public class AksesPrivat {
    public static void main(String[] args) {
        Buku buku = new Buku("Belajar Java", "BK-001", 80000.0);

        System.out.println("judul      : " + buku.judul);
        System.out.println("harga beli : " + buku.hargaBeli);
    }
}