DoublyLinkedList.java - Your implementation of a...

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/** * Your implementation of a DoublyLinkedList * * @author Peiyu Wang * @version 1.0 */ public class DoublyLinkedList<T> implements LinkedListInterface<T> { // Do not add new instance variables. private LinkedListNode<T> head; private LinkedListNode<T> tail; private int size; @ Override public void addAtIndex(int index, T data) { if (data == null) { throw new IllegalArgumentException("Error,data is null"); } if (index < 0 || index > size) { throw new IndexOutOfBoundsException("Error, index is negative" + "or larger than size"); } LinkedListNode<T> tempnode = new LinkedListNode(data); if (index == 0) { if (head == null) { head = tempnode; tail = tempnode; } else { tempnode.setNext(head); tempnode.setPrevious(null); head.setPrevious(tempnode); head = tempnode; } } else if (index == size) { if (tail == null) { head = tempnode; tail = tempnode; } else { tempnode.setNext(null); tempnode.setPrevious(tail); tail.setNext(tempnode); tail = tempnode; } } else { LinkedListNode<T> current = head; for (int i = 0; i < index; i++) {
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current = current.getNext(); } tempnode.setNext(current); tempnode.setPrevious(current.getPrevious()); (current.getPrevious()).setNext(tempnode); current.setPrevious(tempnode);
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