/** Polynomial.java defines a degree 1 polynomial class. *  Author:  Joel C. Adams *  Version: For Java: An Introduction to Computing 1/e.  All Rights Reserved. */package ann.math.polynomial;public interface Polynomial{ /** Convert String to Polynomial  *  Receive: String polyString.  *  Return:  the Polynomial equivalent to polyString.  */ public static Polynomial parsePolynomial(String polyString);  /** String converter (output)  *  Return: the String equivalent to me.  */ public String toString();}