Answer Happy

Here's the link to the full question; it is for Java; I wouldappreciate for the full Java solution to the question:
https://docs.google.com/document/d/1Slt ... sp=sharing
Here's my current progress:
LinkedList.java (1 compiler error; how tofix??):
public class LinkedList <T> implements List<T> {
private class Node<T> { private T data; private Node<T> next; public Node(T data, Node<T> next) { this.data = data; this.next = next; } public Node(T data) { this(data, null); } public T getData() { return data; } public Node<T> getNext() { return next; } public void setData(T data) { this.data = data; } public void setNext(Node<T> next) { this.next = next; }}private Node<T> head;private Node<T> tail;private int size = 0;
public LinkedList() { head = null; tail = null;}
public Node<T> getHead() { return head; }
public Node<T> getTail() { return tail;}
@Overridepublic void addAtIndex(T data, int index) { if (index == 1 ){ if(isEmpty()) { head = newNode(data); tail = head; return; } Node<T> newNode = newNode(data); newNode.next = head; head = newNode; return; } Node<T> current = head; int count = 1; while(count < index-1) { count++; current =current.next; } Node<T> newNode = newNode(data); newNode.next = current.next; current.next = newNode;}
@Overridepublic T getAtIndex(int index) {
/** * Retrieves the data of the node that'sspecified. * @param index the index of the node whose datawe are retrieving */
Node<T> current = head; int val = 0; while (current != null && val != index ){ current = current.next; val += 1; } return current.getData(); } @Override public T removeAtIndex(int index) { /** * Removes the data at the specified index andreturns the data that was removed. * @param index removes the Node at thisindex */ Node<T> current = head; Node<T> prev = null; int count = 1; while(count < index) { count++; prev = current; current =current.getNext(); } prev.next = current.getNext(); current.next = null; return current.getData(); } @Override public T remove(T data) { /** * Removes the Node with the data passed in if aNode containing the data exists. * @param data the data to remove from theList */ Node<T> current = head; while (current != null) { if (current.getData() == data) { return data; } current = current.next; } return data; }
@Override public void clear() { /** * Clears the LinkedList - garbage collection isyour friend here. * THIS SOLUTION SHOULD CAN BE O(1) */ this.size = 0; this.head.data = null; this.head.next = null; } @Override public boolean isEmpty() { /** * Checks whether the LinkedList is empty ornot. * @return boolean value indicating whether it'sempty or not */ return head == null; } @Override public int size() { /** * Returns the size of the List * @return integer size of the list */ return size; }
}
Node.java (no compiler error; is itright??)
public class Node<T> { private T data; private Node<T> next; public Node(T data, Node<T> next) { this.data = data; this.next = next; } public Node(T data) { this(data, null); } public T getData() { return data; } public Node<T> getNext() { return next; } public void setData(T data) { this.data = data; } public void setNext(Node<T> next) { this.next = next; }}