package random;
import java.util.Random;

public class Util {
  private Util() {}
  static private Random RANDOM = new Random();

  /** doubles that differ by less than EPSILON should be considered equals */
  static public final double EPSILON = 1e-9;
  static public boolean isEquals(double x, double y) {
    return Math.abs(x-y) <= EPSILON;
  }
  static public boolean isLessOrEquals(double x, double y) {
    return (x-y) <= EPSILON;
  }
  static public boolean isLess(double x, double y) {
    return (x-y) < -EPSILON;
  }

  static public void setRandomSeed(long seed) {
    RANDOM.setSeed(seed);
  }
  static public double nextRandom(double min, double max) {
    if (Util.isLess(max,min))
      throw new IllegalArgumentException(max + " is smaller than " + min);
    return min + ((RANDOM.nextDouble()) * (max - min));
  }
}