praktikum-holons/src/holeg/utility/math/Random.java

package holeg.utility.math;


public class Random {


  private static java.util.Random random = new java.util.Random();

  /**
   * True or false
   *
   * @return the random boolean.
   */
  public static boolean nextBoolean() {
    return random.nextBoolean();
  }

  /**
   * Between 0.0(inclusive) and 1.0 (exclusive)
   *
   * @return the random double.
   */
  public static double nextDouble() {
    return random.nextDouble();
  }

  public static float nextFloatInRange(float min, float max) {
    return min + random.nextFloat() * Math.abs(max - min);
  }

  /**
   * Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean and
   * standard deviation from this random number generator's sequence.
   *
   * @param mean
   * @param deviation
   * @return
   */
  public static double nextGaussian(double mean, double deviation) {
    return mean + random.nextGaussian() * deviation;
  }

  public static double nextDoubleInRange(double min, double max) {
    return min + random.nextDouble() * Math.abs(max - min);
  }

  /**
   * Random Int in Range [min;max[ with UniformDistirbution
   *
   * @param min
   * @param max
   * @return
   */
  public static int nextIntegerInRange(int min, int max) {
    return min + random.nextInt(max - min);
  }

  /**
   * Random Int in Range [min;max[ with UniformDistirbution
   *
   * @param min
   * @param max
   * @param valueBetween a value between min and max
   * @return
   */
  public static int nextIntegerInRangeExcept(int min, int max, int valueBetween) {
    int result = min;
    if (max - min == 1) {
      //return the other value
      return (valueBetween == min) ? max : min;
    }
    try {
      result = min + random.nextInt((max - 1) - min);
      if (result >= valueBetween) {
        result++;
      }
    } catch (java.lang.IllegalArgumentException e) {
      System.err.println("min : " + min + " max : " + max + " valueBetween:" + valueBetween);
      System.err.println("Except max should be more then min");
    }
    return result;
  }
}