@Override
public void Xuat() {
super.Xuat();
System.out.print("So san pham: " + this.soSanPham);
System.out.print("So tien mot san pham: " + this.soTienMotSanPham);
System.out.print("LUONG: " + this.TinhLuong());
}
// Xu ly nghiep vu
@Override
public void Nhap() {
super.Nhap();
Scanner scan = new Scanner(System.in);
System.out.print("Nhap so san pham: ");
this.soSanPham = Integer.parseInt(scan.nextLine());
System.out.print("Nhap so tien mot san pham: ");
this.soTienMotSanPham = Integer.parseInt(scan.nextLine());
}