question: @ Override public String readLine ( ) throws IOException { if ( this . pointer >= this . length - 1 ) { return null ; } else { final StringBuilder buf = new StringBuilder ( ) ; int c ; while ( ( c = read ( ) ) >= 0 ) { if ( ( c == 10 ) || ( c == 13 ) ) { if ( ( ( peek ( ) == 10 ) || ( peek ( ) == 13 ) ) && ( peek ( ) != c ) ) { read ( ) ; } break ; } buf . append ( ( char ) c ) ; } return buf . toString ( ) ; } }
target:  return next line (returns null if no line)