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finalgives you a compiler-enforced guarantee that the program won't modify the value. I wouldn't dispense with that just because the programmer might want to modify the value assigned in the source code.gravitymid-game/run. They don't necessarily mean,gravityis the same on every planet ... That said, the healthy solution is to makegravitya constant, but pull it from aplanetfile or database at the start of the relevant scope.