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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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A controller for the selection of SelectableChannel objects. Selectable channels
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Thrown when trying to retrieve an element past the end of an Enumeration or
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This class provides methods that return pseudo-random values.It is dangerous to
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XPath provides access to the XPath evaluation environment and expressions.
Evaluation of XPath Expr
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A generic Abstract Window Toolkit(AWT) container object is a component that can
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The GridBagLayout class is a flexible layout manager that aligns components
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