@Override
	public Integer max() {
		return _max;
	}
Create a new random {@code IntegerGene} with the given value and the
given range. If the {@code value} isn't within the interval
{@code [min, max)}, no exception is thrown. In this case the method
{@link IntegerGene#isValid()} returns {@code false}.

@param allele the value of the gene.
@param min the minimal valid value of this gene (inclusively).
@param max the maximal valid value of this gene (exclusively).
jenetics/src/main/java/io/jenetics/IntegerGene.java