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

should be 4

I see

list3.add("C") will throw

because last node was null

and when you get it... and attempt to set next

the data was null, not the node itself I think

ahh ok

it must be the size then

get(this.size - 1) is returning null

```
ListNode last = get(this.size - 1);
if (last != null) {
last.next = newNode;
++this.size;
return true;
}
return false;
```

thanks

this would only happen adding first node to list I would think

what is this class?

data structures?

or Java class?

Data Structures

I actually have a Java developer certificate but it was a long time ago so I have to relearn everything

Got it same time as I graduated high school

when I took that class we used C

1999 😉

Java was its own class back then - the OOP class

I had to take a 3 part Java series to get into this class

It was part of my certificate

nice