Thread: Reading input into an ArrayList

Hey guys I need help reading input into an ArrayList which I will use to construct my polynomials
any ideas on how to do this ??
My code is below

 */
package poly;
 
import java.util.ArrayList;
import java.util.Scanner;
 
/**
 *
 * 
 */
public class Poly {
 
    private ArrayList<Integer> coefficients;
 
    public Poly()
    {
 
    }
    public Poly(ArrayList<Integer> coefficient) {
        this.coefficients = coefficient;
    }
 
    public void show() {
        for (int i = coefficients.size() - 1; i >= 0; i--) {
            if(coefficients.get(i)>=0 && i!=coefficients.size()-1)
            { 
                System.out.print("+");
            }
            System.out.print(coefficients.get(i));
            if (i != 0) {
                System.out.print("x");
                System.out.print("^" + i);
                System.out.print(" ");
            }
        }
        System.out.println("");// prints new line 
    }
 
    public Poly add(Poly otherPoly) {
 
 
        //We are going to add the coefficients of the current object as well as the 
        //object that is being passed on to the method
        ArrayList<Integer> sum = new ArrayList<Integer>();
        //We are checking if the degree of coefficients of the current object and the
        //object being passed into the method are the same
        if (this.coefficients.size() == otherPoly.coefficients.size()) {
 
            //Iterating over each element in the object.
            for (int i = 0; i < coefficients.size(); i++) {
 
                //Adding the coefficients of the currrent object and the correspondeing
                //coefficients the object that is being passed.
                sum.add(this.coefficients.get(i) + otherPoly.coefficients.get(i));
 
            }
 
 
        }
        //Creating a new polynomial to pass the arraylist that has just  been created.
        Poly sumPoly = new Poly(sum);
        //Returning the polynomial.
        return (sumPoly);
    }
 
    public Poly subtract(Poly otherPoly) {
 
 
        //We are going to add the coefficients of the current object as well as the 
        //object that is being passed on to the method
        ArrayList<Integer> takeAway = new ArrayList<Integer>();
        //We are checking if the degree of coefficients of the current object and the
        //object being passed into the method are the same
        if (this.coefficients.size() == otherPoly.coefficients.size()) {
 
            //Iterating over each element in the object.
            for (int i = 0; i < coefficients.size(); i++) {
 
                //Adding the coefficients of the currrent object and the correspondeing
                //coefficients the object that is being passed.
                takeAway.add(this.coefficients.get(i) - otherPoly.coefficients.get(i));
 
            }
 
        }
 
        //Creating a new polynomial to pass the arraylist that has just  been created.
        Poly takeAwayPoly = new Poly(takeAway);
        //Returning the polynomial.
        return (takeAwayPoly);
    }
 
 
public void read()  
{
 Scanner in= new Scanner(System.in);
 System.out.println("Please Enter the degree of the polynomial");
 int degree=in.nextInt();
 for(int i=0; i<=degree; i++)
 {
     System.out.println("Please enter the enter coefficient for the"+ i+"exponent");
 }
 int[] coefficientArray=new int[degree];
 
}
 
//MAIN CLASS BELOW 
 
 public static void main(String[] args) {
       // int[] coefficient = {4, 3, 2};
        ArrayList<Integer> coefficients = new ArrayList<Integer>();
        coefficients.add(4);
        coefficients.add(2);
        coefficients.add(1);
        coefficients.add(4);
 
        Poly one = new Poly(coefficients);
 
        ArrayList<Integer> coefficients_2 = new ArrayList<Integer>();
        coefficients_2.add(5);
        coefficients_2.add(3);
        coefficients_2.add(1);
        coefficients_2.add(5);
 
        Poly two = new Poly(coefficients_2);
 
        one.show();
        two.show();
 
        //Need to confirm if not printing the error mesage is okay.
        Poly three = one.subtract(two);
        three.show();
 
        Poly four = one.add(two);
        four.show();
 
 
 
 
    }
}