GildedTruth :
So I'm coding in Java, and I had to make a LinkedList manually. It is doubly linked, and the tail's next pointer points to null. I'm using this to iterate through the list until I reach the end for a sorting algorithm (bubble sort).
Node<?> current = a.getHead();
while (current.getNext() != null) { //this line throw a NullPointerException
//sorting algorithm
current = current.getNext();
}
Here's the code for getNext() as well:
Node<?> current = a.getHead();.
Why is Java throwing a NullPointerException here?
Dipankar Baghel :
Problem is in line Node<?> current = a.getHead();
a.getHead(); is returning null.
Please check like -
while (current != null && current.getNext() != null) {
//sorting algorithm
current = current.getNext();
}
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