You don’t need 2D array to store the file content, a list of String[] arrays would do, e.g:
public List<String[]> readData() throws IOException {
int count = 0;
String file = "bank-Detail.txt";
List<String[]> content = new ArrayList<>();
try(BufferedReader br = new BufferedReader(new FileReader(file))) {
String line = "";
while ((line = br.readLine()) != null) {
content.add(line.split(","));
}
} catch (FileNotFoundException e) {
//Some error logging
}
return content;
}
Also, it’s good practice to declare the list locally and return it from the method rather than adding elements into a shared list (‘bank’) in your case.