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HashSet is an implementation of a Set. All optional operations (adding and
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Timers schedule one-shot or recurring TimerTask for execution. Prefer
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XPath provides access to the XPath evaluation environment and expressions.
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General IO stream manipulation utilities. This class provides static utility
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Operations on java.lang.String that arenull safe.
* IsEmpty/IsBlank - checks if a String contains
- Option (scala)
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