Effectively insert node at beginning of circular linked list in scala

Scala program for Effectively insert node at beginning of circular linked list . Here problem description and explanation.

// Scala Program 
// Insert node at beginning of circular linked list
// Using head and tail nodes

// Define class of linked list Node
class LinkNode(var data: Int,
	var next: LinkNode);
class CircularLinkedList(var head: LinkNode,
	var tail: LinkNode)
{
	def this()
	{
		this(null, null);
	}
	// Insert node at begining of circular linked list
	def insert(value: Int): Unit = {
		// Create a node
		var node: LinkNode = new LinkNode(value, this.head);
		if (this.tail == null)
		{
			// First node of linked list
			this.tail = node;
		}
		// Make new head
		this.head = node;
		// Connecting the last node to the top of the next field
		this.tail.next = this.head;
	}
	// Display node element of circular linked list
	def display(): Unit = {
		if (this.head == null)
		{
			println("Empty Linked List");
		}
		else
		{
			print("Linked List Element :");
			var temp: LinkNode = this.head;
			// iterate linked list
			while (temp != null)
			{
				// Display node
				print("  " + temp.data);
				if (temp == this.tail)
				{
					// Stop iteration
					// Or break;
					return;
				}
				// Visit to next node
				temp = temp.next;
			}
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: CircularLinkedList = new CircularLinkedList();
		// Add following linked list nodes
		task.insert(8);
		task.insert(7);
		task.insert(6);
		task.insert(5);
		task.insert(4);
		task.insert(3);
		task.insert(2);
		task.insert(1);
		// Display node
		task.display();
	}
}

Output

Linked List Element :  1  2  3  4  5  6  7  8


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