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Thread: Calculating time taken - does this look right? Error!

  1. #1
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    Default Calculating time taken - does this look right? Error!

    /**
    * Method works out time taken to perform an algorithm
    *
    *
    */
    public static void timeTaken() {

    long startTime = System.currentTimeMillis();
    long time = 0;

    for(int i = 0; i < 1000; i++) {
    time += i;
    }

    long endTime = System.currentTimeMillis();
    System.out.println(endTime - startTime); //prints time taken
    }
    This is what the method I have written looks like.
    The error I get is 'void' type not allowed here, which I researched and learnt that: I am using a method that does not return a value in a place where a value is required such as the right side of an equal sign or a parameter to another method.

    The thing is, I don't see exactly where that applies in my code!
    Please help me!

    Thank you for your time and knowledge.


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: Calculating time taken - does this look right? Error!

    You method is fine. How are you calling it?

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    Default Re: Calculating time taken - does this look right? Error!

    Quote Originally Posted by PhHein View Post
    You method is fine. How are you calling it?
    I'm calling it from my main method, and I would really like to call it using System.err.println()

    At the moment, I can see that System.err.println(timeTaken()) means that I'll have to change something in the timeTaken method - what and how should I alter it?

    Thank you so much for your reply!

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    Senior Member PhHein's Avatar
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    Default Re: Calculating time taken - does this look right? Error!


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    Default Re: Calculating time taken - does this look right? Error!

    hi

    You need to have the method defined as public static long timeTaken() and return a long variable say message. where message = endTime - startTime.
    And in the main method you need to call System.err.println(timeTaken()); and your desired result will be possibly achieved.

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Calculating time taken - does this look right? Error!

    Please copy full text of error message and paste it here.
    The message should show the source with a ^ under the location of the error.
    Here is a sample from the javac compiler:
    TestSorts.java:138: cannot find symbol
    symbol  : variable var
    location: class TestSorts
             var = 2;
             ^
    If you don't understand my answer, don't ignore it, ask a question.

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