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 int[] sortearCores() {

    Random r = new Random();

    return new int[] { coresSecretas[r.nextInt(7)], coresSecretas[r.nextInt(7)], coresSecretas[r.nextInt(7)] };
}

From source file:Main.java

public static int getRandomNumber() {
    return new Random().nextInt(100) + 1;
}

From source file:Main.java

public static int randomColor() {
    // http://developer.android.com/reference/android/graphics/Color.html#HSVToColor%28float%5B%5D%29
    float hue = new Random().nextInt(360); // 0 - 360
    float saturation = randomInRange(0.5f, 0.8f); // 0.5 to 0.8, away from white. but not too intense
    float brightness = randomInRange(0.5f, 0.8f); // 0.5 to 0.8, away from black, but not too light

    return Color.HSVToColor(new float[] { hue, saturation, brightness });
}

From source file:Main.java

/**
 * Shuffle an array./*  w w  w  . j a  v  a2  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

/**
 * Generate array of alphabet//from www  . j av a 2  s .  co m
 * @return String
 */
public static String generateAlphabet(int length) {

    String alphabet = "abcdefghijklmnopqrstuvwxyz";
    String randomAlphabet = "";
    Random random = new Random();
    for (int i = 0; i < length; i++) {

        randomAlphabet = randomAlphabet + alphabet.charAt(random.nextInt(alphabet.length()));

    }

    return randomAlphabet;
}

From source file:Main.java

/**
 * Generate array of Number//from   w  ww  . j a  v  a 2 s  .  c  o m
 * @param length int
 * @return String
 */
public static String generateNumber(int length) {

    String numbers = "0123456789";
    String randomNumber = "";
    Random random = new Random();
    for (int i = 0; i < length; i++) {

        randomNumber = randomNumber + numbers.charAt(random.nextInt(numbers.length()));

    }

    return randomNumber;
}

From source file:Main.java

public static Integer[] randomIntArray(int size) {

    Integer a[] = new Integer[size];
    HashSet<Integer> set = new HashSet<>();
    for (int x = 0; x < a.length; x++) {

        Random r = new Random();
        Integer i = r.nextInt(size * 10);

        while (set.contains(i)) {
            i = r.nextInt(size);//from   w ww  .  j av  a2 s  .  c o m
        }
        set.add(i);
        a[x] = i;
    }
    return a;
}

From source file:Main.java

public static char randomChar(String alphabet) {
    return alphabet.charAt(new Random().nextInt(alphabet.length()));
}

From source file:Main.java

public static <T> List<T> getRandomCollection(Class<T> collectionType) {
    int collectionSize = new Random().nextInt(10);
    List<T> collection = new ArrayList<T>();
    for (int i = 0; i < collectionSize; i++) {
        Object obj = getRandomValue(collectionType);
        if (obj != null && obj.getClass().isAssignableFrom(collectionType)) {
            collection.add((T) obj);/*from  ww  w  .  j  a va 2s .  com*/
        }
    }
    return collection;
}

From source file:Main.java

/**
 * Get a random number between a min and max
 * @param min lower end min/*  w ww .ja  va 2 s .c o m*/
 * @param max higher end max
 * @return
 */
public static int getRandomInt(int min, int max) {
    Random rand = new Random();
    int randomNum = rand.nextInt((max - min) + 1) + min;
    return randomNum;
}