There are many certification and exams available in Java world which check if you have acquired enough competency in this technology.  You may have taken may of those and cleared with high scores. But here is something which comes from my experience of Java developers around me. Ask these simple test questions to yourself and know if you really understand Java programming and can appreciate this technology.

1. Can you write NullPointerException free Java code?
2. Can you write ClassCastException free Java code?

If you are getting affirmative answers for both the questions, then you understand how does it all works.

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