For a Software profession, every day there are new things to learn. With constant updating of technologies surrounding our technical and domain expertise, we should have a strong base knowledge around with we have to build our technical skills in line with new developments.
For a java developer, we should build our base knowledge around fundamentals of Java language and be strong in java interfaces, generics, annotations, concurrency etc., It's easy to learn quickly new technologies when you master the fundamentals.
Here is a list of things which (out of many things) a java developer must be aware of.
1. How does JVM work?
2. Improvements on language from major version changes (Generics, Annotations, Enums ...).
3. What are the OOPS concepts and how do they Implemented in Java?
4. Understand design pattern
5. Coding Conventions.
6. Build tool (Ant) or Project Management Tool (Maven).
7. At least basic knowledge of some popular frameworks such as Struts, springs, hibernate.
8. Writing test cases using Junit.
9. Good knowledge of Eclipse ( or any popular IDE ).
10. Knowledge of using log4j.
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