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POBenchmark of Java Try/Catch Block
 

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  1. POBenchmark of Java Try/Catch Block
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    <p>I know that going into a catch block has some significance cost when executing a program, however, I was wondering if entering a try{} block also had any impact so I started looking for an answer in google with many opinions, but no benchmarking at all. Some answers I found were:</p> <ol> <li><a href="https://stackoverflow.com/questions/4280831/java-try-catch-performance-is-it-recommended-to-keep-what-is-inside-the-try-cla">Java try/catch performance, is it recommended to keep what is inside the try clause to a minimum?</a></li> <li><a href="https://stackoverflow.com/questions/8255878/try-catch-performance-java">Try Catch Performance Java</a></li> <li><a href="https://stackoverflow.com/questions/5158665/java-try-catch-blocks">Java try catch blocks</a></li> </ol> <p>However they didn't answer my question with facts, so I decided to try it for myself.</p> <p>Here's what I did. I have a csv file with this format:</p> <p><code>host;ip;number;date;status;email;uid;name;lastname;promo_code;</code></p> <p>where everything after status is optional and will not even have the corresponding ; , so when parsing a validation has to be done to see if the value is there, here's where the try/catch issue came to my mind.</p> <p>The current code that I inherited in my company does this:</p> <pre><code>StringTokenizer st=new StringTokenizer(line,";"); String host = st.nextToken(); String ip = st.nextToken(); String number = st.nextToken(); String date = st.nextToken(); String status = st.nextToken(); String email = ""; try{ email = st.nextToken(); }catch(NoSuchElementException e){ email = ""; } </code></pre> <p>and it repeats what it's done for email with uid, name, lastname and promo_code.</p> <p>and I changed everything to:</p> <pre><code>if(st.hasMoreTokens()){ email = st.nextToken(); } </code></pre> <p>and in fact it performs faster. When parsing a file that doesn't have the optional columns. Here are the average times:</p> <pre><code> --- Trying:122 milliseconds --- Checking:33 milliseconds </code></pre> <p>however, here's what confused me and the reason I'm asking: When running the example with values for the optional columns in all 8000 lines of the CSV, the if() version still performs better than the try/catch version, so my question is</p> <p><strong>Does really the try block does not have any performance impact on my code?</strong></p> <p>The average times for this example are:</p> <pre><code>--- Trying:105 milliseconds --- Checking:43 milliseconds </code></pre> <p>Can somebody explain what's going on here?</p> <p>Thanks a lot</p>
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    1. COeverytime checking the condition makes the program run slower. It is not a good idea to have multiple IF statements. Your company approach seems understandable. Whenever any errors are raised, you can have catch block to see what it is about.
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      1. USAlpesh Prajapati
    2. COI would not second this. In his case, email is optional, so `st` having no more tokens is not an exceptional case, but may happen very often. Using an exception here is no good style.
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    3. CONot only will happen very often, is the default behavior. We will only get the optional fields in many little occasions
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