import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

public class TextFileParser {

public static void main(String[] args) {

if (args.length != 1) {

System.out.println("Usage: java TextFileParser <filename>");

return;

}

String filename = args[0];

List<String> lines = parseFile(filename);

if (lines != null) {

System.out.println("File parsed successfully.");

//Example: Print the first 10 lines

int count = 0;

for (String line : lines) {

System.out.println(line);

count++;

if(count >= 10) break;

}

} else {

System.err.println("Error parsing file: " + filename);

}

}

public static List<String> parseFile(String filename) {

List<String> lines = new ArrayList<>();

try (BufferedReader reader = new BufferedReader(new FileReader(filename))) {

String line;

while ((line = reader.readLine()) != null) {

lines.add(line);

}

} catch (IOException e) {

System.err.println("IOException: " + e.getMessage());

return null; // Indicate an error

}

//Sanity checks

if(lines.isEmpty()){

System.out.println("File is empty.");

return lines; //Return empty list, but don't error

}

//Basic sanity check: Check if lines are not empty

for (String line : lines) {

if (line.trim().isEmpty()) {

System.out.println("Warning: Empty line found: " + line);

}

}

return lines;

}

}