import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class Driver {
    public static void main(String[] args) {
        String fileName = "p1.txt";
        Scanner inputStream = null;
        System.out.println("The file " + fileName + "\ncontains the following lines: \n");
        try
        {
            inputStream = new Scanner(new File(fileName));
        }
        catch(FileNotFoundException e)
        {
            System.out.println("Error opening the file " + fileName);
            System.exit(0);
        }
        while(inputStream.hasNextLine())
        {
            String line = inputStream.nextLine();
            System.out.println(line);
        }
        inputStream.close();
    }
}

p, -4, 5
q, 19, 8
r, 3, 0
x, 7.4, -1
y, -2.3,  -16.5
z, 0, 1

The file p1.txt
contains the following lines: 
Error opening the file p1.txt
我不确定我需要做什么。