Scanner isn’t picking up all the lines

Question

I have a file with 7 million lines, but my code takes at most 63000 and returns no error.

Scanner sc2 = null;
    try {
        sc2 = new Scanner(new File("./assets/words.txt"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();  
    }

    int cont = 0;

    while(sc2.hasNextLine()) {
        String s = sc2.next();
        System.out.println(s + " - " + cont);
        cont++;
    }

Answer 1

I believe it may be due to memory usage limitations of the class File, try the form below, suggested in a similar question in Soen:

BufferedReader br = new BufferedReader(new FileReader(filepath));
String line = "";
while((line=br.readLine())!=null)
{
    // do something
}

Or if you don’t want to change the whole implementation, try switching File for FileReader:

Scanner sc2 = null;
    try {
        sc2 = new Scanner(new FileReader("./assets/words.txt"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();  
    }

    int cont = 0;

    while(sc2.hasNextLine()) {
        String s = sc2.next();
        System.out.println(s + " - " + cont);
        cont++;
    }

The difference between File and FileReader is that the first is just an abstract representation of the file, the second is the class for reading characters from files, ie, File does not represent a file, and yes, its path only, while FileReader is the representation of the data(characters) of this file.

References:

• Scanner Reading large file

• Java Filereader vs File