import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

/**
 * Reading from a file
 * @author gtowell
 * Created Sep 2020
 */
public class FileOpen {
    // the name of the file to be read
    String fileName;

    /** Base constructor.
     * Private so it cannot be used by outsiders
     */
    private FileOpen() {
        super();
    }
    /** Constructor taking the name of the file to be read
     * @param fn the name of the file to be read
     */
    public FileOpen(String fn) {
        this();
        fileName=fn;
    }

    /**
     * Use resources to read one line from a file
     * This is the safer way!
     */
    public void readOneLineTCR()
    {
        try (BufferedReader br = new BufferedReader(new FileReader(fileName));) {
            System.out.println("TCR: " + br.readLine());
        } catch (FileNotFoundException e) {
            System.err.println("Cound not open file " + e);
        }  catch (IOException e) {
            System.err.println("Problem reading " + e);
        }
    }

    /**
     * Without Resources.  It works, but takes a lot more code
     */
    public void readOneLineTC()
    {
        BufferedReader br=null;
        try {
            br = new BufferedReader(new FileReader(fileName));
            System.out.println("TC: " + br.readLine());
        } catch (FileNotFoundException fnf) {
            System.err.println("Cound not open file " + fnf);
        }  catch (IOException e) {
            System.err.println("Problem reading " + e);
        } finally {
            if (br!=null) {
                try {
                    br.close();
                } catch (IOException ioe) {
                    System.err.println("Problem closing reader " + ioe);
                }
            }
        }
    }

    public static void main(String[] args) {
        try (Scanner scanner = new Scanner(System.in);) {
            System.out.print("Enter file to be read: ");
            String name = scanner.nextLine();
            new FileOpen(name).readOneLineTC();
            new FileOpen(name).readOneLineTCR();
        } finally {}
    }
}