the following provides details on the building class. instance variables all instance variables must be specified as private instance variables. constructor the constructor should accept four parameters: 1) the length of the building, 2) the width of the building, 3) the length of the building's lot, and 4) the width of the building's lot. the constructor parameters should be used to initialize the length, width, lotlength, and lotwidth instance variables, respectively. you may assume the values passed will be valid values for the purposes of the fields.