# Package org.apache.lucene.codecs.lucene40

Support for testing `Lucene40PostingsFormat`.

See: Description

- Class Summary
  Class | Description
  --- | ---
  Lucene40FieldInfosWriter | Lucene 4.0 FieldInfos writer.
  Lucene40PostingsWriter | Concrete class that writes the 4.0 frq/prx postings format.
  Lucene40RWCodec | Read-write version of Lucene40Codec for testing
  Lucene40RWDocValuesFormat | Read-write version of `Lucene40DocValuesFormat` for testing
  Lucene40RWNormsFormat | Read-write version of `Lucene40NormsFormat` for testing
  Lucene40RWPostingsFormat | Read-write version of `Lucene40PostingsFormat` for testing.
  Lucene40SkipListWriter | Deprecated Only for reading old 4.0 segments

## Package org.apache.lucene.codecs.lucene40 Description

Support for testing `Lucene40PostingsFormat`.

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