Reading contents of a file into a 2D array

Question

I am fairly new to programming so layman\'s talk is appreciated.

I have been tasked to read the contents of a file, which will contain 9 values (3x3 array) and then

Answer 1

ok, the way I look to it: you read the content of the input file to a string. You already have the method for reading line by line just put everything in a string.

String content = readFile(input.txt);

// Parse lines

String[] lines = content.split("\n");

// Parses values

for(int i = 0; i < lines.length; i++)  {
    // Get line values
    String[] values = lines[i].split(" ");
    for(int j = 0; j < values.length; j++) {
        // Punt in Matrix
        matrix[i][j] = Double.parseDouble(values[j]);
    }
}

Answer 2

You're missing an extra step here.

Once you read the line, you have to then split the line and parseDouble on individual numbers.

int lineCount = 0;
while ((line = bf.readLine()) != null)
{
    String[] numbers = line.split(" ");
    for ( int i = 0 ; i < 3 ; i++) 
         matrix[lineCount][i] = Double.parseDouble(numbers[i]);

    lineCount++;
}

Also, your readFile doesn't need to return anything. Just make your matrix variable global.