Java's SimpleDateFormat is a Disaster Waiting to Happen

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I bet you've used SimpleDateFormat in Java before! It's a quick, easy, super reliable way to parse and format dates....
Right?
Sometimes, not at all!!

Learn about a dangerous situation involving SimpleDateFormat in this quick Java lesson.

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I would love to see a video where you explain threads, web applications etc in Java. I am on my second year in my Java courses and I haven't even heard any of these terms in class. You seem very knowledgeable and I would enjoy learning about it.

nunya

7:27 thank you. I can not stress the importance of always offering a solution to an identified problem. Thanks.

ndk

Had a similar experience, company I used to work at uses alot of excel to do calculations. Then one day, after years since that excel calculator tool got deployed to prod, one internal user realised some calculation results were way off, turns out a previous developer (probably an intern) created just 1 static instance of the excel workbook, and it just so happened that years later, at exactly the same moment, 2 requests wrote to the excel file at exactly the same time

TheMoviemaker

FastDateFormat wierdness:

Ran the example given. Gives the expected output:

10 x "Successfully parsedThu Oct 17 12:34:51 AEST 2024"

Every now and again though (if I hit it hard enough) I get:

"Successfully parsedThu Oct 17 12:34:51 GMT+10:00 2024"

Which is the same, but how come sometimes it picks up the correct named timezone, and sometimes not?

cthoadmin

I realy like your videos. Short and very clear.
hmm is the naming convention of dataFormat not DATE_FORMAT?

pascalclement

Ok. I’m an experienced developer, so I know what and why this happening. But blaming SDF is an oversimplified and misleading to newer folks. There are many many classes that are not thread safe. Any time you are doing things in multi-threaded manor you should *never* used shared instances of things unless you absolutely *know* for certain they are thread safe.

brucehartweg