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));
	}
}