我的家庭工作任务有问题.我可以处理语法,但不能处理逻辑.你能给我一些提示吗？
我想要实现的是add方法会通过使用increaseAmount方法增加产品数量.现在,每次调用方法时,它都会将amount的值重置为"1".使这复杂化的原因是我不允许使用除已使用的任何其他私有变量.
private Map<String, Purchase> shoppingCart = new HashMap<String, Purchase>();
public void add (String product, int price) {
Purchase purchase = new Purchase (product, 1, price);
//the line abowe returns the value back to 1 which I don't want.
if(shoppingCart.containsKey(product)) {
shoppingCart.put(product, purchase);
purchase.increaseAmount();
}
else {
shoppingCart.put(product, purchase);
产品构造函数:
public Ostos(String product, int amount, int price) {
increaseAmount方法的代码:
private int amount;
public void increaseAmount() {
this.amount = (this.amount + 1);