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

/**
 * get random number from your boundary//from   ww  w.j ava 2  s  .c  o m
 *
 * @param number max number till you want get random.
 * @return random number
 */
public static int getRandom(int number) {
    Random rand = new Random();
    return rand.nextInt(number);
}

From source file:Main.java

private static void BindPort() {
    Random random = new Random();
    port = random.nextInt(65535);//w w  w .  ja  v  a 2  s.  c  om

    try {
        datagramSocket = new DatagramSocket(port);
    } catch (SocketException e) {
        // TODO Auto-generated catch block
        BindPort();
    }
}

From source file:Main.java

public static void sleep() {
    sleep(new Random().nextInt(2000));
}

From source file:Main.java

static void shuffleArray(int[] ar) {
    Random rnd = new Random();
    for (int i = ar.length - 1; i > 0; i--) {
        int index = rnd.nextInt(i + 1);
        // Simple swap
        int a = ar[index];
        ar[index] = ar[i];/*from w ww  . j a v a2s .  co  m*/
        ar[i] = a;
    }
}

From source file:Main.java

public static String generateToken() {
    char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
    StringBuilder sb = new StringBuilder();
    Random random = new Random();

    for (int i = 0; i < 40; i++) {
        char c = chars[random.nextInt(chars.length)];
        sb.append(c);//from   w  w  w .j  a  va2 s. c om
    }

    return sb.toString();
}

From source file:Main.java

/**
 * Select a random number within a specified range.
 * @param min Lower limit.//from   www.j  a  v  a 2 s .co  m
 * @param max Upper limit.
 * @return int
 */
public static int getRandomInteger(int min, int max) {
    Random r = new Random();
    return r.nextInt((max - min) + 1) + min;
}

From source file:Main.java

public static String[] randomizeArray(String[] array) {

    Arrays.sort(array, new Comparator<String>() {

        private final Random generator = new Random();

        @Override// w  w w  .j av a 2  s  . c  o m
        public int compare(String lhs, String rhs) {
            // returns a random int between 1 and -1
            return (generator.nextInt(1) * 2) - 1;
        }
    });
    return array;
}

From source file:Main.java

/**
 * get random color rgb value/* w w w  . ja v a 2  s. c o  m*/
 * @return rgb color int
 */
public static int getRandomColor() {
    Random random = new Random();
    /*
     * Better limiting value.
     * if value is too small, it will appear lighter
     * if value is too large, it will appear darker
     */
    //limit within 50-199
    int red = random.nextInt(150) + 50;
    int green = random.nextInt(150) + 50;
    int blue = random.nextInt(150) + 50;
    //create a color int as per rgb and return
    return Color.rgb(red, green, blue);
}

From source file:Main.java

public static void initialize_weight(float[] weight, int size, boolean randomFlag) {
    // if randomFlag == true, generate weight randomly
    // otherwise, initialize all weight to 0.0
    Random randomGenerator = new Random();
    for (int i = 0; i < size; i++) {
        if (randomFlag == true) {
            weight[i] = randomGenerator.nextFloat();
        } else {/*from  w w w  .  j  a v a2 s. c o m*/
            weight[i] = (float) 0.0;
        }
    }
}

From source file:Main.java

public static int[] getMachineSelectionNumNo(int size, int numbers[]) {
    int length = numbers.length;
    int num[] = new int[size];
    Random random = new Random();
    List<Integer> list = new ArrayList<Integer>();
    while (list.size() < size) {
        int number = numbers[random.nextInt(length)];
        list.add(number);//from  ww  w  .ja v  a  2s.  c  o  m
    }

    for (int i = 0; i < list.size(); i++) {
        num[i] = list.get(i);
    }
    return num;
}