NullPointerException when reading file

Question

I am writing a program that requires me to read in a predetermined file and add the numbers given into polynomial format. I keep getting a NullPointerException when the code reaches the end of a file. Here is the snippit of code that gives me the error:

The error is occurring on line 11 and/or 12.

public IList<Integer, Term> add(IList<Integer, Term> p1, IList<Integer, Term> p2)
{
    IList<Integer, Term> addList = new LList<Integer, Term>();

    //If the keys of both list equal each other, add them to the term 
    //being placed inside of addList

    //
    if(p1.getSize() >= p2.getSize() || p2.getSize() <= p1.getSize()){
     //Here is where the error is happening --v
        for(int i = 0; i < 10; i++){
            if(p1.find(i).equals(p2.find(i))){
                Term t1 = p1.find(i);
                Term t2 = p2.find(i);

                int c1 = t1.getCoef();
                int c2 = t2.getCoef();
                int c3 = c1 + c2;

                Term t3 = new Term(c3, i);

                //Add the added term, at the location of the previously added terms location
                addList.add(i, t3);
            }
        }
    }
    return addList;
}

Any help with this program will be more than helpful. Thanks

Please identify the specific line where the NPE occurs. The line number will be in the stack trace that Java barfs to console when the problem occurs. — MarsAtomic, Oct 21 '14 at 01:19
To re-iterate, Please identify the specific line where the NPE occurs. — Scary Wombat, Oct 21 '14 at 01:28
If `p1` or `p2` is null then the problem is with the calling code. — Scary Wombat, Oct 21 '14 at 01:58

score 0 · Accepted Answer · answered Oct 21 '14 at 08:47

public IList<Integer, Term> add(IList<Integer, Term> p1, IList<Integer, Term> p2)
{
    IList<Integer, Term> addList = new LList<Integer, Term>();

    if (p1 == null || p2 == null) {
        return addList;
    }

    if(p1.getSize() >= p2.getSize() || p2.getSize() <= p1.getSize()){
        ...
    }

    ...
}

NullPointerException when reading file

1 Answers1