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package org.midea.mall;

import java.util.Date;

import java.util.Calendar;

public class OrderSystem {

public static final String DEFAULT_ORDER_PREFIX = "ORD-";

private String orderId;

public OrderSystem() {

this.orderId = generateOrderId();

......

totalOrderCount++;

}

public double calculateTotal(double freight) {

return this.amount + freight;

}

public static String generateOrderId() {

Calendar cal = Calendar.getInstance();

.......

return DEFAULT_ORDER_PREFIX + year +

String.format("%02d", month) +

String.format("%02d", day) +

"-" + (totalOrderCount + 1);

}

// 静态函数：获取当前系统时间

public static Date getCurrentDate() {

return new Date();

}

// 实例函数：拼接订单信息

public String getOrderInfo() {

return "订单ID：" + orderId +

"\n订单金额：¥" + amount +

"\n创建时间：" + createTime +

"\n订单状态：" + status.getDescription();

}

// Getter/Setter（访问实例变量的函数）

public String getOrderId() {

return orderId;

}

public double getAmount() {

return amount;

}

public void setAmount(double amount) {

this.amount = amount;

}

public Date getCreateTime() {

return createTime;

}

public OrderStatus getStatus() {

return status;

}

public void setStatus(OrderStatus status) {

this.status = status;

}

}