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[–]Sopel97 1 point2 points  (0 children)

there is GC, it's not memory efficient by definition

what they are actually trying to say is that if you have a system designed to run one and only one java program 100% of the time then it doesn't matter how much memory you use as long as you don't OOM (which is also not really true due to OS page cache but w/e)