Java PushbackReader.ready()

public boolean ready()  throws IOException

/*from   ww w .ja  va 2  s . com*/

import java.io.*;

public class Main {

   public static void main(String[] args) {

      String s = "from java2s.com";

      StringReader sr = new StringReader(s);

      // create a new PushBack reader based on our string reader
      PushbackReader pr = new PushbackReader(sr, 20);
      
      try {
         // check if the reader is ready
         System.out.println(pr.ready());


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

         pr.close();

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