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Java Program to Implement VList

Last Updated : 17 Feb, 2022
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VList is a data structure that combines fast indexing of arrays with the easy extension of singly-linked lists. VList generally supports the following functions.

  • Insert Element
  • Get Element at index k
  • Clear List
  • Display List
  • Etc.

VList has rows connected as Singly Linked List where the Nth row contains maximum 2^N elements.



[1, 3]
[5, 1, 5, 8]
[10, 12, 5, 9, 1, 0, 8, 7]
[3, 5, 7]

VList is Filled first Left to Right Then Top to Bottom.



// Java Program to Implement VList
import java.util.*;
// This will act as each row of VList
class VListNode {
    VListNode next;
    List<Integer> list;
    public VListNode()
        next = null;
        list = new ArrayList<Integer>();
class VList {
    private VListNode start;
    private VListNode end;
    private int nodeNumber;
    private int size;
    // Constructor of VList
    public VList()
        start = null;
        end = null;
        nodeNumber = 0;
        size = 0;
    // Check if VList is Empty or Not
    public boolean isEmpty() { return start == null; }
    // Get Number of Elements in VList
    public void getSize()
        System.out.println("VList size : " + size);
    // Make VList Empty
    public void clearVList()
        start = null;
        end = null;
        nodeNumber = 0;
        size = 0;
        System.out.println("VList is Cleared");
    // Insert a new Element in VList
    public void insert(int x)
        int n = (int)Math.pow(2, nodeNumber);
        if (start == null) {
            start = new VListNode();
            end = start;
        if (end.list.size() + 1 <= n) {
        else {
            VListNode tempNode = new VListNode();
   = tempNode;
            end = tempNode;
    // Get value of Element at index k in VList
    public void searchElementWithPosition(int k)
        System.out.print("Element at position " + k
                         + " is = ");
        if (k < 1 || k > size) {
            System.out.println("Does not Exist");
        VListNode startTemp = start;
        while (k >= startTemp.list.size()) {
            k -= startTemp.list.size();
            startTemp =;
    // Print full VList
    public void displayVList()
        System.out.print("VList : ");
        if (size == 0) {
        VListNode startTemp = start;
        int num = 0;
        while (startTemp != null) {
            for (int i = 0; i < startTemp.list.size();
                 i++) {
                                 + " ");
            startTemp =;
class GFG {
    public static void main(String[] args)
        // Driver Code
        // Initialize Vlist
        VList vlist = new VList();
        int[] arr
            = new int[] { 9, 1, 5, 4, 3, 5, 2, 1, 0, 8 };
        // Insert Elements in VList
        for (int val : arr) {
        // Display VList
        // Search 1st Element
        // Search 5th Element
        // Search 8th Element
        // Make List Empty
        System.out.println("Vlist IsEmpty = "
                           + vlist.isEmpty());


VList : 
1 5 
4 3 5 2 
1 0 8 

Element at position 1 is = 9

Element at position 5 is = 3

Element at position 8 is = 1

VList size : 10

VList is Cleared

Vlist IsEmpty = true

Time Complexity:

  • Insert operation: O(1) 
  • Search operation: O(log(n))
  • Display: O(n)
  • Get Size & Check Empty: O(1)

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