Why my linebreak checker is not giving the expected result?

I have created a project using Java to simulate a Library, I have a method named "Arrumbadas" that return those publishings which have never been lend separated by a linefeed and a test that only checks if each line of this result ("Arrumbadas" method) has a linefeed at the end.

I have implemented "Arrumbadas" method as follow:

(Omitted code)
     result = new StringBuilder();
      for(omitted code){
       if(omitted code){
         result.append(publishing).append(\n)
        }
       }
      return result.toString()

I have implemented the test as follow:

  public static boolean hasLineFeed(String t){
        Scanner text = new Scanner(t);
        while(text.hasNextLine()){
            String line = text.nextLine();
            System.out.println(line);
            if(!line.endsWith("\n") && !line.isEmpty()){
                return false;
            }
        }

        return true;
    }

Given this certain text:

"9780547928227","The Hobbit","J.R.R. Tolkien","2","0","High fantasy"
"9780316769174","The Catcher in the Rye","J.R.R. Tolkien","3","0","Coming-of-age fiction"
"9780143124672","Moby-Dick","J.R.R. Tolkien","1","0","Adventure fiction"

The output of the test is:

"9780547928227","The Hobbit","J.R.R. Tolkien","2","0","High fantasy"
Has linefeed: false

Figure out that .hasNextLine() doesnt include the delimiter, neither does .split() that I had used it before. Is there a way to read the text by lines without removing the delimiters?

The Scanner class (Java 17 at least) uses the following regex to match a line separator:

\r\n|[\n\r\u2028\u2029\u0085]

As you can see, this will match a CR, an LF or a CR followed by a LF¹. After matching, line separator at the end of the line is then removed, as per the javadoc. That means that readLine() will NEVER return a line that ends with an LF (i.e. '\n') or a CR (i.e. '\r').

> Is there a way to read the text by lines without removing the delimiters?

Not using Scanner.nextLine() or BufferedReader.readLine(). If you really need to preserve the line separator, the simplest way is to use a for loop to read a characters from BufferedReader, recognize line separators, and assemble lines yourself. You can then include the line separators in the line strings, or put them into a different variable.

HOWEVER ... it is not obvious to me why you need to preserve the line separators if you are simply reading a CSV file. If I was doing this, I would use BufferedReader.readLine to read each line, and then use a Scanner or String.split or something more sophisticated to deal with the commas and quotes.

Or ... find and use a 3rd party CSV parser library and save the effort of implementing the code yourself.

^{1 - ... and some other obscure codes that you've probably never heard of.}