Java project

Customer::

public class Customer {
private String custID;
private String name;
private String cell;



public Customer(String custID, String name, String cell) {
    this.custID = custID;
    this.name = name;
    this.cell = cell;
}



public void display()             {
    System.out.println(custID + " "+ name +"  " +cell);
}

}


Item::

public class Item {
    private String ItemID;
private String name;
private  double price;;

public Item (String ItemID,String Name,double price) {
    this.ItemID=ItemID;
            this.name=name;
    this.price=price;
}
public void display()  {
    System.out.println(ItemID + "  " + price);
}
}
Buy::

public class Buy {
    private Customer  c;
    private Item i;
    private String date;
    private double quantity;
    public Buy(Customer c,Item i,String date,double quantity) {
        this.c=c;
        this.i=i;
        this.date =date;
        this.quantity =quantity;
    }
    public void display() {
        c.display();
        i.display();
        System.out.println(date + " "+quantity);
    }

    public static void main(String[] args) {
        Customer customer = new Customer ("394", "Bristy", "01930400");
        Item item = new Item("001", "OOP",250);
        Buy buy =new Buy (customer,item,"02-05-19", 230);
        buy.display();

    }

}