1. object HelloWorld {
2.    def main(args: Array[String]) {
3.       var day:DayInYear=null
4.       day = new DayInYear(10, 20)
5.       println(day)
6.    }
7.    
8.    class DateInYear(private var d: Int, private var m: Int) extends Exception {
9.         if (d < 1) d = 1
10.         if (d > 30) d = 30
11.         if (m < 1) m = 1
12.         if (m > 12) m = 12
13.        
14.         def day: Int = d
15.         def month: Int = m
16.  
17.         def setDay=(newDay: Int) {
18.             if (newDay < 1) throw new Exception ("wrong value")
19.             if (newDay > 30) throw new Exception ("wrong value")
20.             else d = newDay
21.         }
22.        
23.         def setMonth=(newMonth: Int) {
24.             if (newMonth < 1) throw new Exception ("wrong value")
25.             if (newMonth > 12) throw new Exception ("wrong value")
26.             else m = newMonth
27.         }
28.        
29.         override def toString = d + "." + m
30.     }
31.    
32.     object DateInYear {
33.         def apply(day: Int, month: Int) = new DateInYear(day, month)
34.     }
35. }