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 getRandom(char[] sourceChar, int length) {
    if (sourceChar == null || sourceChar.length == 0 || length < 0) {
        return null;
    }/*from w  w w.j  a v a  2  s. c o  m*/

    StringBuilder str = new StringBuilder(length);
    Random random = new Random();
    for (int i = 0; i < length; i++) {
        str.append(sourceChar[random.nextInt(sourceChar.length)]);
    }
    return str.toString();
}

From source file:outfox.dict.contest.test.InitSingerData.java

public static String getRandomSchool() {
    String[] arr = { "?", "", "", "", "?",
            "?", "" };
    Random rand = new Random();
    int index = rand.nextInt(arr.length);
    return arr[index];
}

From source file:Main.java

public static String getRandom(int len, String[] arr) {
    String s = "";
    if (0 < len && null != arr && arr.length >= 0) {
        Random ra = new Random();
        int arrLen = arr.length;
        for (int i = 0; i < len; i++) {
            s += arr[ra.nextInt(arrLen)];
        }/* ww w.  j  a  v a 2s . c  o  m*/
        return s;
    } else {
        return s;
    }
}

From source file:Main.java

private static String randomSSID(int n) {
    String chars = "abcdeifABCDEIF0123456789";
    String res = "";
    Random rnd = new Random();
    int leng = chars.length();
    for (int i = 0; i < n; i++) {
        res = res + chars.charAt(rnd.nextInt(leng));

    }// w w w  .  j a v a2  s  .  c  o  m
    return res;
}

From source file:Main.java

private static String randomABC(int n) {
    String chars = "abcde0123456789";
    String res = "";
    Random rnd = new Random();
    int leng = chars.length();
    for (int i = 0; i < n; i++) {
        res = res + chars.charAt(rnd.nextInt(leng));

    }/*from ww  w  . j  ava  2s.  c o  m*/
    return res;
}

From source file:Main.java

/**
 * Shuffle an array.//from  w w  w  .ja  va2 s .  co  m
 * @param array Array.
 */
private static void Shuffle(double[] array) {
    Random random = new Random();
    for (int i = array.length - 1; i > 0; i--) {
        int index = random.nextInt(i + 1);
        double temp = array[index];
        array[index] = array[i];
        array[i] = temp;
    }
}

From source file:Main.java

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

From source file:Main.java

/**
 * Shuffle an array.//from w  ww. ja v a 2s .c o m
 * @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 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 a v  a2 s . co m
    }
    return sb.toString();
}

From source file:Main.java

private static byte[] getIV() {
    String base = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < 16; i++) {
        int number = random.nextInt(base.length());
        sb.append(base.charAt(number));/*  w  w  w .j av  a  2 s  .  c  o  m*/
    }
    return sb.toString().getBytes();
}