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BS. It's not like people are turning down Jobs at Google and Apple because they don't pay enough or wont negotiate on salary. These companies are hiring everyone that's qualified and passes the interview. The advanced tech worker shortage is real and is completely orthogonal to salary shenanigans.
Yes, the concern is real and common. The antidote is building stuff. A bunch of stuff. The more stuff you build, the more likely it is you'll have to get "dirty" with the underlying guts of it, the more you'll know, and the more valuable you'll be.
Of the many garbage collectors Java offers, have you ever used anything but the default? Do you have any idea what the trade-offs are and when you might want to use another one?
Have you ever profiled any Java code?
What do you know about Java byte code?
Ever SWIG wrap anything into Java?
Ever used Java serialization? Do you know what's wrong with it and why you wouldn't want to use it?
Custom class loaders?
My adivce: go learn everything there is to know about "something", it doesn't really matter what (maybe you want be the worlds foremost expert on malloc). In the process of gaining a very, very deep understanding of that 1 specific sliver; you're going to also learn about a ton of other stuff on the way.
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Turchin is credited with coining the term cliodynamics, which is the study of historical mathematical data like population figures and global economic performance to identify patterns of similar behavior. Turchin's studies point to a cycle in which society at large becomes engulfed in widespread violence every 50 years.
The current pattern dates back at least to 1870, when economic disparity in the U.S. led to urban violence, and follows the 50-year cycle to the anti-Communist fervor and race riots around 1920, followed by the political assassinations, terrorist attacks and domestic violence in 1970, Turchin told Nature. By that logic, Turchin believes we should circle the year 2020 on our calendars as the year when we start locking our doors."
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Too small to see.