plaintextsalesformatter.java

CMU Java课程设计

import java.util.*;
class PlainTextSalesFormatter implements SalesFormatter{
	private static PlainTextSalesFormatter singletonInstance=null;
	static public PlainTextSalesFormatter getSingletonInstance()
	// Static method that obtains the single instance of class PlainTextsalesFormatter. 
	{


        if (singletonInstance == null) {

            singletonInstance = new PlainTextSalesFormatter();

        }
        return singletonInstance;

	}
	private PlainTextSalesFormatter()
	// Constructor that is declared private so it is inaccessible to other classes. A private constructor makes it impossible for any other class to create an instance of class PlainTextSalesFormatter. 
	{
		
	}
	public String formatSales(Sales sales)
	// Produces a string that contains the specified sales information in a plain-text format. 
	{
		int numOrders = sales.getNumberOfOrders();
		String out = "" ;
		if (numOrders != 0) {
			int orderNumber = 1;
			for (Iterator i = sales.getOrdersIterator();i.hasNext();) {
			Order order = (Order) i.next();
			out+="Order"+orderNumber+"\n";
			orderNumber++;
			for (Iterator j= order.getItemsIterator();j.hasNext();){
				OrderItem item=(OrderItem) j.next();
				 out +=item.getQuantity()+" ";
				 out +=item.getProduct().getCode()+" ";
				 out +=item.getProduct().getPrice()+" \n";
				 }
			out+="\nTotal ="+order.getTotalCost()+"\n";
			}
		}
		else
			{
			System.out.println("Sorry~There is no sales");
			}
        return out;

    }


}