Program for reading from a file

The following program opens a text file called test.txt, reads from it a line of text, and prints in on the video.

import java.io.*;

public class ReadingFromFile {
  public static void main(String[] args) throws IOException {
    // opening the file for reading
    FileReader f = new FileReader("test.txt");
    // creation of the object for reading
    BufferedReader in = new BufferedReader(f);

    // reading a line of text from the file
    String line = in.readLine();
    System.out.println(line);

    // closing the file
    f.close();
  }
}

Notes:

• Also in this case, the program that realizes the input must handle possible errors that may occur in accessing the file, by declaring:

  public static void main(String[] args) throws IOException
  

• If in a program we need to read again the content of the file starting from the first line, it is necessary to close the file and open it again for reading (see, e.g., the following paragraph).