Pemlan Array List

import java.text.*;
import java.util.*;

public class Solution{

    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        String pil;
        ArrayList<Mahasiswa> list = new ArrayList<>();
        do {

            Mahasiswa m1 = new Mahasiswa();
            System.out.print("Masukkan nama : ");
            String nama = in.nextLine();
            System.out.print("Masukkan alamat : ");
            String alamat = in.nextLine();
            System.out.print("Masukkan tanggal lahir (dd MM yyyy) : ");
            String tanggal = in.nextLine();
            System.out.print("Tambahkan data (y/n) : ");
            pil = in.nextLine();
            System.out.println("");

            SimpleDateFormat Format = new SimpleDateFormat("dd MM yyyy");
            Date tglLahir = Format.parse(tanggal);

            m1.setNama(nama);
            m1.setAlamat(alamat);
            m1.setTglLahir(tglLahir);
            list.add(m1);

        } while (pil.equalsIgnoreCase("y"));

        if (pil.equalsIgnoreCase("n")) {
            for (int i = 0; i < list.size(); i++) {
                list.get(i).output();
            }
        }

    }
}

public class Mahasiswa {
    String nama;
    String alamat;
    Date tglLahir;
    SimpleDateFormat Format2 = new SimpleDateFormat("dd-MM-yyyy");

    public Mahasiswa(){
    }
    public void setNama(String nama){
    this.nama=nama;
    }
    public void setAlamat(String alamat){
    this.alamat=alamat;
    }
    public void setTglLahir(Date tglLahir){
    this.tglLahir=tglLahir;
    }

    public void output(){
        System.out.println("Nama : "+nama);
        System.out.println("Alamat : "+alamat);
        System.out.println("Tanggal lahir : "+Format2.format(tglLahir));
        System.out.println("");
    }
}