@Override
	public int dominance(final Vec<Point2> point) {
		requireNonNull(point);
		final Point2 other = point.data();

		boolean adom = false;
		boolean bdom = false;

		int cmp = Double.compare(_x, other._x);
		if (cmp > 0) {
			adom = true;
		} else if (cmp < 0) {
			bdom = true;
		}

		cmp = Double.compare(_y, other._y);
		if (cmp > 0) {
			adom = true;
			if (bdom) {
				return 0;
			}
		} else if (cmp < 0) {
			bdom = true;
			if (adom) {
				return 0;
			}
		}

		if (adom == bdom) {
			return 0;
		} else if (adom) {
			return 1;
		} else {
			return -1;
		}
	}
Return the <em>y</em> value of the point.

@return the <em>y</em> value of the point
jenetics.ext/src/test/java/io/jenetics/ext/moea/Point2.java