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A specialized Reader that reads from a file in the file system. All read
requests made by calling me
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A connection to a URL for reading or writing. For HTTP connections, see
HttpURLConnection for docume
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Calendar is an abstract base class for converting between a Date object and a
set of integer fields
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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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A plug-in replacement for JDK1.5 java.util.concurrent.ConcurrentHashMap. This
version is based on or
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Is the value null?
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