Java

what is the advantage of declaring each variable in separate line?

Hello India 123

class Persons
{
    public String firstName;
    public String secondName;
    public String CNP;
    public String Email;

};

class NODE
{
    private NODE next;
    public Persons box = new Persons();
    public NODE(String firstName, String secondName, String CNP, String Email)
    {
        box.firstName = firstName;
        box.secondName = secondName;
        box.CNP = CNP;
        box.Email = Email;
    }
    public NODE GetNext()
    {
        return next;
    }
    public void SetNext(NODE next)
    {
        this.next = next;
    }
};

class SinglyLinkedList
{
    private NODE head;
    public SinglyLinkedList()
    {
        head = null;
    }
    public boolean isEmpty()
    {
        return head == null;
    }
    public void AddNODE(NODE newNode)
    {
        NODE temp = null;
        if (isEmpty())
            head = temp = newNode;
        else
        {
            temp.SetNext(newNode);
            temp = newNode;
        }
        temp.SetNext(null);
    }
    public void Print()
    {
        NODE temp = head;
        while (temp != null)
        {
            System.out.print("\n First Name   : " + temp.box.firstName);
            System.out.print("\n Second Name  : " + temp.box.secondName);
            System.out.print("\n CNP          : " + temp.box.CNP);
            System.out.print("\n Email        : " + temp.box.Email);
            temp = temp.GetNext();
            System.out.print("\n");
        }
    }
};

public class MyClass
{
    public static void main(String args[])
    {
        SinglyLinkedList ptr = new SinglyLinkedList();

        NODE obj1 = new NODE("Dragu", "Stelian", "1811226284570", "dragu_stelian@yahoo.com");
        NODE obj2 = new NODE("Popescu", "Mircea", "1891226284462", "popescu.mircea@yahoo.com");
        
        ptr.AddNODE(obj1);
        ptr.AddNODE(obj2);

        ptr.Print();
    }
}