public V get() throws InterruptedException, ExecutionException {
    return sync.get();
}
private final boolean parkAndCheckInterrupt() {
    LockSupport.park(this);
    return Thread.interrupted();
}
--
public V get() throws InterruptedException, ExecutionException {
    return sync.get();
}
private final boolean parkAndCheckInterrupt() {
    LockSupport.park(this);
    return Thread.interrupted();
}
--
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