Java messing around, Java

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// Start with Box.
class Box {
    private double width;
    private double height;
    private double depth;
    
    // Construct clone of an object
    Box(Box ob) { //pass object to constructor 
        width = ob.width;
        height = ob.height;
        depth =  ob.depth;
    }
    
    // constructor used when all dimensions specified
    Box(double w, double h, double d) { 
        width = w;
        height = h;
        depth = d;
    }
    
   // constructor used when no dimensions specified 
    Box() {
        width = -1; // use -1 to indicate
        height = -1; // an uninitialized
        depth = -1; // box
    }
    
    // constructor used when cube is created 
    Box(double len) {
        width = height = depth = len;
    }
    
    // compute and return volume
    double volume() {
        return width * height * depth;
    }
}

// Add weight
class BoxWeight extends Box {
    double weight; // weight of box
    
    
    // construct clone of an object
    BoxWeight(

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