1. for iterationCount = 5000, the StringBuilder method's time is always 0ms. StringBuffer method's time is sometimes 0, sometimes ~16 ms.
2. for iterationCount = 50000, the StringBuffer method's time is always 0ms. StringBuilder method's time is sometimes 0, sometimes ~16 ms.
Q1. Why should one method in either case yield 0 always(5000â†’StringBuilder , 50000â†’StringBuffer )?
Q2. Why, upon changing the iterationCount from 5000 to 50000 or viceversa, the 0 ms elapse time method is changed?
The output on my "intel Core i5 XP" machine is as follows:
Output
47ms over 5000 iterations for "+"
15ms over 5000 iterations for String concat method
16ms over 5000 iterations for StringBuffer append method
0ms over 5000 iterations for StringBuilder append method
47ms over 5000 iterations for "+"
31ms over 5000 iterations for String concat method
0ms over 5000 iterations for StringBuffer append method
0ms over 5000 iterations for StringBuilder append method
47ms over 5000 iterations for "+"
16ms over 5000 iterations for String concat method
0ms over 5000 iterations for StringBuffer append method
0ms over 5000 iterations for StringBuilder append method
47ms over 5000 iterations for "+"
15ms over 5000 iterations for String concat method
16ms over 5000 iterations for StringBuffer append method
0ms over 5000 iterations for StringBuilder append method
7515ms over 50000 iterations for "+"
2938ms over 50000 iterations for String concat method
0ms over 50000 iterations for StringBuffer append method
0ms over 50000 iterations for StringBuilder append method
7640ms over 50000 iterations for "+"
2985ms over 50000 iterations for String concat method
0ms over 50000 iterations for StringBuffer append method
0ms over 50000 iterations for StringBuilder append method
7547ms over 50000 iterations for "+"
2969ms over 50000 iterations for String concat method
0ms over 50000 iterations for StringBuffer append method
15ms over 50000 iterations for StringBuilder append method
7765ms over 50000 iterations for "+"
3000ms over 50000 iterations for String concat method
0ms over 50000 iterations for StringBuffer append method
16ms over 50000 iterations for StringBuilder append method
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Edit: With nanoTime(), I could get the time properly and see the time difference. It was < 0 ms for some which are posted as 0 here.
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