Do Java compilers calculate constant expressions during the compilation?

Asked Mar 02 '19 at 09:53

Active Mar 02 '19 at 09:53

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I've noticed that enum values in java.util.concurrent.TimeUnit have methods something like: public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }

Are expressions C3/C2 and MAX/(C3/C2) calculated during compilation or during runtime?

asked Mar 02 '19 at 09:53

Oleksandr

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During runtime. – Smit Mar 02 '19 at 09:55
If all these numbers are constants (`final static`) then it will be calculated at compile time – Thilo Mar 02 '19 at 09:56
c.f. https://stackoverflow.com/questions/9082971/compile-time-constants-and-variables – Polygnome Mar 02 '19 at 09:58
Yes, `C3`, `C2` and `MAX` are all constants (`final static`). Thank you very much for answers and pointing to the right questions! – Oleksandr Mar 02 '19 at 09:58
The linked duplicate talks about literals, but it also applies to compile-time constants, see https://stackoverflow.com/q/2012528/14955 – Thilo Mar 02 '19 at 09:59

Do Java compilers calculate constant expressions during the compilation?

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