how Passing variable from Controller to class

h have this code i want connect "account_num" to class how i can do it?

this is controlling class

public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        Bank1 ob1 = new Bank1();
    Bank2 ob2= new Bank2();
    ob1.accountname();
    ob2.blance();
    ob2.withdraw();
    ob2.deposit();
    
    System.out.println("****************************"+"/n BANK AL-KHUWAIR"+
            "/n****************************");
    System.out.print("Enter your Bank Account Number : ");
    int account_num = sc.nextInt();
    System.out.println("Welcome to "+ob1.account_num);
            

this is class

package B1;


public class Bank1 {

    //im not sure
    public void accountname(int account_num)
    {
        if (account_num == 100)
        {
            System.out.println("Dr.Shabber Shaikh");
        }
        else if (account_num == 101)
        {
             System.out.println("Mr.hitesh");
        }
        else if (account_num == 102 )
        {
             System.out.println("Mr.Hari");

please help me and thanks