Question

In java we will need to create a method that takes the array {1,2,3,4,5} and returns the head reference to a linkedList. We will also need to display the linked list in out main method.

Answer 1

Code:

public class LinkedListDisplay {

    public static void main(String[] args) {

        LinkedListDisplay listDisplay = new LinkedListDisplay();
        Node head = listDisplay
            .generateLinkedList(new int[]
            {
                1, 2, 3, 4, 5
            });

        // display the list.
        Node temp = head;
        while (temp != null) {

            System.out.print(temp.item + " ");
            temp = temp.next;

        }

        System.out.println();
    }

    private Node generateLinkedList(int[] elements) {

        Node head = new Node(elements[0]);
        Node temp = head;

        for (int i = 1; i < elements.length; ++i) {
            Node newNode = new Node(elements[i]);
            temp.next = newNode;
            temp = newNode;
        }

        return head;

    }

    class Node {

        int item;
        Node next;

        Node(int item) {
            this.item = item;
        }
    }

}

Snapshot of the output:

Snapshot of the code:

Let me know if anything is not clear.