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 GetRandomColor() {
    Random random = new Random();
    int p = random.nextInt(Colors.length);
    while (Colors[p].equals(lastColor0) || Colors[p].equals(lastColor1) || Colors[p].equals(lastColor2)) {
        p = random.nextInt(Colors.length);
    }//from www .  j  a  va2s  .c o m
    lastColor0 = lastColor1;
    lastColor1 = lastColor2;
    lastColor2 = Colors[p];
    return Color.parseColor(Colors[p]);
}

From source file:Main.java

private static Bundle createNamePortBundle(String name, int port, TreeMap<String, ArrayList<String>> ips) {
    Bundle namePort = new Bundle();
    namePort.putString("name", name);
    namePort.putInt("port", port);
    if (ips != null) {
        ArrayList<String> ip = ips.get(name);
        Collections.shuffle(ip, new Random());
        namePort.putString("ip", ip.get(0));
    }/*w w w  .  j av  a  2  s.c o m*/
    return namePort;
}

From source file:Main.java

/**
 * Get a random double number from min to max.
 *
 * @param min//from ww  w  .  java2  s.c  om
 *            the minimum value
 * @param max
 *            the maximum value
 * @return
 */
public static double getRandomValue(double min, double max) {
    Random r = new Random();
    return ((int) (10000 * ((r.nextDouble() * (max - min)) + min))) / 10000.0;
}

From source file:Main.java

public static int randInt(int min, int max) {

    // Usually this can be a field rather than a method variable
    Random rand = new Random();

    // nextInt is normally exclusive of the top value,
    // so add 1 to make it inclusive
    int randomNum = rand.nextInt((max - min) + 1) + min;

    return randomNum;
}

From source file:Main.java

private static String getRandomHost() {
    Random r = new Random();
    return BEECLOUD_HOSTS[r.nextInt(BEECLOUD_HOSTS.length)] + HOST_API_VERSION;
}

From source file:MainClass.java

private static String encrypt(char[] password, String plaintext) throws Exception {

    byte[] salt = new byte[8];
    Random random = new Random();
    random.nextBytes(salt);/*w  w w.  j a  v  a2s.co m*/

    PBEKeySpec keySpec = new PBEKeySpec(password);

    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");

    SecretKey key = keyFactory.generateSecret(keySpec);

    PBEParameterSpec paramSpec = new PBEParameterSpec(salt, 1000);

    Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
    cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);

    byte[] ciphertext = cipher.doFinal(plaintext.getBytes());

    BASE64Encoder encoder = new BASE64Encoder();

    String saltString = encoder.encode(salt);
    String ciphertextString = encoder.encode(ciphertext);

    return saltString + ciphertextString;
}

From source file:Main.java

public static Calendar getRandomApodDate() {
    Calendar newCalendar = Calendar.getInstance();

    Calendar today = Calendar.getInstance();
    int currentYear = today.get(Calendar.YEAR);
    int currentMonth = today.get(Calendar.MONTH);
    int currentDay = today.get(Calendar.DATE);

    int firstApodYear = 1995;
    int firstApodMonth = 5;
    int firstApodDay = 20;

    Random rnd = new Random();
    int newYear = rnd.nextInt(currentYear - firstApodYear + 1) + firstApodYear;

    int minMonth = 0;
    int maxMonth = 11;
    if (newYear == firstApodYear)
        minMonth = firstApodMonth;//from   w w  w. jav a  2  s .  com
    if (newYear == currentYear)
        maxMonth = currentMonth;
    int newMonth = rnd.nextInt(maxMonth - minMonth + 1) + minMonth;

    newCalendar.set(newYear, newMonth, 1);

    int minDay = 1;
    int maxDay = newCalendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    if (newYear == firstApodYear && newMonth == firstApodMonth)
        minDay = firstApodDay;
    if (newYear == currentYear && newMonth == currentMonth)
        maxDay = currentDay;
    int newDay = rnd.nextInt(maxDay - minDay + 1) + minDay;

    newCalendar.set(newYear, newMonth, newDay);
    return newCalendar;
}

From source file:Main.java

public static int getRandomColor() {
    List<Integer> colors = new ArrayList<>();
    colors.add(Color.BLACK);//from   ww  w  . j a va 2s . c  o  m
    colors.add(Color.RED);
    colors.add(Color.GREEN);
    colors.add(Color.BLUE);
    colors.add(Color.YELLOW);
    colors.add(Color.GRAY);
    colors.add(Color.MAGENTA);
    colors.add(Color.CYAN);
    colors.add(Color.LTGRAY);
    return colors.get(new Random().nextInt(colors.size()));
}

From source file:com.android.volley.utils.CacheTestUtils.java

/**
 * Makes a random cache entry./*from   ww w. j  av  a2s.c om*/
 * @param data Data to use, or null to use random data
 * @param isExpired Whether the TTLs should be set such that this entry is expired
 * @param needsRefresh Whether the TTLs should be set such that this entry needs refresh
 */
public static Cache.Entry makeRandomCacheEntry(byte[] data, boolean isExpired, boolean needsRefresh) {
    Random random = new Random();
    Cache.Entry entry = new Cache.Entry();
    if (data != null) {
        entry.data = data;
    } else {
        entry.data = new byte[random.nextInt(1024)];
    }
    entry.etag = String.valueOf(random.nextLong());
    entry.lastModified = random.nextLong();
    entry.ttl = isExpired ? 0 : Long.MAX_VALUE;
    entry.softTtl = needsRefresh ? 0 : Long.MAX_VALUE;
    return entry;
}

From source file:Main.java

/**
 * Samples without replacement from a collection.
 *
 * @param c//from  w w  w. jav a2s  .com
 *          The collection to be sampled from
 * @param n
 *          The number of samples to take
 * @return a new collection with the sample
 */
public static <E> Collection<E> sampleWithoutReplacement(Collection<E> c, int n) {
    return sampleWithoutReplacement(c, n, new Random());
}