Java program to insert a new node at the end of the Circular Linked List
public class InsertAtEnd {
//Represents the node of list.
public class Node{
int data;
Node next;
public Node(int data) {
this.data = data;
}
}
//Declaring head and tail pointer as null.
public Node head = null;
public Node tail = null;
//This function will add the new node at the end of the list.
public void addAtEnd(int data){
//Create new node
Node newNode = new Node(data);
//Checks if the list is empty.
if(head == null) {
//If list is empty, both head and tail would point to new node.
head = newNode;
tail = newNode;
newNode.next = head;
}
else {
//tail will point to new node.
tail.next = newNode;
//New node will become new tail.
tail = newNode;
//Since, it is circular linked list tail will points to head.
tail.next = head;
}
}
//Displays all the nodes in the list
public void display() {
Node current = head;
if(head == null) {
System.out.println("List is empty");
}
else {
System.out.println("Adding nodes to the end of the list: ");
do{
//Prints each node by incrementing pointer.
System.out.print(" "+ current.data);
current = current.next;
}while(current != head);
System.out.println();
}
}
public static void main(String[] args) {
InsertAtEnd cl = new InsertAtEnd();
//Adding 1 to the list
cl.addAtEnd(1);
cl.display();
//Adding 2 to the list
cl.addAtEnd(2);
cl.display();
//Adding 3 to the list
cl.addAtEnd(3);
cl.display();
//Adding 4 to the list
cl.addAtEnd(4);
cl.display();
}
}
Output:
Adding nodes to the end of the list:
1
Adding nodes to the end of the list:
1 2
Adding nodes to the end of the list:
1 2 3
Adding nodes to the end of the list:
1 2 3 4
