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Starting out with Java: From control structures through objects
Chapter 6
Programming Challenges

9. Days in a Month 

Write a class named MonthDays. The class’s constructor should accept two arguments: 

•  An integer for the month (1 = January, 2 = February, etc.). 
•  An integer for the year 

The class should have a method named getNumberOfDays that returns the number of days in the specified month. The method should use the following criteria to identify leap years: 

1.  Determine whether the year is divisible by 100. If it is, then it is a leap year if and if only it is divisible by 400. For example, 2000 is a leap year but 2100 is not.
2.  If the year is not divisible by 100, then it is a leap year if and if only it is divisible by 4. For example, 2008 is a leap year but 2009 is not. 

Demonstrate the class in a program that asks the user to enter the month (letting the user enter an integer in the range of 1 through 12) and the year. The program should then display the number of days in that month. Here is a sample run of the program: 

Enter a month (1-12): 2 [enter] 
Enter a year: 2008 [enter] 

29 days

Gaddis, Tony (2015-05-29). Starting Out with Java: From Control Structures through Objects (Page 399). Pearson Education. Kindle Edition.

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