Java

OOP GUIDE / WORK

DATE CLASS

Topics

• Advanced class design
• Constructors
• Instance methods
• Encapsulation

TASK – PART 1 – DATE CLASS: INSTANCE VARIABLES

INCOMPLETE

Include the following methods inside the class:

- isLeapYear() – true if the year is a leap year

Note: A leap year is a year that is divisible by 4, but not divisible by 100, unless it is divisible also by 400.

Examples: The years 1204, 1720 and 2000 are leap years. The years 2022 and 1900 are not leap years.

- setNextDay() – moves the date to the next day (ie: Jan 2, 1972 becomes Jan 3, 1972)

- getNextYear() – returns the number of the next year

- getNextDay() – returns the number of the next day

- nextMonth() – returns the number of the next month

- toString() – returns a date in the form of January 3^rd, 1972

- maybe: calculate weekday? Ie: Monday

- isBefore(Date d) – returns true of the date is before Date d

- isAfter(Date d) - …

Consider using something like this for Date’s constructor:

public class Person
{
  int age;
  public Person(int age) throws IllegalArgumentException
 {
  if(age <= 0)
 {
 
  throw new IllegalArgumentException("Age is not allowed");
 }
  // Do some stuffs
  this.age = age;
 }
}