Created
July 8, 2022 04:59
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| - was immutable by default (parameters, variables, and fields. make mutable with `mut` keyword. `final` only applies to classes to prevent subclassing.) | |
| - was non-null by default (to allow a variable to be null, mark it with `?`) | |
| - removed legacy API (java.io, java.util.Date, java.util.Calendar) |
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