[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] ellipsis (...), varargs and enhanced for enumerated types (see enums) EnumMap, creating enums as classes as indices as keys contructors creating 2nd declarations inline defining manually DownloadStatus extending extensions in arrays integers interating over interface implementation jump tables and methods, adding to sets simple enums switch statement and value-specific class bodies values, importing erasure, type safety and exceptions, threads and Exchanger, synchronizer classes execution logic versus thread logic Executors class as service scheduling execution ExecutorService, executing tasks without expressions, for/in loop extensionscollection classes enum
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