object HelloWorld {
   def main(args: Array[String]) {
      var day:DayInYear=null
      day = new DayInYear(10, 20)
      println(day)
   }
   
   class DateInYear(private var d: Int, private var m: Int) extends Exception {
        if (d < 1) d = 1
        if (d > 30) d = 30
        if (m < 1) m = 1
        if (m > 12) m = 12
        
        def day: Int = d
        def month: Int = m

        def setDay=(newDay: Int) {
            if (newDay < 1) throw new Exception ("wrong value")
            if (newDay > 30) throw new Exception ("wrong value")
            else d = newDay
        }
        
        def setMonth=(newMonth: Int) {
            if (newMonth < 1) throw new Exception ("wrong value")
            if (newMonth > 12) throw new Exception ("wrong value")
            else m = newMonth
        }
        
        override def toString = d + "." + m
    }
    
    object DateInYear {
        def apply(day: Int, month: Int) = new DateInYear(day, month)
    }
}