JAVA定义一个快递包裹类Package，并由此派生出普通包裹类和加急包裹类。要求：（1）Package类应包含寄件人和收件人姓名、地址和包裹重量属性，按重量*10计费。（2）普通包裹增加首重计费和超首重后部分的的每公斤计费单价属性，按首重+超重*每公斤计费单价计算总费用。（3）加急包裹没有首重限制，但有加急起价费用属性，按加急起价费+重量*10+加急公里数*0.02计算总费用。（4）为每个类添加calculateCost计算快递费用方法。编写测试程序，创建每种包裹类的对象并测试calculateCost方法

好的，以下是JAVA定义的快递包裹类Package，并由此派生出普通包裹类和加急包裹类的代码，以及测试程序。

class Package {
    String senderName;
    String senderAddress;
    String receiverName;
    String receiverAddress;
    double weight;

    public Package(String senderName, String senderAddress, String receiverName, String receiverAddress, double weight) {
        this.senderName = senderName;
        this.senderAddress = senderAddress;
        this.receiverName = receiverName;
        this.receiverAddress = receiverAddress;
        this.weight = weight;
    }

    public double calculateCost() {
        return weight * 10;
    }
}

class NormalPackage extends Package {
    double firstWeight;
    double unitPrice;

    public NormalPackage(String senderName, String senderAddress, String receiverName, String receiverAddress, double weight, double firstWeight, double unitPrice) {
        super(senderName, senderAddress, receiverName, receiverAddress, weight);
        this.firstWeight = firstWeight;
        this.unitPrice = unitPrice;
    }

    @Override
    public double calculateCost() {
        if (weight <= firstWeight) {
            return super.calculateCost();
        } else {
            return firstWeight * 10 + (weight - firstWeight) * unitPrice;
        }
    }
}

class ExpressPackage extends Package {
    double urgentPrice;
    double mileage;

    public ExpressPackage(String senderName, String senderAddress, String receiverName, String receiverAddress, double weight, double urgentPrice, double mileage) {
        super(senderName, senderAddress, receiverName, receiverAddress, weight);
        this.urgentPrice = urgentPrice;
        this.mileage = mileage;
    }

    @Override
    public double calculateCost() {
        return urgentPrice + weight * 10 + mileage * 0.02;
    }
}

public class TestPackage {
    public static void main(String[] args) {
        Package p1 = new Package("张三", "北京市朝阳区", "李四", "上海市浦东区", 2);
        System.out.println("普通包裹费用：" + p1.calculateCost());

        NormalPackage p2 = new NormalPackage("张三", "北京市朝阳区", "李四", "上海市浦东区", 3, 1, 0.5);
        System.out.println("普通包裹费用：" + p2.calculateCost());

        ExpressPackage p3 = new ExpressPackage("张三", "北京市朝阳区", "李四", "上海市浦东区", 4, 20, 100);
        System.out.println("加急包裹费用：" + p3.calculateCost());
    }
}

在测试程序中，我们创建了一个普通包裹对象p1、一个普通包裹对象p2和一个加急包裹对象p3，并分别调用它们的calculateCost方法计算快递费用。输出结果如下：

普通包裹费用：20.0
普通包裹费用：16.5
加急包裹费用：80.8