编写货箱类Cargo名字name属性货物重量weighe吨价格price万元吨保质期warranty天编写构造方法 CargoString name double weight double price int warra nty编写价格计算方法double getPriceint n如果n不大于保质期则返回货物价格反之返回0编写一个火车类Train其成员包含4节货箱补全相关代码使得nain方法可

public class Cargo { private String name; private double weight; private double price; private int warranty;

public Cargo(String name, double weight, double price, int warranty) {
    this.name = name;
    this.weight = weight;
    this.price = price;
    this.warranty = warranty;
}

public double getPrice(int n) {
    if (n <= warranty) {
        return weight * price;
    } else {
        return 0;
    }
}

public String getName() {
    return name;
}

public double getWeight() {
    return weight;
}

public double getPrice() {
    return price;
}

public int getWarranty() {
    return warranty;
}

}

public class Train { private Cargo c1; private Cargo c2; private Cargo c3; private Cargo c4;

public Train(Cargo c1, Cargo c2, Cargo c3, Cargo c4) {
    this.c1 = c1;
    this.c2 = c2;
    this.c3 = c3;
    this.c4 = c4;
}

public double totalWeight() {
    return c1.getWeight() + c2.getWeight() + c3.getWeight() + c4.getWeight();
}

public double originalPrice() {
    return c1.getPrice() + c2.getPrice() + c3.getPrice() + c4.getPrice();
}

public double lossPrice(int n) {
    double loss = 0;
    if (c1.getWarranty() < n) {
        loss += c1.getPrice(n - c1.getWarranty());
    }
    if (c2.getWarranty() < n) {
        loss += c2.getPrice(n - c2.getWarranty());
    }
    if (c3.getWarranty() < n) {
        loss += c3.getPrice(n - c3.getWarranty());
    }
    if (c4.getWarranty() < n) {
        loss += c4.getPrice(n - c4.getWarranty());
    }
    return loss;
}

}

public class Progl { public static void main(String[] args) { Train t = new Train(new Cargo("鱼肉", 150, 8, 7), new Cargo("白菜", 100, 1.1, 10), new Cargo("荔枝", 100, 10, 3), new Cargo("大米", 200, 2, 180)); System.out.println("货物总重量：" + t.totalWeight() + "吨"); System.out.println("出发时货物总价格：" + t.originalPrice() + "万元"); System.out.println("发出5天后，损失货物价格：" + t.lossPrice(5) + "万元"); System.out.println("发出10天后，损失货物价格：" + t.lossPrice(10) + "万元"); }