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Posted 14 February 2009 - 08:28 AM
How would i apply the append method to the Section highlighted (This Section).
Help would truly appreciated.
import java.util.*;
public class StockData {
private static class Item {
Item(String n, double p, int q) {
name = n;
price = p;
quantity = q;
}
// get methods
public String getName() { return name; }
public double getPrice() { return price; }
public int getQuantity() { return quantity; }
// instance variables
private String name;
private double price;
private int quantity;
}
private static Map<String, Item> stock = new HashMap<String, Item>();
static {
// if you want to have extra stock items, put them in here
// use the same style - keys should be 7 digit Strings
stock.put("0000000", new Item("Bath towel", 5.50, 10));
stock.put("1111111", new Item("Plebney light", 20.00, 5));
stock.put("2222222", new Item("Gorilla suit", 30.00, 7));
stock.put("3333333", new Item("Whizz games console", 50.00, 8));
stock.put("4444444", new Item("Oven", 200.00, 4));
}
public static String getName(String key) {
Item item = stock.get(key);
if (item == null) return null; // null means no such item
else return item.getName();
}
public static double getPrice(String key) {
Item item = stock.get(key);
if (item == null) return -1.0; // negative price means no such item
else return item.getPrice();
}
public static int getQuantity(String key) {
Item item = stock.get(key);
if (item == null) return -1; // negative quantity means no such item
else return item.getQuantity();
}
//This section :^:
// update stock levels
// extra is +ve if adding stock
// extra is -ve if selling stock
public static void update(String key, int extra) {//was int extra
Item item = stock.get(key);
if (item != null) item.quantity += extra;//was int extra
//This Section :^:
}
public static void close() {
// Does nothing for this static version.
// Write a statement to close the database when you are using one
}
}
Thank u
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