Reading text files using Scanner and "No Line Found"

Question

I am trying to use the Java Scanner class to read a text file all the way through and section each of the strings into the respected datatype such as a string "123" into long number = 123.

Here is my code:

public static void main(String[] args) throws NoSuchElementException, FileNotFoundException, IOException{
    String filelocation = "file.txt";//this is for file path 

    ProductList p = new ProductList();
    try {
        File myObj = new File(filelocation);
        Scanner src = new Scanner(myObj);
        while (src.hasNextLine()) {
            long id = Long.parseLong(src.nextLine());
            String data = src.nextLine();
            double op = Double.parseDouble(src.nextLine());
            double cp = Double.parseDouble(src.nextLine());
            String space = src.nextLine(); //without this line I get an error input ""
             System.out.println(id +"\n"+ data +"\n"+ op +"\n"+ cp+"\n" + space);
        }
        src.close();
    } catch (FileNotFoundException e) {
        System.out.println("An error occurred.");
        e.printStackTrace();
    }
}

Here is the content in the text file:

121 
Dining Table
129.99
119.99

1007
Leather Storage Ottoman
199.99
199.99

264
Gas-Powered Chainsaw
249.99
189.99

763
Protected Cruiser Takasago, 1898, 1/350, resin model kit
239.99
199.99

7465
Vacuum Cleaner, Green, 2252
99.99
89.99

354
Alienware 55 OLED Gaming Monitor - AW5520QF
4049.99
3039.99

Here is the output:

I do not understand why it is not printing the last item and how to take care of the error no line found. I understand you can throw an exception for illegals but I try that and still get the error.

Answer 1

At the end of file, an empty line is missing. In fact, it throws an exception when tries to read the last space at line String space = src.nextLine();.

You can fix checking if the last space exists.

public static void main(String[] args) throws NoSuchElementException, FileNotFoundException, IOException{
    String filelocation = "file.txt";//this is for file path 

    ProductList p = new ProductList();
    try {
        File myObj = new File(filelocation);
        Scanner src = new Scanner(myObj);
        while (src.hasNextLine()) {
            long id = Long.parseLong(src.nextLine());
            String data = src.nextLine();
            double op = Double.parseDouble(src.nextLine());
            double cp = Double.parseDouble(src.nextLine());
            if (src.hasNextLine()) {
                src.nextLine(); //read the space just if exists and it is not necessary to put it in a variable
            }
            System.out.println(id + "\n" + data + "\n" + op + "\n" + cp + "\n");
        }
        src.close();
    } catch (FileNotFoundException e) {
        System.out.println("An error occurred.");
        e.printStackTrace();
    }
}