public class Main_EmployeeTest
{
	public static void main(String[] args)
	{
		Employee harry;
		harry = new Employee("harry", 75000, 1987, 12, 15);
		Day d = harry.getHireDay(); //d and harry.hireDay refer to the same object
		d.advance(); //changes it to 1987-12-16 !!
		System.out.println(harry.getHireDay());
	}
}