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- ArrayList (java.util)
ArrayList is an implementation of List, backed by an array. All optional
operations including adding
- Iterator (java.util)
An iterator over a sequence of objects, such as a collection.If a collection has
been changed since
- Semaphore (java.util.concurrent)
A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
#acquire blocks if
- FileUtils (org.apache.commons.io)
General file manipulation utilities. Facilities are provided in the following
areas: * writing to a
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Is the value null?
- Rectangle (java.awt)
A Rectangle specifies an area in a coordinate space that is enclosed by the
Rectangle object's top-
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