Count nodes of linked list

//Count nodes of linked list

import java.util.*;
class Node{
    int data;
    Node next;
    
    Node(int a){
        data = a;
        next = null;
    }    
}

class Node {
    int data;
    Node next;

    Node(int a){  data = a; next = null; }
}

class Solution {
    public static int getCount(Node head) {
        Node curr = head;
        int count = 0;
        
        while(curr != null) {
            count++;
            curr = curr.next;
        }
        
        return count;
    }
}

class LinkedList {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int t=sc.nextInt();

        while(t-- > 0) {
            int n=sc.nextInt();
            Node head = new Node(sc.nextInt());
            Node tail = head;

            for(int i = 0; i < n - 1; i++) {
                tail.next = new Node(sc.nextInt());
                tail = tail.next;
            }
            
            Solution ob = new Solution();
            System.out.println(ob.getCount(head));
        }
    }  
}