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POHow to find the difference of two timestamps in java?
 

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  1. POHow to find the difference of two timestamps in java?
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    <p>I have an <code>ArrayList</code> including several number of time-stamps and the aim is finding the difference of the first and the last elements of the <code>ArrayList</code>.</p> <pre><code>String a = ArrayList.get(0); String b = ArrayList.get(ArrayList.size()-1); long diff = b.getTime() - a.getTime(); </code></pre> <p>I also converted the types to int but still it gives me an error <code>The method getTime is undefined for the type String</code>.</p> <p>Additional info :</p> <p>I have a class A which includes </p> <pre><code>String timeStamp = new SimpleDateFormat("ss S").format(new Date()); </code></pre> <p>and there is a class B which has a method <code>private void dialogDuration(String timeStamp)</code></p> <p>and <code>dialogueDuration</code> method includes:</p> <pre><code>String a = timeSt.get(0); // timeSt is an ArrayList which includes all the timeStamps String b = timeSt.get(timeSt.size()-1); // This method aims finding the difference of the first and the last elements(timestamps) of the ArrayList (in seconds) long i = Long.parseLong(a); long j = Long.parseLong(b); long diff = j.getTime()- i.getTime(); System.out.println("a: " +i); System.out.println("b: " +j); </code></pre> <p>And one condition is that the statement(<code>String timeStamp = new SimpleDateFormat("ss S").format(new Date());</code>) wont be changed in class A. And an object of class B is created in class A so that it invokes the <code>dialogueDuration(timeStamp)</code> method and passes the values of time-stamps to class B.</p> <p>My problem is this subtraction does not work, it gives an error <code>cannot invoke getTime() method on the primitive type long</code>. It gives the same kind of error also for int and String types?</p> <p>Thanks a lot in advance!</p>
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    1. USJasonMArcher
    1. USuser2052015
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    1. COWell what did you *expect* `getTime()` to do, when called on a string? What *exactly* does your `ArrayList` consist of? (And why do you apparently have a variable called `ArrayList`? That's very confusing.)
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      1. POHow to find the difference of two timestamps in java?
      1. USJon Skeet
    2. COi expect getTime() to help me to find the difference of the first and last timestamps.but apparently it does not work wirith Strings but it does not work either with integer type. My Arraylist consists of only timestamps. my variable doesnt called actually Arraylist.i wrote ot like this just to make it obvious that it is an array list.
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      1. POHow to find the difference of two timestamps in java?
      1. USuser2052015
    3. COYou need to show samples of your *actual data*.Just saying they're strings is not terribly helpful - strings in what format?
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      1. POHow to find the difference of two timestamps in java?
      1. USJon Skeet
 

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