Java How to Program, Early Objects, 11th Edition

... out-of-range for the specified month and year");
25         }
26
27         // check for leap year if month is 2 and day is 29
28         if (month == 2 && day == 29 && !(year % 400 == 0 ||
29               (year % 4 == 0 && year % 100 != 0))) {
30            throw new IllegalArgumentException("day (" + day +
31               ") out-of-range for the specified month and year");
32         }
33
34         this.month = month;
35         this.day = day;
36         this.year = year;
37
38         System.out.printf("Date object constructor for date %s%n", this);
39      }
40
41      // return a String of the form month/day/year
42      public String toString() {
43         return String.format("%d/%d/%d", month, day, year);
44      }
45   }

Date class declaration.

Class Employee

Class Employee (Fig. 8.8) has reference-type instance variables firstName (String), last-Name (String), birthDate ...