How to add an object to an ArrayList in Java

I want to add an object to an ArrayList , but each time I add a new object to an ArrayList with 3 attributes: objt(name, address, contact) , I get an error.

import java.util.ArrayList; import java.util.Scanner; public class mainClass < public static void main(String args[])< Scanner input = new Scanner(System.in); System.out.println("Plz enter Name : "); String name = input.nextLine(); System.out.println("Plz enter Address : "); String address = input.nextLine(); System.out.println("Plz enter ContactNo : "); String contact = input.nextLine(); ArrayListContacts = new ArrayList(); Data objt = new Data(); Contacts.add(objt.Data(name, address, contact)); > >

Here, Data is the class of which I'm trying to create an object and pass it to an ArrayList .

public class Data < private String name = ""; private String address = ""; private String cell = ""; public void Data(String n, String a, String c)< name = n; address = a; cell = c; >public void printData() < System.out.println("Name\tAddress\tContactNo"); System.out.println(name + "\t" + address + "\t" + cell); >>