public abstract class AbstractPolynom implements Polynom {
	//Data
	protected int degree;

  	//Abstract methods
  	public abstract double coeff(int degree);
  	public abstract double setCoeff(int degree,double value);
  	protected abstract Polynom create();
  	public abstract java.util.Iterator<Integer> degrees();
  	  	
  	//Polynom methods
	public int degree() { return this.degree; }
	     	
	public Polynom add(Polynom arg) {
		Polynom result = create();
  		java.util.Iterator<Integer> it = this.degrees();
		while(it.hasNext()) {
			int degree = it.next();
			result.setCoeff(degree,this.coeff(degree));
		}
		it = arg.degrees();
		while(it.hasNext()) {
			int degree = it.next();
			result.setCoeff(degree,result.coeff(degree) + arg.coeff(degree));
		}
		return result;
  	}
  	
  	public Polynom mult(Polynom arg) {
  		System.out.println("Not implemented!");
  		return null;
  	}
  	
	public double eval(double value) {
		System.out.println("Not implemented!");
  		return 0;
  	}
  	
  	public Polynom derive() {
  		System.out.println("Not implemented!");
  		return null;
  	}

	public double[] toArray() {
		java.util.Iterator<Integer> it = this.degrees();
		double[] result = new double[this.degree() + 1];
		while(it.hasNext()) {
			int degree = it.next();
			result[degree] = this.coeff(degree);
		}
		return result;
	}
  	 	
  	//Override methods - inherited from class Object
  	public boolean equals(Object arg) {
  		Polynom P = this;
  		Polynom Q = (Polynom)arg;
   		if(P.degree() != Q.degree()) return false;
   		double[] PArray = P.toArray();
		double[] QArray = Q.toArray();
		//Proverka dali masivite PArray i QArray savpadat
		//...
  	}
  	
  	public String toString() {
		String result = "Polynom degree: " + this.degree + '\n';
		java.util.Iterator<Integer> it = this.degrees();
		while(it.hasNext()) {
			int degree = it.next();
			double coeff = this.coeff(degree);
			result = result + "Coefficient: " + coeff + " Degree: " + degree +'\n';
		}
		return result;
  	}
}