Java Reader.markSupported()

public boolean markSupported()

//from  w w w.  j a  va 2s.c o m
import java.io.*;

public class Main {

   public static void main(String[] args) {

      String s = "tutorial from java2s.com";

      // create a new StringReader
      Reader reader = new StringReader(s);

      try {
         // read the first five chars
         for (int i = 0; i < 5; i++) {
            char c = (char) reader.read();
            System.out.println(c);
         }
         System.out.println(reader.markSupported());
         reader.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}