Linked List NullPointerException Java

Question

In LinkedList we normally assign null value to last node and also use this condition to check for the last node.

I am checking for the last node with the same condition either its "next" node link is null or not. But I'm unable to handle NullPointerException when I get null value by the method "getNext".

while(lastNode.getNext() != null)
{
lastNode= lastNode.getNext();
}

Are you sure this piece of code throwing a NullPointerException? — Salih Erikci
– Salih Erikci, Commented Nov 18, 2014 at 21:47
@elephont something like public Node<T> getNext() { return next; } - that's not what the issue is. — Dawood ibn Kareem
– Dawood ibn Kareem, Commented Nov 18, 2014 at 21:53

Shkodran Gerguri · Accepted Answer · 2014-11-18 21:57:10Z

1

I assume this is a custom implementation of a LinkedList; java.util.LinkedList does not have a getNext() method.

That said, what you want is:

while (current != null) {
    past = current;
    current = current.getNext();
}

return past;

I am assuming here that you want to return the last node, and that past is a variable of the same type as current.

edited Nov 18, 2014 at 21:57

answered Nov 18, 2014 at 21:50

Shkodran Gerguri

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