Consider the following class definition, written by a novice programmer, that represents a specific working day in a 12-week project period.

public class DayAndWeek {

public int day; // Day of the Week, Varies from 1-5

public int week; // Week of the Project, Varies from 1-12

};

a) (5p) Provide a code fragment showing a redesigned DayAndWeek class that more appropriately encapsulates the two instance variables day and week.

b) (5p) Provide methods that will enable the two instance variables to be queried and changed .

c) (10p) Incorporate an error-checking routine into your instance variable change methods that prevent data items from assuming invalid values.

d) (5p) Provide a method that will ensure the instance variables day and week will be initialised to default values (1,1) immediately upon creation of a new instance of the class.

ATTENTION: The language is JAVA