How to copy data in text file into two-dimensional arrays?

Question

Greeting. Can somebody teach me how to copy the input file into two-dimensional arrays? I'm stuck in making a matrix with number ROWS and COLUMNS according to the data in "input.txt"
import java.io.*;
import java.util.*;
public class array
    public static void main (String[] args) throws FileNotFoundException
    { Scanner sc = new Scanner (new FileReader("input.txt"));
        PrintWriter outfile = new PrintWriter("output.txt");
    int[][]matrix = new int[ROWS][COLUMNS];
}my input.txt :
a,b,c
2,2,1
1,1,1
2,2,1
3,3,1
4,4,1
5,5,1
1,6,2
2,7,2
3,8,2
4,9,2
5,10,2

Answer 1

import java.io.*;
import java.util.*;
public class array {
    public static void main(String[] args) throws IOException {
        FileInputStream in = null;
        FileOutputStream out = null;
try {
    in = new FileInputStream("input.txt");
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String line = null;
    while ((line = reader.readLine()) != null) {
        String split[]=line.split(",");
catch (IOException x) {
    System.err.println(x);
} finally {
    if (in != null) in.close();
}}}What after this?