Another thing about java...

[xospec1alk]

i have this function
public foo{
public static footype foofunction throws fooexception(...)
}

so im calling foofunction which is supposed to return footype

return foo.foofunction()

but i keep getting an unhandled exception type footype

i put the return in a try catch, but when i catch exception fooexception, what do i put in the body, cause its saying that this function needs to return a footype...

 

[Descartes]

Please post the full source. What you have here isn't even valid syntax...

Show the interface, the full class, etc..

 

[xospec1alk]

alrite alrite....
here is the interface

package timeman.calendar;
ublic interface TimeDuration extends Comparable {
public TimeDuration add(TimeDuration otherTime);
public int getHours();
public int getMinutes();
public int getSeconds();
public int toSeconds();
public TimeDuration subtract(TimeDuration otherTime) throws InvalidTimeOperationException;
public String persistentString();
}

here is the function
final class SimpleTimeDuration implements TimeDuration, Serializable {
public static TimeDuration computeDuration
(TimeOfDay startTime, TimeOfDay endTime)
throws InvalidTimeOperationException {
if (startTime.compareTo(endTime) > 0) {
throw new InvalidTimeOperationException("Cannot compute duration between " +
startTime + " and " + endTime +
", because the start time must be before the end time");
}

TimeDuration timeToStart = new SimpleTimeDuration(startTime);
TimeDuration timeToEnd = new SimpleTimeDuration(endTime);
return timeToEnd.subtract(timeToStart);
}

}

its not the complete class but thats the function i need to access...

InvalidTimeOperationException is given i dont think u need the source for that...

so here, when i try to do

public TimeDuration getDuration(){
SimpleTimeDuration.computeDuration(startTime, endTime) //i get an exception not handled
}// this function is in a whole different class but in the package timeman.calendar

 

[PCHPlayer]

Since you do not know what to return in the catch section just declare that the function that calls foofunction also throws fooexception. Now you have passed the buck one level up. That's the beauty of exceptions, you can unwind an error all the way to main if no one knows how to recover from the anomaly.

 

[xospec1alk]

ok in the function

TimeDuration getDuration(){
return SimpleTimeDuration.computeDuration(startTime, endtime);
}

so where exactly am i putting the try/catch?

try{
return SimpleTimeDuration.computeDuration(startTime, endTime);
}catch(InvalidTimeOperationException e) {
// i need to return something of type TimeDuration...but what?
}

 

[michaelh20]

For fun you can always return null, and check it up the ladder. Of course this defeats the purpose of exceptions.

 

[xospec1alk]

returning null works of course.....but i need something better.