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ShoppingCart |
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1 // joi/4/estore/ShoppingCart.java 2 // 3 // 4 // Copyright 2003 Bill Campbell and Ethan Bolker 5 6 /** 7 * A ShoppingCart keeps track of a customer's purchases. 8 * 9 * @see EStore 10 * @version 4 11 */ 12 13 public class ShoppingCart 14 { 15 /// replace these two fields by a single ArrayList 16 private int count; // number of Items in this ShoppingCart 17 private int cost; // total cost of Items in this ShoppingCart 18 19 /** 20 * Construct a new empty ShoppingCart. 21 */ 22 23 public ShoppingCart() 24 { 25 count = 0; 26 cost = 0; 27 } 28 29 /** 30 * Add an Item to this ShoppingCart. 31 * 32 * @param item the Item to add. 33 */ 34 35 public void addItem( Item item ) 36 { 37 /// this code just keeps track of the totals 38 /// replace it with code that adds the item to the list 39 count++; 40 this.cost += item.getCost(); // Java idiom: a += b means a = a + b 41 } 42 43 /** 44 * Return an Item from this ShoppingCart. 45 * 46 * @param item the Item to return. 47 */ 48 49 public void returnItem( Item item ) 50 { 51 /// look through the list looking for Item 52 /// remove it if it's there 53 } 54 55 /** 56 * What happens when this ShoppingCart is asked how many 57 * Items it contains. 58 * 59 * @return the number of items in this ShoppingCart. 60 */ 61 62 public int getCount() 63 { 64 /// get this information from the list, 65 /// since the count field no longer exists 66 return count; 67 } 68 69 /** 70 * What happens when this ShoppingCart is asked the total 71 * cost of the Items it contains. 72 * 73 * @return the total cost of the items in this ShoppingCart. 74 */ 75 public int getCost() 76 { 77 /// get this information from the list, 78 /// since the cost field no longer exists 79 return cost; 80 } 81 82 /** 83 * Write the contents of this ShoppingCart to a Terminal. 84 * 85 * @param t the Terminal to use for output. 86 */ 87 88 public void showContents( Terminal t) 89 { 90 /// work to do here ... 91 t.println(" [sorry, can't yet print ShoppingCart contents]"); 92 } 93 } 94
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ShoppingCart |
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