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- SQLException (java.sql)
An exception that indicates a failed JDBC operation. It provides the following
information about pro
- Arrays (java.util)
This class contains various methods for manipulating arrays (such as sorting and
searching). This cl
- Random (java.util)
This class provides methods that return pseudo-random values.It is dangerous to
seed Random with the
- Semaphore (java.util.concurrent)
A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
#acquire blocks if
- Logger (org.apache.log4j)
This is the central class in the log4j package. Most logging operations, except
configuration, are d
- Color (java.awt)
The Color class is used to encapsulate colors in the default sRGB color space or
colors in arbitrary
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