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Return the contained value, if present, otherwise throw an exception to be
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HashMap is an implementation of Map. All optional operations are supported.All
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A Properties object is a Hashtable where the keys and values must be Strings.
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A map that has its keys ordered. The sorting is according to either the natural
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A plug-in replacement for JDK1.5 java.util.concurrent.ConcurrentHashMap. This
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This is the central class in the log4j package. Most logging operations, except
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