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ShoppingCart |
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1 // joi/1/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 1 11 */ 12 13 public class ShoppingCart 14 { 15 private int count; // number of Items in this ShoppingCart 16 private int cost; // cost of Items in this ShoppingCart 17 18 /** 19 * Construct a new empty ShoppingCart. 20 */ 21 22 public ShoppingCart() 23 { 24 count = 0; 25 cost = 0; 26 } 27 28 /** 29 * When this ShoppingCart is asked to add an Item to itself 30 * it updates its count field and then updates its cost 31 * field by sending the Item a getCost message. 32 * 33 * @param purchase the Item being added to this ShoppingCart. 34 */ 35 36 public void add( Item purchase ) 37 { 38 count++; // Java idiom for count = count + 1; 39 cost = cost + purchase.getCost(); 40 } 41 42 /** 43 * What happens when this ShoppingCart is asked how many 44 * Items it contains. 45 * 46 * @return the count of Items. 47 */ 48 49 public int getCount() 50 { 51 return count; 52 } 53 54 /** 55 * What happens when this ShoppingCart is asked the total 56 * cost of the Items it contains. 57 * 58 * @return the total cost. 59 */ 60 61 public int getCost() 62 { 63 return cost; 64 } 65 } 66
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ShoppingCart |
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