question: public static double parseDouble ( byte [ ] bytes , int startIndex , int endIndex ) { if ( endIndex - startIndex == 8 ) { return Double . longBitsToDouble ( parseLong ( bytes , startIndex , endIndex ) ) ; } else if ( endIndex - startIndex == 4 ) { return Float . intBitsToFloat ( ( int ) parseLong ( bytes , startIndex , endIndex ) ) ; } else { throw new IllegalArgumentException ( "endIndex (" + endIndex + ") - startIndex (" + startIndex + ") != 4 or 8" ) ; } }
target:  Parses a double from a (big-endian) byte array.