import java.io.FileInputStream;
import java.io.IOException;

public class Main {
  public static void main(String[] args) {
      // "try-with-resources": the stream will be closed automatically
      try (FileInputStream input = new FileInputStream("filename.txt")) {
      int i;
      while ((i = input.read()) != -1) {
        System.out.print((char) i);
      }
    } catch (IOException e) {
      System.out.println("Error reading file.");
    }
  }
}