One more thing, you only need ONE job and there are PLENTY of jobs in Java, C, C++, COBOL, PHP.
Becoming a one-trick pony is not very good career advice for people working in IT. There are plenty of one-trick ponies that get replaced by people capable of working in more than one language, and get stuck in dead-end jobs working on maintaining 30 year old software because they thought there are enough jobs for COBOL.
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