import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    File myFile = new File("filename.txt");
    BufferedWriter bw = new BufferedWriter(new FileWriter(myFile));
    bw.write("Hello World");
    System.out.println(myFile.length());
    bw.flush();
    System.out.println(myFile.length());
    bw.close();
  }
}