Goal: Learn how to override the toString method.

Assignment: Implement a public Building class with:

private double data fields length, width, height;

a public constructor Building$($double length, double width, double height$)$;

a public overriding toString method that returns a text whose first line is the String returned by superclass Object toString method and whose second line is in the form:

length: length

width: width

height: heigth

with the actual values of the instance variables replacing the placeholders in bold.