question: public int difference ( String s1 , String s2 ) throws EncoderException { return SoundexUtils . difference ( this , s1 , s2 ) ; }
target:  Encodes the Strings and returns the number of characters in the two encoded Strings that are the same. This return value ranges from 0 through 4: 0 indicates little or no similarity, and 4 indicates strong similarity or identical values.