import java.nio.file.Path;
import java.nio.file.Files;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.FileNotFoundException;
public class Cat
{
    public static void main(String[] args)
    {

        Path p = Path.of(args[0]);
        //try with resources closes the file for you
        try(BufferedReader br = Files.newBufferedReader(p);)
        {
            String line = "";
            while( (line = br.readLine()) != null)
            {
                System.out.println(line);
            }
        }
        catch(FileNotFoundException ex)
        {
            System.err.printf("File %s not found.\n", 
               Files.toAbsolutePath(p));
        }
        catch(IOException ex)
        {
            ex.printStackTrace();
        }
    }
}