I am also still very much a learner, and so appreciate that it's not easy asking questions when you aren't even totally sure what you're asking about.
Based on your challenging description I have tried to write a example program that you can build upon. Please read my comments as i have tried to be very descriptive to help you understand/learn.
public class Order {
//Constructor 2
public Order(String productName, int quantity) {
this.productName = productName;//Get the name
this.quantity = testQuantity(quantity); //Get the total quantity
this.orderPrice =getPrice(productName, quantity); //Get the price of the order
this.discountPrice = 0; //Should be set to a value, even though it won't be used in this constructor
orderNum++; //Another order in, up the count :)
displayOrder(productName, quantity, this.orderPrice, this.discountPrice); //Show order details
}
//Constructor 3
public Order(String productName, int quantity, int discount) {
this.productName = productName; //Get the name
this.quantity = testQuantity(quantity); //Get the total quantity
this.orderPrice = getPrice(productName, quantity); //Get the price of the order
this.discountPrice = testDiscount(discount, this.orderPrice); //Get the price if there is a discount
orderNum++; //Another order in, up the count :)
displayOrder(productName, quantity, this.orderPrice, this.discountPrice); //Show order details
}
I have added some extra fields at the bottom of the class to make my example easier to show, and because I was very unsure as to how you want some of your methods to work. I have placed and initialized these in your constructors, and commented as to why.
private void displayOrder(String productName, int quantity, int orderPrice, int discountPrice){
if(discountPrice == 0){ //If the discount is 0 then there is no discount so the discount price is the same as the order price
discountPrice = orderPrice;
}
// \n is called an escape character and when in a string creates a new line.
System.out.println("You have ordered: " + quantity + " " + productName + ("(s)") //Number and name of item ordered
+ "\nTotal cost: £" + orderPrice + "\nPrice with Discount (If applicable)= £" + discountPrice //Order price and discount price displayed
+ "\nOrder number: " + orderNum +"\n"); //Order Number
}
The above method displays all the details of the order created by either constructor and displays it's details to see.
private int testQuantity(int q){
//What you want to do in this method,
//For example
//System.out.println("You have ordered " + q + "Items");
return q;
}
I am unsure what you want to do with this method and so have left it blank. If you need to store a total number of available items to check the quantity against the best way would be a database, which takes a whole different set of learning.
private int testDiscount(int discount, int orderPrice){ //Will return a discounted price and store it in 'discountPrice' field
int reducedPrice = (orderPrice - discount);
return reducedPrice;
}
Returns a discounted price if the user has a discount in addition to the total order price. Both are held by the Order object which you create with the constructor
private int getPrice(String productname, int quantity){
int price = 0;
switch(productName){ //Switch so you can find what item ordered and allocate the correct price
//Add cases for different items?
case "Sweater":
price = 10;
break;
default:
price = 0;
break;
}
int totalPrice = price * quantity; //Work out price by multiplying quantity of item by price determined by switch
return totalPrice;
}
The above switch could possibly be the best way to check the price for items. Each case holds the name of an item and a price for it. You use that price multiplied by the quantity to create the order price.
private String productName; //Name of product
private int quantity; //Quantity ordered
private int orderPrice; // The total order of the price
private int discountPrice; //Somewhere to store the price of an order with a discount
private static int orderNum; //This is static so that you it can be referenced even if no orders have been made
public static void main(String[] args){ //Test the ordering
Order order1 = new Order("Sweater", 2);
Order order2 = new Order("Sweater", 2, 5);
}
Create two orders from a 'main' method to test our application.
Have a tinker and play with it. I am unsure if this was what you wanted from your question but hopefully you find this helpful either way.
