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  1. public class Poly {
  2.    //OVERVIEW:
  3.     ...
  4.    private int[ ] trms;
  5.    private int deg;
  6.  
  7.    // constructors
  8.    public Poly ( ) {
  9.       //EFFECTS: Initializes this to be the zero polynomial.
  10.       trms = new int[1]; deg = 0;
  11.    }
  12.  
  13.    public Poly (int c, int n) throws NegativeExponentException {
  14.       //EFFECTS: If n < 0 throws NegativeExponentException else
  15.      //initializes this to be the Poly cxn.
  16.       if (n < 0)
  17.          throw new NegativeExponentException("Poly(int,int) constructor");
  18.       if (c == 0) { trms = new int[1]; deg = 0; return; }
  19.       trms = new int[n+1];
  20.       for (int i = 0; i < n; i++) trms[i] = 0;
  21.       trms[n] = c;
  22.       deg = n;
  23.    }
  24.  
  25.    private Poly (int n) { trms = new int[n+1]; deg = n; }
  26.  
  27.    // methods
  28.    public int degree ( ) {
  29.       //EFFECTS: Returns the degree of this, i.e., the largest exponent
  30.      //   with a non-zero coefficient. Returns 0 if this is the zero Poly.
  31.       return deg;
  32.    }
  33.  
  34.    public int coeff (int d) {
  35.       //EFFECTS: Returns the coefficient of the term of this whose exponent is d.
  36.       if (d < 0 || d > deg) return 0; else return trms[d];
  37.    }
  38.  
  39.    public Poly sub (Poly q) throws NullPointerException {
  40.       //EFFECTS: If q is null throws NullPointerException else
  41.      // returns the Poly this - q.
  42.       return add (q.minus( ));
  43.    }
  44.  
  45.    public Poly minus ( ) {
  46.       //EFFECTS: Returns the Poly -this.
  47.       Poly r = new Poly(deg);
  48.       for (int i = 0; i < deg; i++) r.trms[i] = - trms[i];
  49.       return r;
  50.    }
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