w w  .j ava  2 s. co  m*/
    char[] numbersAndLetters = null;
    Object initLock = new Object();
    if (length < 1) {
        return null;
    }
    if (randGen == null) {
        synchronized (initLock) {
            if (randGen == null) {
                randGen = new Random();
                numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz"
                        + "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
            }
        }
    }
    char[] randBuffer = new char[length];
    for (int i = 0; i < randBuffer.length; i++) {
        randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
    }
    return new String(randBuffer);
}

From source file:Main.java

protected static byte[] getBogusNodeID() {
    byte[] id = new byte[20];

    new Random().nextBytes(id);

    return (id);//from  www .j a v a 2  s  . c o m
}