java - Unexpected result when writing a Unicode(UTF-8) text to file -

i have problem when writing unicode(utf-8) text file java. want writ text in other language (persian) file in java, receive unexpected result after run app.

 file file = new file(outputfilename);  fileoutputstream f = new fileoutputstream(outputfilename);  string encoding = "utf-8";  outputstreamwriter osw = new outputstreamwriter(f,encoding);  bufferedwriter bw = new bufferedwriter(osw);   stringbuilder row = new stringbuilder();  row.append("some text in english language");  // in below code should  4 space before علی  row.append("    علی");    // in below code should 6 space before علی یاری   row.append("      علی یاری");  bw.write(row.tostring());  bw.flush(); bw.close(); 

how can solve problem?

the output expected according unicode bidirectional algorithm. entire persian text rendered right-to-left. if want individual words laid out left-to-right, need insert left-to-right character between 2 persian words. there's special character this: left right mark (u+200e). modification code should produce correct output:

row.append("some text in english language"); row.append("    علی"); row.append('\u200e'); row.append("      علی یاری");