[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] scheduled thread executor scheduling execution semaphores services, Executor class as sets of enums shadowing imports, static methods simple enums single thread executor single-value annotations static imports shadowing wildcards in static members, importing static variables, parameterization and StringBuffer, replacing with StringBuilder code StringBuilder superclasses, overriding methods supplementary characters, codepoints SuppressWarnings annotation SuppressWarnings annotation type 2nd surrogate pairs switch statement, enums synchronizationadvanced synchronization options locking and synchronizer classes CountDownLatch CyclicBarrier Exchanger semaphores Synchronous Queue
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