Question

Information :

when I execute my program, a simple file reader, I get an exception.

I have my file saved next to my .java files.

Output :

run:
name : Koen
score : 44
Exception in thread “main” java.util.NoSuchElementException: No line found
name : Kevin
score : 55
at java.util.Scanner.nextLine(Scanner.java:1585)
at tetris.FileIO.loadHighscores(FileIO.java:41)
at tetris.FileIO.getLineScores(FileIO.java:28)
at tetris.FileIO.main(FileIO.java:62)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

Code:

package tetris;

import java.io.File;
import java.io.InputStream;
import java.io.Writer;
import java.util.Scanner;

public class FileIO   {
    private File file;
    private Scanner filescScanner, lineScanner;
    private Writer fileWriter, lineWriter;
    private String[][] data;

    public FileIO () {
        String[][] data = new String[100][1];
    }
    public String[][] getLineScores(){
        return this.loadHighscores(this.getClass().getResourceAsStream("LineHighscores.txt"));
    }
    public String[][] getTimeScores(){
        return this.loadHighscores(this.getClass().getResourceAsStream("TimeHighscores.txt"));
    }

    public String[][] loadHighscores( InputStream resourceStream){

        int x=0;
        String test = "";

        filescScanner = new Scanner(resourceStream);

        while((test=filescScanner.nextLine())!=null) {

            lineScanner = new Scanner(test);
            lineScanner.useDelimiter("-/-");
            System.out.println("name : "+lineScanner.next());
            System.out.println("score : " +lineScanner.next());

            x++;
        }
        lineScanner.close();
        filescScanner.close();
        return data;    
    }

    public static void main(String[] args){
        FileIO file = new FileIO();
        System.out.println(file.getLineScores());
    }
}

Answer 1

When you are calling nextLine():

 while((test=filescScanner.nextLine())!=null)

it is throwing an exception to indicate that the scanner has no more lines of input. Thus, it will never return null.

Try instead to use hasNextLine() to check if there is a next line.

while(filescScanner.hasNextLine())
{
    test=filescScanner.nextline();
    ...
}

hasNextLine

public boolean hasNextLine()

Returns: true if and only if this scanner has another line of input (source)

Therefore, when the scanner do not have any more lines of input to read, hasNextLine() will return false. Hence, terminating the cycle.