||Overrides toArray() and toArray(Object) in AbstractCollection to provide
implementations valid for concurrent collections.
||This class provides skeletal implementations of some
||An optionally-bounded blocking queue based on
||This is a stripped down version of jdk1.5 ReentrantLock.
||A TimeUnit represents time durations at a given unit of
granularity and provides utility methods to convert across units,
and to perform timing and delay operations in these units.
This class groups together the functionality of java.util.concurrent that
cannot be fully and reliably implemented in backport, but for which some
form of emulation is possible.
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