Here is a simpler version of the add(Object, int) method from Section 3.4.9. Under what circumstances will it fail? How do you fix this problem?

Question

```
1 public void add( E e, int p ) {
2 if (( p < 0 ) || ( p > length ) )
3 throw new IndexOutOfBoundsException();
4 SLNode newnode = new SLNode ( e, null );
5
6 SLNode cursor = find( p – 1 );
7 addAfter( cursor, newnode );
8 length++;
9 }

```

Answer 1

If index is 0, find(index - 1) will cause an error (0-1 = -1). Here is the correction:

if ( p > 0 )
SLNode cursor = find(index-1);
else
SLNode cursor = head;