I want to build up my career in java. Which are the most important topics in Java?

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Gnv Satyanarayana

OOPS, Language fundamentals, Exception handling, Collection framework, Multithreading
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Mathematics Tutor with rich experience

OOPS concepts, threads,collection framework, exception handling, Strings class.
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I've completed my BE in EEE june 2018. Currently looking for job but ain't finding anything suitable and every time its BPO/KPO's and I'm not intrested. Looking forward to learn any computer language like c/c++ or java and start a career in IT. Any advice on my choices? Which IT course is suitable and advisable for a begineer ?
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