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An output stream that writes bytes to a file. If the output file exists, it can
be replaced or appen
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Note: Do not use this class since it is obsolete. Please use the Map interface
for new implementatio
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HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
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A Set is a data structure which does not allow duplicate elements.
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An int value that may be updated atomically. See the java.util.concurrent.atomic
package specificati
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Is the value null?
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