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Return the contained value, if present, otherwise throw an exception to be
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An immutable arbitrary-precision signed decimal.A value is represented by an
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HashMap is an implementation of Map. All optional operations are supported.All
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Defines a general exception a servlet can throw when it encounters difficulty.
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The Color class is used to encapsulate colors in the default sRGB color space or
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The GridBagLayout class is a flexible layout manager that aligns components
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