where do you get the null?

what line

the same line as the if statement

should I paste the entire files in here or would that be too big?

for (int i = 0; i < index && cur != null; ++i)

zip them and email to [email protected]

It's too late for that

since it has to be turned in soon

but thanks

I'll just see what I can get fixed now

try changes to that for loop

okay thanks

what would cause the for look to cause a null pointer exception?

I suspect cur is null

and the recursion

```public ListNode get(int index) throws IndexOutOfBoundsException{
ListNode cur = head;
for (int i = 0; i < index && cur != null; i++) {
if (i == index) {
return get(i);
}
cur = cur.next;
}
return null;
}
```

```return get(i);```

the recursion

oh ya

and what is head

that's definitely messing something up

head is defined earlier

member var?

```java
public MyLinkedList() {
this.head = new ListNode(null); //with a dummy head node
this.size = 0;
}
```

okay that exception is fixed I think

maybe let's see if we can do anything with one more thing

is this linked list or tree node?

linked list

huh I get a null pointer exception from somewhere else, too

```java
------------------testAddLast()----
Exception in thread "main" java.lang.NullPointerException
at MyLinkedList$ListNode.access$2(MyLinkedList.java:11)
at MyLinkedList.add(MyLinkedList.java:205)
at MyLinkedListTester.testAddLast(MyLinkedListTester.java:42)
at MyLinkedListTester.main(MyLinkedListTester.java:214)
```

```java
public static void testAddLast() { //passed
System.out.println("------------------testAddLast()----");
init();
list3.add("A");
System.out.println(list3);
list3.add("B");
System.out.println(list3);
list3.add(null);
System.out.println(list3);
list3.add("C");
System.out.println(list3);
drawLine();
}
```

```java
//Add the object e to the end of this list.
// it returns true, after e is successfully added.
public boolean add(Object e) {
ListNode newNode = new ListNode(e);
newNode.next = null;
get(this.size - 1).next = newNode;
this.size++;
return true;
}
```

any glaring problems here?

that get() could return null

hmmm

any ideas on how to fix that?

after init()

how many nodes in list3

println after init()

4

what is size