Define the equals method for QuadraticExp class, which overrides the method inhe

Question

Define the equals method for QuadraticExp class, which overrides the method inherited from Object

public class QuadraticExp

{

      private double a;

      private double b;

     private double c;

// equals method

}

2.For Polynomial class

public class Polynomial

         private int degree;

    private double[] coeff;

    // coeff[i] stores the coefficient for term x^i, for 0 <= i <= degree

// (1) Define a copy constructor for

public Polynomial( Polynomial p)

(2) add which return a polynomial that is the sum of p and this polynomial

// make sure the degree is set properly, which can be smaller than both

// the degree of this polynomial and the degree of p

public Polynomial add(Polynomial p)

// (3) write a simple main method to test your code

       // assuming the following methods are already defined

        public Polynomial()// Creates a polynomial represents 0

    { …}

   public Polynomial(double a0)

   // Creates a polynomial has a single x^0 term with coefficient a0

   { …}

public void add_to_coef(double amount, int exponent)

//Adds the given amount to the coefficient of the specified exponent.

public void assign_coef(double coefficient, int exponent)

// Sets the coefficient for the specified exponent.

Explanation / Answer

class QuadraticExp

{

      private double a;

      private double b;

     private double c;

    // equals method

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final QuadraticExp other = (QuadraticExp) obj;
        if (Double.doubleToLongBits(this.a) != Double.doubleToLongBits(other.a)) {
            return false;
        }
        if (Double.doubleToLongBits(this.b) != Double.doubleToLongBits(other.b)) {
            return false;
        }
        if (Double.doubleToLongBits(this.c) != Double.doubleToLongBits(other.c)) {
            return false;
        }
        return true;
    }

}

class Polynomial {

         private int degree;

    private double[] coeff;

    // coeff[i] stores the coefficient for term x^i, for 0 <= i <= degree

// (1) Define a copy constructor for

public Polynomial( Polynomial p) {
      degree = p.degree;
      Arrays.copyOf(coeff, degree + 1);
}

public Polynomial add(Polynomial p) {
      Polynomial result = new Polynomial(0);
     result.degree = max(p.degree, degree);
      result.coeff = new double[result.degree + 1];
    
      for (int i = 0; i < result.degree; i++) {
          result.coeff[i] = 0;
          if (i < this.degree)
              result.coeff[i] += this.coeff[i];
        
          if ( i < p.degree)
              result.coeff[i] += p.coeff[i];
      }
      while (result.degree > 0) {
          if (result.coeff[result.degree] == 0)
              result.degree--;
          else
              break;
      }
      return result;
}
public void add_to_coef(double amount, int exponent) {
      coeff[exponent] += amount;
}

public void assign_coef(double amount, int exponent) {
      coeff[exponent] = amount;
}

public Polynomial(double a0) {
      degree = 1;
      coeff = new double[1];
      coeff[0] = a0;
}


}

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