java - Custom readLine -

i need implement custom readline method, following signature:

public string readline(int maxlinelength) 

so i've created:

public string readline(int maxlinelength) throws readinglineexception {      if (this.eofreached){         return null;     }      stringbuilder bld = new stringbuilder();      try {          int readcount = 0;          int charcode;         while ((charcode = this.readable.read()) > -1                     || readcount <= maxlinelength) {             readcount += 1;             bld.append((char)charcode);         }          if (readcount > maxlinelength){             throw new readinglineexception("maximum line length reached.");         }          if (charcode == -1) {             this.eofreached = true;         }          return bld.tostring();     } catch (ioexception e) {         e.printstacktrace();         throw new readinglineexception();     } } 

so.. how can detect end of line using read? don't think simple

(char)charcode == '\n' 

because not work in other system (where eol marked \n\r)

i though read additional char after \n , determine if \r, -1 or other char. if '\r' i've reached eol , ok, when -1 same case when other char, i'd start on next readline. proper way?

you ignore '\r'. if char '\r', read another.