This assignment will use the following description to implement a Dialog class for the Leap Year Problem. You need to decompose this problem into 2 classes:

1.The Date.java class. Implement a public class Date that represents a date composed of a month , day, and a year. Declare month, day, and year as integers. Date has a constructor with 3 parameters and 4 methods. Write the constructor Date which has 3 parameters: int d, int m, int y; and the 4 methods:

"daysIs()" which returns a day

"monthIs()" which returns a month

"yearIs()" which returns a year

"isLeapYear()" is needed in the class Date. It has one parameter year and returns a boolean. Write the method isLeapYear() knowing that a year is defined to be a leapyear it is a multiple of 4, and if it is is a multiple of 100, it must also be a multiple of 400. isLeapYear() thus decides when a year is a leap year. (see the discussion on "Hints for Assign5" to discover specific examples of a LeapYear).

2. The DateJDialog.java class: which implements the GUI. Please use the Dialog boxes developed in the book in chapter2 in pages 99-100 in the code-listing 2-32 (NamesDialog.java) for input and output.

Remember that you will prompt the user to enter:

1. a month;

2. a day;

3. a year

And out of these 3 you will be able to create a Date. Then you will use the dialog box to tell the user whether the year entered was a leapyear or not a leapyear.

The purpose of the Date.java that you will implement is to decide whether a year is a leap year. Here is a definition of when a year is considered a leap year :

1. year y1 is a leap year if it is multiple of 4.

2. year y1 is a leap year if it is a multiple of 100, it must be a multiple of 400.

3. Otherwise y1 is not a leap year.