Need help with this assigment, arraylist needs to be used, not arrays or lists, etc

The Term Class

Create a class to represent a term in an algebraic expression. As defined here, a term consists of the variable x, an integer coefficient, and a nonnegative integer exponent. E.g.

in the term 4x², the coefficient is 4 and the exponent 2

in -6x⁸, the coefficient is -6 and the exponent 8

Your class will have a constructor that creates a Term object with a coefficient and exponent passed as parameters, and accessor methods that return the coefficient and the exponent, respectively. Your class will also override toString to return a Term in this general form:

ax^b where a is the coefficient and b the exponent

with these special cases:

Case	Returns
a = 1	x^b
b = 1	ax
b = 0	a
a = 1, b = 1	x

You may assume that the coefficient will not be zero.

The Polynomial Class

A skeleton of the Polynomial class you are to use is on the class web site. All you have to do is write the bodies of the methods.

To get credit for this assignment, your Polynomial class must use an ArrayList-of-Term as its principal data structure

To get credit, you must not declare any additional instance variables or methods and must not modify any of the method declarations in any way (not necessary).

As defined here, a polynomial is a sequence of terms. E.g.

1.

2.

3.

The terms of polynomial 1 are (3,2), (4,4) and (1,6). The terms of polynomial 2 are (2,0), (5,2), (6,3) and (2,7). Polynomial 3 has only one term (4,10)

Note that the Polynomial class has:

A constructor that creates an empty Polynomial (a Polynomial with 0 terms)

A method with signature

public void addTerm(int coefficient, int exponent)

which creates a Term and places it in its proper position in the Polynomial

The terms of the Polynomial are stored in ascending order by exponent (see above) so you never have to sort the list. Terms with the same exponent may be stored in any order but will appear after all terms with lesser exponents and before all terms with greater exponents

A method with signature

public Polynomial polyAdd(Polynomial p)

which adds Polynomial p to this Polynomial and returns the sum

A method with signature

public Polynomial polyMultiply(Polynomial p)

which multiplies this Polynomial by p and returns the product

An overridden toString method that returns a String representation of a polynomial as a sum of terms. For example polynomial 1 above would have this String representation:

3x^2 + 4x^4 + x^6

A private method with signature

private void collectTerms()

which collects like terms of this Polynomial. E.g.

Before: x^2 + 3x^2 + 2x^2 + 3x^3 + 5x^4 + 2x^4

After: 6x^2 + 3x^3 + 7x^4

Polynomials must always be printed with terms collected

The Test Class

Test class PolynomialTester.java is available online. Make no changes to the test class.

Javadoc Comments

Make sure you properly document the Polynomial and Term classes and all public methods, including all parameters, and all return statements. Then run the javadoc utility to generate the help pages (Polynomial.html and Term.html).

import java.util.ArrayList; public class Polynomial { // do NOT modify this instance variable declaration private ArrayList polynomial ; public Polynomial() // constructor { // TO DO: write body of this constructor } public void addTerm(int coeff, int expo) { // TO DO: write body of this method } public String toString() { // TO DO: write body of this method // temporary return so class skeleton will compile and run return "Hi Mom!" ; } // collect terms of a Polynomial object. I.e. replace all terms having the // same exponent with a single term which is their sum private void collectTerms() { // TO DO: write body of this method } public Polynomial polyMultiply(Polynomial p) { // TO DO: write body of this method // temporary return so class skeleton will compile and run return null ; } public Polynomial polyAdd(Polynomial p) { // TO DO: write body of this method // temporary return so class skeleton will compile and run return null ; } } // end of Polynomial class definition ========================= 

public class PolynomialTester { public static void main(String[] args) { Polynomial p1 = new Polynomial(); Polynomial p2 = new Polynomial(); Polynomial p0 = new Polynomial(); Polynomial nullTest = p1.polyAdd(p2); System.out.println(" p1 = " + p1 + " p2 = " + p2 + " p1 + p2 = " + nullTest); nullTest = p1.polyMultiply(p2); System.out.println(" p1 = " + p1 + " p2 = " + p2 + " p1 * p2 is " + nullTest); p1.addTerm(5, 2); p1.addTerm(4, 5); p1.addTerm(3, 3); p1.addTerm(1, 2); p1.addTerm(5, 6); p2.addTerm(3, 8); p2.addTerm(2, 5); p2.addTerm(1, 2); p0.addTerm(1, 2); p0.addTerm(5, 0); p0.addTerm(4, 1); System.out.println(" p0 = " + p0); Polynomial p3 = p1.polyAdd(p2); System.out.println(" p1 = " + p1 + " p2 = " + p2 + " p1+p2 = " + p3); Polynomial p4 = p1.polyMultiply(p2); System.out.println(" p1 = " + p1 + " p2 = " + p2 + " p1*p2 = " + p4); Polynomial p5 = p2.polyMultiply(p2); System.out.println(" p2 = " + p2 + " p2*p2 = " + p5); Polynomial p6 = p0.polyMultiply(p2); System.out.println(" p0 = " + p0 + " " + "p2 = " + p2 + " p0*p2 = " + p6); Polynomial p7 = p0.polyAdd(p2); System.out.println(" p0 = " + p0 + " " + "p2 = " + p2 + " p0+p2 = " + p7); p1 = p1.polyAdd(p2); System.out.println(" After p1 = p1+p2 p1 = " + p1); p2 = p2.polyMultiply(p2); System.out.println(" After p2 = p2*p2 p2 = " + p2); } }