I want to modify the below code to read the Polynomial Terms from a text file (vs. hard-coded values)

Furthermore, read data from text file in the format:

P1 = 3 5 1 -1 0 8

P2 = 5 6 2 -1 1 7 0 -4

etc...

Name the values P(x) and input the remaining data... Any advice?

Code :

import java.util.*; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.text.*; public class PolynomialTest { private Monomial head; private double TOLERANCE = 0.00000001; /***** the Monomial (inner) class ********************************/ private class Monomial { private DecimalFormat precision = new DecimalFormat("#.####"); private int exp; // coeff * x^exp private double coeff; private Monomial next; public Monomial(int exp, double coeff, Monomial next) { this.exp = exp; this.coeff = coeff; this.next = next; } public String toString() { String form = precision.format(Math.abs(coeff)); if(exp == 0) return form ; else if(exp == 1) return form + "*x"; else return form +"*x^" + exp; } public boolean equals(Monomial mono) { return exp == mono.exp && coeff == mono.coeff; } } public PolynomialTest() { head = null; } /** * Adds a new term into the polynomial, assuming that the polynomial * is sorted in order from smallest to largest exponent. */ public void addTerm(int exp, double coeff) { if( Math.abs(coeff) < TOLERANCE ) return; if( head == null || exp < head.exp ) { head = new Monomial(exp, coeff, head); return; } Monomial cur = head; Monomial prev = null; while( cur != null && exp > cur.exp) { prev = cur; cur = cur.next; } if( cur == null || exp != cur.exp ) prev.next = new Monomial(exp, coeff, cur); else { cur.coeff += coeff; if( Math.abs(cur.coeff) < TOLERANCE ) if(prev != null) prev.next = cur.next; else head = head.next; } } public String toString() { StringBuffer sb = new StringBuffer(); for(Monomial tmp = head; tmp != null; tmp = tmp.next) if(tmp.coeff < 0 ) sb.append(" - " + tmp.toString()); else sb.append(" + " + tmp.toString()); return sb.toString(); } /** * Adds two polynomials * The method does not change the original polynomial. */ public PolynomialTest add(PolynomialTest poly) { PolynomialTest res = clone(); for(Monomial tmp = poly.head; tmp != null; tmp = tmp.next) res.addTerm(tmp.exp, tmp.coeff); return res; } public PolynomialTest clone() { PolynomialTest res = new PolynomialTest(); for(Monomial tmp = head; tmp != null; tmp = tmp.next) res.addTerm(tmp.exp, tmp.coeff); return res; } public boolean equals(PolynomialTest poly) { Monomial tmp1 = head; Monomial tmp2 = poly.head; while(tmp1 != null && tmp2 != null) { if( !tmp1.equals(tmp2) ) return false; tmp1 = tmp1.next; tmp2 = tmp2.next; } return true; } /** * Multiplies by a number * The method does not change the original polynomial. */ public PolynomialTest multiply(double num) { PolynomialTest res = clone(); for(Monomial tmp = res.head; tmp != null; tmp = tmp.next) tmp.coeff *= num; return res; } /** * Returns a new polynomial that is the derivative of this polynomial. */ public PolynomialTest diff() { PolynomialTest res = new PolynomialTest(); for(Monomial tmp = head; tmp != null; tmp = tmp.next) { if(tmp.exp != 0) res.addTerm(tmp.exp - 1, tmp.coeff * tmp.exp ); } return res; } /** * Computes the polynomial at x = value */ public double eval(double value) { double res = 0; for(Monomial tmp = head; tmp != null; tmp = tmp.next) { res += tmp.coeff * Math.pow(value, tmp.exp); } return res; } public static void main(String[] args) { PolynomialTest first = new PolynomialTest(); PolynomialTest second = new PolynomialTest(); System.out.println( "first" ); first.addTerm(1, 2.1); first.addTerm(4, 2); first.addTerm(3, 1); first.addTerm(0, 1.3); first.addTerm(4, 0.3); System.out.println( first ); System.out.println( ); System.out.println( "second" ); second.addTerm(4, -2.3); second.addTerm(2, 1); second.addTerm(0, -1.3); second.addTerm(1, 0.3); System.out.println( second ); System.out.println( ); System.out.println( "compare first with second" ); System.out.println( first.equals(second) ); System.out.println( "compare first wih first" ); System.out.println( first.equals(first) ); System.out.println( ); System.out.println( "add first and second" ); PolynomialTest third = first.add(second); System.out.println( third ); System.out.println( first ); System.out.println( second ); System.out.println( ); System.out.println( "multiply first by 0.2" ); PolynomialTest fourth = first.multiply(0.2); System.out.println( fourth ); System.out.println( first ); System.out.println( ); System.out.println( "differentiate first" ); PolynomialTest diff = first.diff(); System.out.println( diff ); System.out.println( first ); System.out.println( ); System.out.println( "eval first at x = 1.5" ); System.out.println( first.eval(1.5) ); System.out.println( ); String content = new String(); String name = new String(); File file = new File("test.txt"); LinkedList<String> list = new LinkedList<String>(); try { Scanner sc = new Scanner(new FileInputStream(file)); while (sc.hasNext()) { name = sc.next(); content = sc.nextLine(); list.add(content); } sc.close(); } catch (FileNotFoundException fnfe) { fnfe.printStackTrace(); } catch (Exception e) { e.printStackTrace(); System.out.println("\nProgram terminated Safely..."); } Iterator<String> i = list.iterator(); while (i.hasNext()) { System.out.println(name + i.next() + "\n"); } } }