Thread: Please help me with the java code bluej

Create a program that will run a simple computation on ANY business logic.
e.g. Restaurant Billing System
Offer a Menu
1. Burger 10.00
2. Drinks 5.00
3. Fries 1.50
4. Pizza 7.50
5. Ice Cream 4.00
6. Chicken 15.00
Ask for the number of ordered items.
Compute for the Total Bill.
Display the List of Items Ordered, as well as, Total Bill.
Other possible concepts: Ordering System, Rental System, Reservation System etc.
2. Computation should be placed in a function procedure.

My problem is how is the computation in the end of the code


package fastfood;
import java.util.*;
public class FastFood {
public static void main(String[] args) {
Scanner keyboard=new Scanner(System.in);
double[] price={1.75,1.50,0.90,1.25,3.00,3.50,2.00,1.75};
String[] food={"hotdog","fries","soda","cookie","pizza","bu rger",
"taco","shake"};
int selection=instructions();
switch(selection) {
case 1: printMenu(price,food); break;
case 3: break;
default: System.out.println("That is not a valid choice");
}
}
public static int instructions() {
Scanner keyboard=new Scanner(System.in);
System.out.println("Automatted Fast Food");
System.out.println("For the menu, press 1");
System.out.println("To place an order, press 2");
System.out.println("To place an order, press 3");
int choice=keyboard.nextInt();
return choice;
}
public static void printMenu(double[] cost, String[] items) {

}
}
}

hello! may i ask how did you do your code ?? im confuse and we have given the same task also and im lost