Node Class in Linked Lists

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Questions and Answers

What is the primary purpose of the Node class constructor?

  • To return the next node in the linked list
  • To set both data and next fields based on user input
  • To create a new node with a specific data value and set next to null (correct)
  • To initialize the data field and set the next node to a given node

Which method is used to retrieve the data stored in a Node object?

  • getNodeData()
  • fetchData()
  • getData() (correct)
  • retrieveData()

What would happen if the setNext method is never called on a Node object?

  • The next node will be set to the first node in the list
  • The next field will throw a null pointer exception
  • The next field will remain null (correct)
  • The next node will point to itself

What data type can the data field in the Node class hold?

<p>Any object type specified by the generic T (D)</p> Signup and view all the answers

What is the expected behavior of the getNext method?

<p>It retrieves the reference to the next node (A)</p> Signup and view all the answers

What is the initial value of the 'next' field when a Node object is created?

<p>null (C)</p> Signup and view all the answers

The data field in the Node class can hold multiple types of data at the same time.

<p>False (B)</p> Signup and view all the answers

What does the setNext method do in the Node class?

<p>It sets the next node to the specified node.</p> Signup and view all the answers

In the Node class, the field that holds the reference to the next node is called the ______.

<p>next</p> Signup and view all the answers

Match the following methods with their functionality:

<p>getNext = Retrieves the next node reference setNext = Sets the next node reference getData = Retrieves the stored data Node constructor = Initializes data and next fields</p> Signup and view all the answers

What happens when a new Node is inserted into the empty linked list?

<p>The new node becomes the root of the list. (C)</p> Signup and view all the answers

How does the insert method update the root if it already has nodes?

<p>It sets the new node as the next node of the current root. (C)</p> Signup and view all the answers

Which statement best describes the toString method's functionality?

<p>It creates a string representation of all node data. (A)</p> Signup and view all the answers

What is the result of calling toString on an empty linked list?

<p>It returns an empty string. (D)</p> Signup and view all the answers

Which scenario will yield a linked list with two nodes after insertion?

<p>Inserting a new node into an already populated list. (C)</p> Signup and view all the answers

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Study Notes

Node Class

  • The Node class is designed to represent a single node in a linked list.
  • The Node class has two private fields: data of type T and next of type Node.
  • The data field stores the actual data payload of the node.
  • The next field points to the next node in the linked list.
  • The constructor Node(T d) initializes the data field with the value passed in as d and sets next to null, indicating the node is currently the last node.
  • The getNext() method returns the value of the next field, allowing access to the next node in the linked list.
  • The setNext(Node next) method updates the next field with the provided Node, allowing manipulation of the linked list structure.
  • The getData() method returns the value of the data field, providing access to the data stored in the node.

Node Class

  • The Node class utilizes a generic type parameter T to represent the data type stored in each node.
  • The data field stores the actual data associated with the node.
  • The next field serves as a pointer to the subsequent node in the linked list.
  • The Node constructor initializes a new node with the provided data and sets the next pointer to null.
  • The getNext method returns the current node's next pointer, allowing traversal to the subsequent node in the list.
  • The setNext method allows modifying the next pointer, enabling the insertion or removal of nodes.
  • The getData method returns the data value stored in the current node.

MyLinkedList Class

  • The MyLinkedList class represents a linked list data structure.

Node Class (Implicit)

  • The MyLinkedList class assumes the existence of a Node class, which likely holds data and a reference to the next node in the list.

Constructor (MyLinkedList)

  • The MyLinkedList constructor initializes the root (head) of the list to null, indicating an empty list.

getRoot() Method

  • The getRoot() method returns the root of the linked list. It's used to access the head of the list.

insert() Method

  • The insert() method adds a new node (newNode) at the beginning of the linked list.
  • If the list is empty ( root is null), the newNode becomes the root.
  • If the list isn't empty, the newNode is set to point to the current root, and the root is updated to be the newNode.

toString() Method

  • The toString() method converts the linked list into a string representation.
  • It iterates through all nodes starting from the root.
  • The data of each node is appended to the message string, separated by a space.
  • The method returns the message, trimmed of any trailing spaces.

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