PolynomialTester.java

import java.util.TreeMap;

/**
   A class to to test the Polynomial class.
*/
public class PolynomialTester
{
   public static void main(String[] args)
   {
      System.out.println("Creating P1(x) with the terms (0,-9), (2,-2), (6,8), and (4,6) ...");
      Polynomial p1 = new Polynomial( new TreeMap<Integer,Integer>() {{ put(0,-9); put(2,-2); put(6,8); put(4,6); }} );
      System.out.println("P1(x) = " + p1);
      System.out.println("Degree of P1(x) = " + p1.getDegree());
      System.out.println("Coefficient of x^2 in P1(x) = " + p1.coefficient(2));
      p1.changeCoefficient(6, 3);
      p1.removeTerm(4);
      System.out.println("P1(x) after changing coefficient of term 6 and removing term 4");
      System.out.println("P1(x) = " + p1);

      System.out.println("Creating P2(x) with the terms (-2,5), (0,4), (2,1), and (1,3) ...");
      Polynomial p2 = new Polynomial( new TreeMap<Integer,Integer>() {{ put(-2,5); put(0,4); put(2,1); put(1,3); }} );
      System.out.println("P2(x) = " + p2);

      System.out.println("Create a copy of P2(x) ...");
      Polynomial p2c = new Polynomial(p2);
      System.out.println("Copy of P2(x) = " + p2c);

      System.out.println("Adding P2(x) to P1(x)...");
      p1.add(p2);
      System.out.println("P1(x) = P1(x) + P2(x) = " + p1);

      System.out.println("Subtracting P1(x) from P2(x) and store in P2(x)...");
      p2.subtract(p1);
      System.out.println("P2(x) = P2(x) - P1(x) = " + p2);

      System.out.println("Multiplying P1(x) by P2(x) and store it into Q(x) ...");
      Polynomial q = p1.multiply(p2);
      System.out.println("Q(x) = P1(x) * P2(x) = " + q);

      System.out.println("P2(5) = " + p2.evaluate(5));

      System.out.println("P1(x) = " + p1);
      System.out.println("P2(x) = " + p2);
      System.out.println("P1(x) " + (p1.equals(p2)?"is equal to P2(x)":"is not equal to P2(x)"));

      System.out.println("Add P1(x) and P2(x) and store it into P3(x) ...");
      Polynomial p3 = Polynomial.add(p1, p2);
      System.out.println("P3(x) = " + p3);

      System.out.println("Subtracting P1(x) from P2(x) and store it into P4(x) ...");
      Polynomial p4 = Polynomial.subtract(p2, p1);
      System.out.println("P4(x) = " + p4);
     
      if (p3.compareTo(p4)>0)
         System.out.println("P3(x) is greater than P4(x)");
      if (p3.compareTo(p4)<0)
         System.out.println("P3(x) is less than P4(x)");

      Quadratic quad = new Quadratic(2, 5, -3);
      System.out.println("Q(x) = " + quad);
      if (quad.roots())
         System.out.printf("Roots of quadratic Q(x)=5x^2+10x+3: Root1=%10.3f , Root2=%10.3f\n",quad.getRoot1(),quad.getRoot2());
      else
         System.out.println("This quadratic polynomial has no real roots. (Delta < 0)");

      quad = new Quadratic(10, 5, 3);
      System.out.println("Q(x) = " + quad);
      if (quad.roots())
         System.out.printf("Roots of quadratic Q(x)=5x^2+10x+3: Root1=%10.3f , Root2=%10.3f\n",quad.getRoot1(),quad.getRoot2());
      else
         System.out.println("This quadratic polynomial has no real roots. (Delta < 0)");
   }
}