How to verify fields inside a .txt file in Java?

Question

I have a .txt file which i want to read using Java and then verify if some particular fields is equal to a given string.

Now, i want to validate that if line/record starts with 03, then see of 7th index field is '0420'. Also, if its an empty field, then verify it.

public class ReadFile {
    public static List<String> lines;

    public static void main(String[] args) throws IOException {

        readFileIntoList("File1.txt");
        String s1 = lines.get(0).subString(0,7)
        if(s1.equals("0420")){
            sop(s1);
        }
    }

    public static List<String> readFileIntoList(String file) {
        lines = Collections.emptyList();
        try {
            lines = Files.readAllLines(Paths.get(file), StandardCharsets.UTF_8);
            for (String s : lines) {
                System.out.println(s);
            }
        } catch (IOException e) {
        }
        return lines;
    }
}

File1.txt

01,23434,34343,6335,1235533,345,,,42/
02,TEST23,2253434,1,2233,2233,,4/
03,TEST44,,1123,3434343,,,0420,3434,,,/
04,2343,24334,Test2,1600819,4802458,3201638,NOTE1,TEXT2,
66,MORE TEXT IN THIS LINE
04,2343443,24334,Test2,1600819,4802458,3201638,NOTE122,TEXT2,

Answer 1

public static void main(String[] args) throws IOException {
    String col_0 = "03";
    String col_7 = "0420";
    
    boolean matchedFound = false;
    
    List<String> readAllLines = readFileIntoList();
    for (int i = 0; i < readAllLines.size(); i++) {
        String[] splittedLine = readAllLines.get(i).split(",");
        if(splittedLine.length >= 7) {
            String firstWord = splittedLine[0];
            if(firstWord.equals(col_0)) {
                String seventhWord = splittedLine[7];
                if(seventhWord.equals(col_7)) {
                    matchedFound = true;
                    break;
                }
            }
        }
    }
    System.out.println(matchedFound);
}