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Questions and Answers
What is the primary purpose of the Node class constructor?
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?
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?
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?
What data type can the data field in the Node class hold?
What is the expected behavior of the getNext method?
What is the expected behavior of the getNext method?
What is the initial value of the 'next' field when a Node object is created?
What is the initial value of the 'next' field when a Node object is created?
The data field in the Node class can hold multiple types of data at the same time.
The data field in the Node class can hold multiple types of data at the same time.
What does the setNext method do in the Node class?
What does the setNext method do in the Node class?
In the Node class, the field that holds the reference to the next node is called the ______.
In the Node class, the field that holds the reference to the next node is called the ______.
Match the following methods with their functionality:
Match the following methods with their functionality:
What happens when a new Node is inserted into the empty linked list?
What happens when a new Node is inserted into the empty linked list?
How does the insert method update the root if it already has nodes?
How does the insert method update the root if it already has nodes?
Which statement best describes the toString method's functionality?
Which statement best describes the toString method's functionality?
What is the result of calling toString on an empty linked list?
What is the result of calling toString on an empty linked list?
Which scenario will yield a linked list with two nodes after insertion?
Which scenario will yield a linked list with two nodes after insertion?
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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 typeT
andnext
of typeNode
. - 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 thedata
field with the value passed in asd
and setsnext
tonull
, indicating the node is currently the last node. - The
getNext()
method returns the value of thenext
field, allowing access to the next node in the linked list. - The
setNext(Node next)
method updates thenext
field with the providedNode
, allowing manipulation of the linked list structure. - The
getData()
method returns the value of thedata
field, providing access to the data stored in the node.
Node Class
- The
Node
class utilizes a generic type parameterT
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 thenext
pointer tonull
. - The
getNext
method returns the current node'snext
pointer, allowing traversal to the subsequent node in the list. - The
setNext
method allows modifying thenext
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 aNode
class, which likely holds data and a reference to the next node in the list.
Constructor (MyLinkedList)
- The
MyLinkedList
constructor initializes theroot
(head) of the list tonull
, indicating an empty list.
getRoot() Method
- The
getRoot()
method returns theroot
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
isnull
), thenewNode
becomes theroot
. - If the list isn't empty, the
newNode
is set to point to the currentroot
, and theroot
is updated to be thenewNode
.
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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