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The BitSet class implements abit array [http://en.wikipedia.org/wiki/Bit_array].
Each element is eit
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A map that has its keys ordered. The sorting is according to either the natural
ordering of its keys
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JarFile is used to read jar entries and their associated data from jar files.
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Operations on java.lang.String that arenull safe.
* IsEmpty/IsBlank - checks if a String contains
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Is the value null?
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