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

public static String getRandomFileName() {
    String _df = android.text.format.DateFormat.format("MMddyyyyhhmmss", new java.util.Date()).toString();
    Random r = new Random();
    int random = Math.abs(r.nextInt() % 100);
    return String.format("%d%s.jpg", random, _df);
}

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. ja va  2  s . co m
        return s;
    } else {
        return s;
    }
}

From source file:Main.java

public static int[] getRandomArray(int length, int max) {
    int[] randArray = new int[length];
    Random rand = new Random();
    for (int i = 0; i < length; i++) {
        randArray[i] = rand.nextInt(max);
    }/*from  ww w  .j  a  v  a 2s. c o m*/
    Arrays.sort(randArray);
    for (int i = 1; i < length; i++) {
        if (randArray[i] == randArray[i - 1]) {
            randArray[i] += 1;
        }
    }
    for (int i = length - 1; i > 0; i--) {
        if (randArray[i] == randArray[i - 1]) {
            randArray[i - 1] -= 1;
        }
    }
    return randArray;

}

From source file:Main.java

public static int genRand(int min, int max) {
    return (new Random()).nextInt(max) % (max - min + 1) + min;
}

From source file:Main.java

private static String generateRandomCharacter() {
    final String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    final int length = alphabet.length();
    Random random = new Random();
    String randomChar = String.valueOf(alphabet.charAt(random.nextInt(length)));
    return randomChar;
}

From source file:Main.java

public static List<String> generateWidth() {
    List<String> ids = new ArrayList<String>();
    Random mRandom = new Random();
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 50; i++) {
        sb.delete(0, sb.length());/*w w w.j  a va  2 s.co m*/
        int height = mRandom.nextInt(250) + 100;
        sb.append(height);
        ids.add(sb.toString());
    }
    return ids;
}

From source file:Main.java

/**
 * Initialize the random number generator
 */
public static void randInit() {
    _rand = new Random();
}

From source file:Main.java

public static int[] randNum(int num, int min, int max) {
    ArrayList<Integer> list = new ArrayList<Integer>();
    Random rand = new Random();
    while (true) {
        int rm = (rand.nextInt(max - min) + min);
        if (!list.contains(rm)) {
            list.add(rm);//from  w w w . j ava 2 s  .  c  o m
            if (list.size() >= num)
                break;
        }
    }
    int result[] = new int[num];
    for (int i = 0; i < list.size(); i++) {
        result[i] = list.get(i);
    }
    return result;
}

From source file:Main.java

/**
 * Create a random string hex color.//from  w w w  .j ava2  s  .  c  om
 * @return string hex color
 */
public static String randomHex() {
    Random rnd = new Random();
    return String.format("#%02X%02X%02X", rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
}

From source file:Main.java

public static String generateRandomString(final int len) {
    final String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    final Random random = new Random();
    final StringBuffer sb = new StringBuffer();
    for (int i = 0; i < len; i++) {
        final int number = random.nextInt(base.length());
        sb.append(base.charAt(number));//from ww  w.  ja  v a  2 s .c  o  m
    }
    return sb.toString();
}