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I'm a little confused. Are you asking how to learn Java in 72 hours or have you been developing the last 3 years "mostly writing code in Java".

Your previous comments say that......(132 days ago).....

>"Beyond CRUD and ETL – How to Grow Professionally?

Since last 3 years I have been working with Big Data applications on Hadoop platform mostly writing code in Java and using abstract language/platform such as Pig, Spark , RedShift , Hive.">

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Sorry, I was not clear. I want to learn java enough to write working code in next 72 hours. I know python and how to write programs.

About my comment ( 132 days ago ) - I meant Python and not Java. It must have been competing thoughts or something I was discussing with someone and wrote incorrectly without proofreading.

That makes more sense (Python not Java) with the other technologies you mentioned.

Writing "working code" in Java in 3 days is extremely ambitious, unless by working code you mean some version of "Hello World."

There are solid developers (who if for some reason had no exposure to Java) who would have trouble writing "working code" in three weeks. Again..if working code was something commercial.

I guess it really matters how you define working code.

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