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object timeofday {
class DateError extends Exception
/** Simulating properties in Scala
* (example 4.2.1 in the Scala Language Specification)
*/
class TimeOfDayVar {
private var h, m, s: Int = 0
def hours = h
/** A method 'ident_=' is a setter for 'ident'. 'code.ident = ...' will
* be translated to a call to 'ident_='
*/
def hours_= (h: Int) =
if (0 <= h && h < 24) this.h = h
else throw new DateError()
def minutes = m
def minutes_= (m: Int) =
if (0 <= m && m < 60) this.m = m
else throw new DateError()
def seconds = s
def seconds_= (s: Int) =
if (0 <= s && s < 60) this./*!*/s = s
else throw new DateError()
}
def main(args: Array[String]) {
val d = new TimeOfDayVar
d.hours = 8; d./*!*/minutes = 30; d.seconds = 0
d.hours/*#*/ = 25 // throws a DateError exception
}
}
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