// Display method
    public String dimensions(){
        // Return a string that contains the 3 dimensions of the object
        return "Depth =" + depth + "\n" +
                "Length = " + length + "\n" +
                "Width = " + width + "\n" +
                "Floor area = " + this.area() + "\n" +
                "Volume = " + this.volumn();
    }   // End of method
}   // End of class