unicode - Java Scanner Class bad character "®" -

i have scanner class reading file string. file character "®" causes fail. i'm new java, there better way read file character accepted?

public void readfile(string filename) {     filetext = "";      try     {         scanner file = new scanner(new file(filename));         while (file.hasnextline())         {             string line = file.nextline();             filetext += line +"\r"+"\n";         }         file.close();     }     catch (exception e)     {          system.out.println(e);     }       } 

by default scanner uses platform default character encoding, might not match character encoding of file. javadoc states:

constructs new scanner produces values scanned specified file. bytes file converted characters using underlying platform's default charset.

first determine character encoding file in, can done linux command line utility file -i. pass correct encoding scanner. java 7 contains predefined constants in java.nio.charset.standardcharsets known character sets.

scanner file = new scanner(new file(filename), standardcharsets.utf_8);