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- Calendar (java.util)
Calendar is an abstract base class for converting between a Date object and a
set of integer fields
- Random (java.util)
This class provides methods that return pseudo-random values.It is dangerous to
seed Random with the
- TimeZone (java.util)
TimeZone represents a time zone offset, and also figures out daylight savings.
Typically, you get a
- Pattern (java.util.regex)
Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
- Cipher (javax.crypto)
This class provides access to implementations of cryptographic ciphers for
encryption and decryption
- Notification (javax.management)
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