Java Program For Writing A Function To Delete A Linked List

Algorithm For Java:
In Java, automatic garbage collection happens, so deleting a linked list is easy. Just need to change head to null.

Implementation:

Java

// Java program to delete a linked list
class LinkedList
{
    // Head of the list
    Node head;

    // Linked List node
    class Node
    {
        int data;
        Node next;
        Node(int d)
        {
            data = d;
            next = null;
        }
    }

    // Function deletes the entire
    // linked list
    void deleteList()
    {
        head = null;
    }

    // Inserts a new Node at front
    // of the list.
    public void push(int new_data)
    {
        /* 1 & 2: Allocate the Node &
                  Put in the data*/
        Node new_node = new Node(new_data);

        // 3. Make next of new Node as head
        new_node.next = head;

        // 4. Move the head to point to new Node
        head = new_node;
    }

    public static void main(String [] args)
    {
        LinkedList llist = new LinkedList();

        // Use push() to construct list
        // 1->12->1->4->1
        llist.push(1);
        llist.push(4);
        llist.push(1);
        llist.push(12);
        llist.push(1);

        System.out.println("Deleting the list");
        llist.deleteList();

        System.out.println("Linked list deleted");
    }
}
// This code is contributed by Rajat Mishra

Output:

Deleting linked list
Linked list deleted

Time Complexity: O(n) 
Auxiliary Space: O(1)

Please refer complete article on Write a function to delete a Linked List for more details!