Programming Forums - Problem Finding Difference Of 2 Longs

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- - Problem Finding Difference Of 2 Longs (http://www.programmingforums.org/showthread.php?t=1210)

T3FLoN

Nov 19th, 2004 4:20 PM

for skool they got me making a telephone witch is done and now my teacher added a phone bill to it...hes having us save the info of the number dialed time/date and duration of the call.

now im using the getTime() method witch returns the time in milliseconds since 1970 to now.
well i get both my longs witch are timeStart and timeEnd both get assigned a value as calls are made.
now i need to find the diferende of the 2 and store it in timeDuration witch is also a long.

my problem is that when i do this line.

durationTime = (timeEnd - timeStart);

its not giving me a correct answer just gives me timeEnd.
thats all the code ull need to give me a hand cause all else works as it should just not that equation.
BTW im Sys.out.printing them to see the values thats how i kno they are incorrect.
any insite would be appreciated.TX

Ooble

Nov 19th, 2004 4:27 PM

Can we see the rest of the code?

sykkn

Nov 19th, 2004 5:00 PM

If all of your values are indeed longs, then you should not be having a problem subtracting the two values.

import java.util.*;



class timetest {

    public static void main(String args[]) {

        long startStamp = new Date().getTime();



        try {

            Thread.sleep(500);

        } catch(Exception e) { }



        long endStamp = new Date().getTime();



        long diffStamp = (endStamp - startStamp);



        System.out.println("Start Stamp: " + startStamp);

        System.out.println("End Stamp: " + endStamp);

        System.out.println("Diff Stamp: " + diffStamp);

    }

}

jowings-pb:~/devel/java jowings$ java timetest

Start Stamp: 1100901620140

End Stamp: 1100901620640

Diff Stamp: 500

eccles

Nov 21st, 2004 7:51 PM

pay careful attention to Sykkn's example.

note that he is creating a new Date instance each time he wants to get the curent time...

ie he is NOT doing:

Date date = new Date();

long timeStart = date.getTime();

... 

long timeEnd = date.getTime();

long duration = timeEnd - timeStart;

which was my initial thought about what you might be doing, but if you are getting the end time instead of zero then perhaps you aren't.

but yeah - just look at that correct example and you might see where you went wrong.

oh - and if you don't know where you are going wrong with something - don't assume that all people with need to see is a single line of your code - one which clearly has nothing wrong with it :P

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