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import java.io.*;

public class CharIOExam{
  public static void main(String[]args){
     PrintWriter hello = null;
    try{        

      hello = new PrintWriter(new FileWriter("data.txt"));
      String hi = null;
      while((hi = hello.println()) !=null){
       hello.Println(hi);
      }    
            }catch(Exception e){
                e.printStackTrace();
            }finally {
                hello.close();
            } 
    System.out.println("안녕하세요. PrintWriter입니다.");
  }
}