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.">
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.">