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 void shuffle_array(int[] array) {
    int index, temp;
    Random random = new Random();
    for (int i = array.length - 1; i > 0; i--) {
        index = random.nextInt(i + 1);
        temp = array[index];//w w  w  . ja va 2  s  . c o m
        array[index] = array[i];
        array[i] = temp;
    }
}

From source file:Main.java

public static int[] 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 www  . ja v a2 s  .  c  om
        ar[i] = a;
    }

    return ar;
}

From source file:Main.java

public static String randomString(int stringLength) {
    char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    StringBuilder randomStringBuilder = new StringBuilder();
    Random random = new Random();
    for (int i = 0; i < stringLength; i++) {
        char c = chars[random.nextInt(chars.length)];
        randomStringBuilder.append(c);/*from w  w  w .j av  a  2 s  .co  m*/
    }
    return randomStringBuilder.toString();
}

From source file:Main.java

public static String getNumberRadim(int n) {
    if (n < 1 || n > 10) {
        throw new IllegalArgumentException("cannot random " + n + " bit number");
    }//w w w. j  ava 2s .  c om
    Random ran = new Random();
    if (n == 1) {
        return String.valueOf(ran.nextInt(10));
    }
    int bitField = 0;
    char[] chs = new char[n];
    for (int i = 0; i < n; i++) {
        while (true) {
            int k = ran.nextInt(10);
            if ((bitField & (1 << k)) == 0) {
                bitField |= 1 << k;
                chs[i] = (char) (k + '0');
                break;
            }
        }
    }
    return new String(chs);
}

From source file:com.snowplowanalytics.snowplow.tracker.core.Util.java

public static int getTransactionId() {
    Random r = new Random(); //NEED ID RANGE
    return r.nextInt(999999 - 100000 + 1) + 100000;
}

From source file:Main.java

public static ArrayList<Integer> shuffleArray(int size) {
    ArrayList<Integer> shuffled = new ArrayList<>();
    for (int i = 0; i < size; i++) {
        shuffled.add(i);/*from   w w w .  j  av a2  s . c  om*/
    }

    Random rnd = new Random();
    for (int i = size - 1; i > 0; i--) {
        int index = rnd.nextInt(i + 1);
        // Simple swap
        int a = shuffled.get(index);
        shuffled.set(index, shuffled.get(i));
        shuffled.set(i, a);
    }

    return shuffled;
}

From source file:com.cloudbase.CBBoundary.java

private static String generateBoundary() {
    // Boundary delimiters must not appear within the encapsulated material, 
    // and must be no longer than 70 characters, not counting the two
    // leading hyphens.
    Random rand = new Random();
    final int count = rand.nextInt(11) + 30; // a random size from 30 to 40
    StringBuilder buffer = new StringBuilder(count);
    for (int i = 0; i < count; i++) {
        buffer.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);
    }//www  .  ja  va2s  .  c om
    return buffer.toString();
}

From source file:Main.java

public static String generateRandomStrs(int strCount) {
    StringBuilder randomStrs = new StringBuilder();
    Random randomGenerator = new Random();
    for (int i = 1; i < strCount; i++) {
        int randomInt = randomGenerator.nextInt(26);
        randomStrs.append((char) (randomInt + 'a'));
    }// w  w  w  .j  a  v  a  2s  . c  o  m

    return randomStrs.toString();
}

From source file:Main.java

public static int getRandomNumber(int start, int end) {
    end++;/* w  w  w  .j a  v  a2s.  c  om*/
    Random random = new Random();
    int result = -1;

    if (start == 0) {
        result = random.nextInt(end);
    } else {
        result = random.nextInt(end);
        if (result < start) {
            result = result + start;
        }
    }
    return result;
}

From source file:Main.java

static String generateHoodieId() {
    int hoodieIDLength = 7;
    String alphabet = "0123456789abcdefghijklmnopqrstuvwxyz";
    int alphabetLength = alphabet.length();

    String result = "";

    Random rnd = new Random();

    for (int i = 0; i < hoodieIDLength; i++) {
        int r = rnd.nextInt(alphabetLength);
        char c = alphabet.charAt(r);

        result += c;//  www .j  a  va 2 s.c om
    }

    return result;
}