1. Which type?

 /** A generic building */
    public class Building {
      double  floorSpace;      //total floor space in square feet
      int     floorCount;      //number of floors
      String  address;         //address of the building
      String  owner;           //owner of the building
      boolean ownerOccupied;   //is the owner an occupant of the building?
      int     phoneLineCount;  //number of connected telephone lines
    }

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2. Java API

a. API stands for Application Programming Interface.
	(i) 	It is a list of avaliable java classes organized according to packages.
	(ii)	For each class, it lists the instance methods, static methods, as well 
        	as instance and static variables avaliable to the programmer.
   	(iii)	A brief description of the expected functionality of each class and the 
	        methods it contains is included.

b. the two fields are E and PI. 
c. System.currentTimeMillis()
d. the method trim Returns a copy of the string, with leading and trailing whitespace omitted.
e. the pattern character 0 means Digit and # means Digit, zero shows as absent.
f. four constructors.
g. an integer from 0 to 11 is used for representing a month.