Practice Problems: Classes and Objects (Chapters 5 and 6)

1) The Java class called Holidayis started below. An object of class Holidayrepresents a holiday during the year. This class has three instance variables:

? name,whichisaStringrepresentingthenameoftheholiday

? day,whichisanintrepresentingthedayofthemonthoftheholiday ? month,whichisaStringrepresentingthemonththeholidayisin

public class Holiday { private String name;

private int day; private String month;

// your code goes here }

a) Write a constructor for the class Holiday, which takes a Stringrepresenting the name, an intrepresenting the day, and a Stringrepresenting the month as its arguments, and sets the class variables to these values.

b) Write a method inSameMonth, which compares two instances of the class Holiday,and returns the Boolean value trueif they have the same month, and falseif they do not.

c) Write a method avgDatewhich takes an array of base type Holidayas its argument, and returnsadoublethat istheaverageofthedayvariablesintheHolidayinstancesinthe array. You may assume that the array is full (i.e. does not have any null entries).

d) Write a piece of code that creates a Holidayinstance with the name Independence Day, with the day 4, and with the month July.

2) The class Movie is started below. An instance of class Movie represents a film. This class has the following three class variables:

? title,whichisaStringrepresentingthetitleofthemovie

? studio,whichisaStringrepresentingthestudiothatmadethemovie

? rating,whichisaStringrepresentingtheratingofthemovie(i.e.PG13,R,etc)

public class Movie { private String title; private String studio; private String rating;

// your code goes here }