static public Class<? extends WritableComparable> getSequenceFileOutputKeyClass(JobConf conf) { 
    return conf.getClass("mapred.seqbinary.output.key.class", 
                         conf.getOutputKeyClass().asSubclass(WritableComparable.class),
                         WritableComparable.class);
  }
static public Class < ? extends WritableComparable > getSequenceFileOutputKeyClass ( JobConf conf ) { return conf . getClass ( "mapred.seqbinary.output.key.class" , conf . getOutputKeyClass ( ) . asSubclass ( WritableComparable . class ) , WritableComparable . class ) ; }
Get the key class for the {@link SequenceFile}

@return the key class of the {@link SequenceFile}