How does the .nextnode points to the next node I'm confused here

Question

public class Singly_linked_list {
//Represent a node of the singly linked list
class Node {
int data;
Node nextnode;
Node(int data) {
this.data = data;
this.nextnode = null;
}
}
//Represent the head and tail of the singly linked list
public Node head = null;
public Node tail = null;
//addNode() will add a new node to the list
public void addNode(int data) {
//Create a new node
Node newNode = new Node(data);
//Checks if the list is empty
if(head == null) {
//If list is empty, both head and tail will point to new node
head = newNode;
tail = newNode;
}
else {
//newNode will be added after tail such that tail's next will point to newNode
tail.nextnode = newNode;
//newNode will become new tail of the list
tail = newNode;
}
}

Answer 1

Martin Taylor i have a doubt are collections and data structures are same?

Answer 2

If yes I can't find singly and doubly linked list all i can find is only linked list

Answer 3

Thanks dude!! I felt frustrated to learn all of these in java!! Thx now I can rest in peace 💀