5-7习题答案

13请分析POS机系统中各个类的属性和操作。

class Sale {

private List lineItems = new ArrayList(); private Date date = new Date(); private boolean isComplete = false; private Payment payment;

}

class SalesLineItem { private int quantity;

private ProductSpecification specification; }

class Payment {

Money amount; }

14 请给出ATM机系统的状态图。

16请给出短信系统的状态图。