急！希望老哥编写一下这个Java程序并提供代码

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。

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());
    }
}

如果对你有帮助的话，请采纳一下哈！

public static void main(String[] args) {
        Truck truck = new Truck();
        ComputeWeight television = new Television();
        ComputeWeight computer = new Computer();
        ComputeWeight washMachine1 = new WashMachine();
        ComputeWeight washMachine2 = new WashMachine();
        ComputeWeight washMachine3 = new WashMachine();
        ComputeWeight[] weights = new ComputeWeight[]{television, computer, washMachine1, washMachine2, washMachine3};
        truck.setWeights(weights);

        System.out.println("卡车内总重量为：" + truck.getWeights());
    }

    interface ComputeWeight {
        public double computeWeight();
    }

    static class Truck {
        ComputeWeight[] weights;

        public int getWeights() {
            int sum = 0;
            if (weights == null) {
                return sum;
            }
            for (ComputeWeight weight : weights) {
                sum += weight.computeWeight();
            }
            return sum;
        }

        public void setWeights(ComputeWeight[] weights) {
            this.weights = weights;
        }
    }

    static class Television implements ComputeWeight {
        @Override
        public double computeWeight() {
            return 1;
        }
    }

    static class Computer implements ComputeWeight {
        @Override
        public double computeWeight() {
            return 2;
        }
    }

    static class WashMachine implements ComputeWeight {
        @Override
        public double computeWeight() {
            return 3;
        }
    }

家庭作业要自己动手。