急！希望老哥编写一下这个Java程序并提供代码

Question

编写一个Java应用程序，货车要装载一批货物，货物由三种商品组成：电视、计算机和洗衣机。卡车需要计算出整批货物的重量。要求有一个ComputeWeight接口，该接口中有一个方法：public double computeWeight();有三个实现该接口的类：Television、Computer和WashMachine,分别重写computeWeight()方法给出自己的重量；有一个Truck类，该类用ComputeWeight接口类型的数组作为成员（Truck类面向接口），那么该数组的单元就可以存放Television对象的引用、Computer对象的引用或WashMachine对象的引用。程序能输出Truck对象所装载的货物的总重量。

Answer 1

public interface ComputeWeight {
    double computeWeight();
}

public class Television implements ComputeWeight {
    @Override
    public double computeWeight() {
        return 10;
    }
}

public class Computer implements ComputeWeight{
    @Override
    public double computeWeight() {
        return 20.5;
    }
}

public class WashMachine implements ComputeWeight{
    @Override
    public double computeWeight() {
        return 50.5;
    }
}

public class Truck {
    public ComputeWeight[] array = new ComputeWeight[3];

    public double cal(){
        double sum = 0;
        for (int i = 0; i < this.array.length; i++){
            sum += this.array[i].computeWeight();
        }
        return sum;
    }
}

public class TestMain {
    public static void main(String[] args) {
        Television television = new Television();
        Computer computer = new Computer();
        WashMachine washMachine = new WashMachine();

        Truck truck = new Truck();
        truck.array[0] = television;
        truck.array[1] = computer;
        truck.array[2] = washMachine;

        System.out.println("Truck对象所装载的货物的总重量: " + truck.cal());
    }
}

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