Programming Forums > Application Development > Java

T3FLoN · Nov 19th, 2004, 3:20 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.

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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, 3:27 PM

Can we see the rest of the code?

sykkn · Nov 19th, 2004, 4:00 PM

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

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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);
    }
}

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jowings-pb:~/devel/java jowings$ java timetest
Start Stamp: 1100901620140
End Stamp: 1100901620640
Diff Stamp: 500

eccles · Nov 21st, 2004, 6:51 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:

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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

Nov 19th, 2004, 3:20 PM	#1
T3FLoN Newbie Join Date: Nov 2004 Posts: 21 Rep Power: 0	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. (Toggle Plain Text) durationTime = (timeEnd - timeStart); 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 __________________ <span style='font-family:Courier'><span style='font-size:12pt;line-height:100%'><span style='color:orange'>☼☼☼ Just kill em all, and let God sort em out. ☼☼☼</span></span></span>

Nov 19th, 2004, 3:27 PM	#2
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Can we see the rest of the code? __________________ Me :: You :: Them

Nov 19th, 2004, 4:00 PM	#3
sykkn Hobbyist Programmer Join Date: Apr 2004 Location: Texas Posts: 106 Rep Power: 5	If all of your values are indeed longs, then you should not be having a problem subtracting the two values. (Toggle Plain Text) 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); } } 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); } } (Toggle Plain Text) jowings-pb:~/devel/java jowings$ java timetest Start Stamp: 1100901620140 End Stamp: 1100901620640 Diff Stamp: 500 jowings-pb:~/devel/java jowings$ java timetest Start Stamp: 1100901620140 End Stamp: 1100901620640 Diff Stamp: 500 __________________ [ [ SykkN alloc ] initWithThePowerTo: destroyYouAll ]; /* Don't make me use it! */

Nov 21st, 2004, 6:51 PM	#4
eccles Newbie Join Date: Nov 2004 Posts: 16 Rep Power: 0	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: (Toggle Plain Text) Date date = new Date(); long timeStart = date.getTime(); ... long timeEnd = date.getTime(); long duration = timeEnd - timeStart; 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

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Programming Forums > Application Development > Java

Problem Finding Difference Of 2 Longs