import java.io.*;

public class ReadTextFile {
    public static void main(String[] args) throws Exception {
        if (args.length < 1) {
            System.out.println("Usage: java " 
                              + ReadTextFile.class.getName()
                              + " <input file>");
            System.exit(1);
        }

        String fileName = args[0];

        // nested initialization, 
        // or in design pattern jargon, decorate FileInputStream with
        // BufferedInputStream.
        BufferedReader in = new BufferedReader(new FileReader(fileName));
        try {
            // read file line by line
            String line = in.readLine();
            while (line != null) {
                processLine(line);
                line = in.readLine();
            }
        }
        finally { // always close input stream
            in.close();
        }
    }

    private static void processLine(String line) {
        System.out.println(line);
    }
}