Tukukkk

I keep getting this exception when I run my code:

Exception in thread "main" java.util.NoSuchElementException: No line found

at java.base/java.util.Scanner.nextLine(Unknown Source)

at BattleshipCheck.generateGrid(BattleshipCheck.java:60)

here's my code:

public static int generateGrid(Scanner in, int gridSize) {

    int grid = new int[gridSize][gridSize];

    while(in.hasNextLine()) {

    in.nextLine();

    in.nextLine();

    String currentLine = in.nextLine().split("\s+");

    for (int row = 0; row < gridSize; row++) {

        for (int column = 0; column < gridSize; column++) {

             grid[row][column] = Integer.parseInt(currentLine[column]);

        }

    }

    }

    return grid;





}

The text file looks like this:

8

4 2 3 4 5

0 0 0 0 0 0 0 0

1 1 1 1 0 0 0 1

0 0 0 0 1 0 0 1

0 0 0 0 1 0 0 1

0 1 1 0 1 0 0 0

0 0 0 0 1 0 0 0

0 0 0 0 1 0 0 0

0 0 0 0 0 0 0 0

I'm trying to start reading from the third row so I used .nextLine twice and I'm thinking that's where my problem lies but I'm not sure how to fix it

If you want to start at the third row, call nextLine() before the while-Loop, not inside of it. Once you're at the last line, you try skipping two more lines, which dont exist. You'll also have to check whether the file actually has three lines before skipping two lines.

public static int generateGrid(Scanner in, int gridSize) {

int grid = new int[gridSize][gridSize];



if(in.hasNextLine())in.nextLine();

if(in.hasNextLine())in.nextLine();



while(in.hasNextLine()) {

String currentLine = in.nextLine().split("\s+");

for (int row = 0; row < gridSize; row++) {

    for (int column = 0; column < gridSize; column++) {

         grid[row][column] = Integer.parseInt(currentLine[column]);

    }

}

}

return grid;

}

Looks like you are ignoring the data in the file. It tells you how many lines there are. Also, there is no need for a while loop.

public static int generateGrid(Scanner in) {

    // Get gridSize from file

    int gridSize = Integer.parseInt(in.nextLine());

    int grid = new int[gridSize][gridSize];



    // Not sure what 2nd line is for

    // I'm guessing it is the number of ships followed

    // by the size of each ship

    in.nextLine();



    for (int row = 0; row < gridSize; row++) {

        // Move this here

        String currentLine = in.nextLine().split("\s+");

        for (int column = 0; column < gridSize; column++) {

             grid[row][column] = Integer.parseInt(currentLine[column]);

        }

    }



    return grid;

}

You still need to add error checking in case the file is malformed. Although I would leave as-is an let it throw an exception if there is a problem. Let the calling function deal with it.

int i=0;

public static int generateGrid(Scanner in, int gridSize) {

    int grid = new int[gridSize][gridSize];

    while(in.hasNextLine()) {

        if(++i < 2) {

            in.nextLine();

            continue;

        }

        String currentLine = in.nextLine().split("\s+");

        for (int row = 0; row < gridSize; row++) {

            for (int column = 0; column < gridSize; column++) {

                 grid[row][column] = Integer.parseInt(currentLine[column]);

            }

        }

    }

    return grid;





}