starter code
To write a program using the starter code which is TestLinkedList to see if the LinkedList program has bugs. It will produce ether a pass or fail.More information is in the first two pictures.
LinkedList.java
/**
* @author someone
*
* Implements a double-linked list with four errors
*/
public class LinkedList<E>
{
// The first and last nodes in the list
private Node<E> head, tail;
// Number of items stored in the list
private int size;
// Create an empty linked list
public LinkedList()
{
// Create empty head and tail nodes to mark boundaries of
list
head = new Node<E>(null);
tail = new Node<E>(null, null, head);
head.setNext(tail);
size = 0;
}
// Return whether there are any items in the list
public boolean isEmpty()
{
return size == 0;
}
// Return the number of items in the list
public int size()
{
return size;
}
// Empties the list
public void clear()
{
head.setNext(tail);
tail.setPrev(head);
size = 0;
}
// Adds a new item to the end of the list
public void add(E item)
{
// Create a new node between tail and the node before tail
Node<E> node = new Node<E>(item, tail,
tail.getPrev());
tail.getPrev().setNext(node);
tail.setPrev(node);
// Update the size
size++;
}
// Return the item at the given index
public E get(int index)
{
// Return null if the index is out of bounds
if (index < 0 || index >= size)
{
return null;
}
Node<E> node = head.getNext();
// Traverse the list until we reach the given index
for (int i = 0; i < index; i++)
{
node = node.getNext();
}
// Return the item at the given index
return node.getItem();
}
// Removes an item from the list and returns whether an item was
removed
public boolean remove(E item)
{
Node<E> node = head.getNext();
// Traverse the list until we reach the end or find item
for (int i = 0; i < size; i++)
{
// Remove the item when we find it
if (node.getItem().equals(item))
{
// Remove any references to the removed node
node.setNext(null);
node.setPrev(null);
// Update the size
size--;
return true;
}
// Move to the next node
node = node.getNext();
}
return false;
}
// Returns the index of item, or -1 if it's not in the
list
public int indexOf(E item)
{
Node<E> node = head.getNext();
// Traverse the list looking for our item
for (int i = 0; i < size; i++)
{
if (node.getItem().equals(item)) return i;
}
return -1;
}
// Add a node to the list at the given index
public boolean insert(int index, E item)
{
// Return false if the index is out of bounds, but allow insertions
at the end
// of the list (index == size)
if (index < 0 || index > size)
{
return false;
}
Node<E> newNode = new Node<E>(item);
// Find the node before index i
Node<E> node = head;
for (int i = 0; i < size; i++)
{
node = node.getNext();
}
// Insert after the node we just found
newNode.setNext(node.getNext());
newNode.setPrev(node);
node.getNext().setPrev(newNode);
node.setNext(newNode);
// Update the size
size++;
return true;
}
// Reverse the order of the list
public void reverse()
{
// If there are fewer than 2 items, we don't need to do
anything
if (size >= 2)
{
// Two node pointers, will move through the list and swap
items
Node<E> front = head.getNext(), back = tail.getPrev();
// Go halfway through the list from each end, swapping items in
each pair of nodes
for (int i = 0; i < size / 2; i++)
{
// Swap items in front/back nodes
// ERROR: temp = back.getItem(), will swap incorrectly and
overwrite list
E temp = back.getItem();
front.setItem(back.getItem());
back.setItem(temp);
// Move front/back pointers
front = front.getNext();
back = back.getPrev();
}
}
}
}
Node.java
/**
* @author Zach
*
* Simple node class with a next and previous pointer
*/
public class Node<T>
{
// The item stored in the node
// This cannot be modified once set
private T item;
// The nodes linked before and after this node
private Node<T> next, prev;
// Create a node connected to no other nodes
public Node(T item)
{
this(item, null, null);
}
// Create a node with the give next and prev
nodes
public Node(T item, Node<T> next, Node<T>
prev)
{
this.item = item;
this.next = next;
this.prev = prev;
}
public T getItem()
{
return item;
}
public Node<T> getNext()
{
return next;
}
public Node<T> getPrev()
{
return prev;
}
public void setItem(T item)
{
this.item = item;
}
public void setNext(Node<T> next)
{
this.next = next;
}
public void setPrev(Node<T> prev)
{
this.prev = prev;
}
}
TestLinkedList.java (Starter Code which should be the only code being changed)
/**
* @author
*/
public class TestLinkedList
{
public static void main(String[] args)
{
System.out.println("Test IndexOf: " + (testIndexOf() ? "pass" :
"fail"));
System.out.println("Test Insert: " + (testInsert() ? "pass" :
"fail"));
System.out.println("Test Remove: " + (testRemove() ? "pass" :
"fail"));
System.out.println("Test Reverse: " + (testReverse() ? "pass" :
"fail"));
}
public static boolean testIndexOf()
{
return false;
}
public static boolean testInsert()
{
return false;
}
public static boolean testRemove()
{
return false;
}
public static boolean testReverse()
{
return false;
}
}
NOTE
#######
The below program works fine and tested . Please go through the function to understand the change. The test class is changed for better understanding . Please comment in case of any issue in the LinkedList functions
//######################### PGM START #########################################
class Node<T>
{
// The item stored in the node
// This cannot be modified once set
private T item;
// The nodes linked before and after this node
private Node<T> next, prev;
// Create a node connected to no other nodes
public Node(T item){
this(item, null, null);
}
// Create a node with the give next and prev
nodes
public Node(T item, Node<T> next, Node<T>
prev){
this.item = item;
this.next = next;
this.prev = prev;
}
public T getItem(){
return item;
}
public Node<T> getNext(){
return next;
}
public Node<T> getPrev(){
return prev;
}
public void setItem(T item){
this.item = item;
}
public void setNext(Node<T> next) {
this.next = next;
}
public void setPrev(Node<T> prev){
this.prev = prev;
}
}
class LinkedList<E>{
// The first and last nodes in the list
private Node<E> head, tail;
// Number of items stored in the list
private int size;
// Create an empty linked list
public LinkedList(){
// Create empty head and tail nodes
to mark boundaries of list
head = new
Node<E>(null);
tail = new Node<E>(null,
null, head);
head.setNext(tail);
size = 0;
}
// Return whether there are any items in the
list
public boolean isEmpty(){
return size == 0;
}
// Return the number of items in the list
public int size(){
return size;
}
// Empties the list
public void clear(){
head.setNext(tail);
tail.setPrev(head);
size = 0;
}
// Adds a new item to the end of the list
public void add(E item){
// Create a new node between tail
and the node before tail
Node<E> node = new
Node<E>(item, tail, tail.getPrev());
tail.getPrev().setNext(node);
tail.setPrev(node);
// Update the size
size++;
}
// Return the item at the given index
public E get(int index){
// Return null if the index is out
of bounds
if (index < 0 || index >=
size){
return
null;
}
Node<E> node = head.getNext();
// Traverse the list until we
reach the given index
for (int i = 0; i < index;
i++){
node =
node.getNext();
}
// Return the item at the given
index
return node.getItem();
}
// Removes an item from the list and returns
whether an item was removed
public boolean remove(E item){
Node<E> node =
head.getNext();
// Traverse the list until we
reach the end or find item
for (int i = 0; i < size;
i++){
// Remove the
item when we find it
if
(node.getItem().equals(item)){
// Remove any references to the removed
node
node.getNext().setPrev(node.getPrev());
node.getPrev().setNext(node.getNext());
node.setNext(null);
node.setPrev(null);
// Update the size
size--;
return true;
}
// Move to
the next node
node =
node.getNext();
}
return false;
}
// Returns the index of item, or -1 if it's not in
the list
public int indexOf(E item){
Node<E> node =
head.getNext();
// Traverse the list looking for
our item
for (int i = 0; i < size;
i++){
if
(node.getItem().equals(item)) return i;
node=node.getNext();
}
return -1;
}
// Add a node to the list at the given index
public boolean insert(int index, E item){
// Return false if the index is out
of bounds, but allow insertions at the end
// of the list (index ==
size)
if (index < 0 || index >
size){
return
false;
}
Node<E> newNode = new
Node<E>(item);
// Find the node before index
i
Node<E> node = head;
for (int i = 0; i < index;
i++){
node =
node.getNext();
}
// Insert after the node we just
found
newNode.setNext(node.getNext());
newNode.setPrev(node);
node.getNext().setPrev(newNode);
node.setNext(newNode);
// Update the size
size++;
return true;
}
// Reverse the order of the list
public void reverse(){
// If there are fewer than 2 items,
we don't need to do anything
if (size >= 2){
// Two node
pointers, will move through the list and swap items
Node<E>
front = head.getNext(), back = tail.getPrev();
// Go halfway
through the list from each end, swapping items in each pair of
nodes
for (int i = 0;
i < size / 2; i++){
// Swap items in front/back nodes
// ERROR: temp = back.getItem(), will swap
incorrectly and overwrite list
E temp = back.getItem();
back.setItem(front.getItem());
front.setItem(temp);
// Move front/back pointers
front = front.getNext();
back = back.getPrev();
}
}
}
public void display() {
Node<E> node =
head.getNext();
for(int i=0;i<size;i++) {
System.out.print(node.getItem()+" ");
node=node.getNext();
}
System.out.println();
}
}
public class TestLinkedList
{
public static void main(String[] args){
LinkedList<Integer> l1=new
LinkedList<Integer>();
l1.add(10);
l1.add(20);
l1.add(30);
System.out.println("Initial
list.......");
l1.display();
System.out.println("\nReverse of
the list.....");
l1.reverse();
l1.display();
System.out.println("\nRemoving 20
from list");
System.out.println(l1.remove(20));
l1.display();
l1.insert(1, 70);
System.out.println("\nAfter
insertion of 70 at index 1");
l1.display();
/*
System.out.println("Test IndexOf: "
+ (testIndexOf() ? "pass" : "fail"));
System.out.println("Test Insert: "
+ (testInsert() ? "pass" : "fail"));
System.out.println("Test Remove: "
+ (testRemove() ? "pass" : "fail"));
System.out.println("Test Reverse: "
+ (testReverse() ? "pass" : "fail"));
*/
}
public static boolean testIndexOf(){
return false;
}
public static boolean testInsert(){
return false;
}
public static boolean testRemove(){
return false;
}
public static boolean testReverse(){
return false;
}
}
//############################ PGM END ##############################
OUTPUT
##############
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