การตรวจสอบความถูกต้องของข้อมูล

public class SimpleDataValidation {
    public static void main(String[] args) {
        try {
            // Read all lines from the file
            Path path = Paths.____("sample_market_data.csv");
            List lines = Files.____(path);
            
            // Check if the file is empty
            System.out.println("File is empty: " + ____.____());
            
            // Verify the header contains expected column names
            if (!lines.isEmpty()) {
                String firstLine = lines.get(0);
                System.out.println("First line: " + firstLine);
                System.out.println("Contains 'Date': " + firstLine.____("____"));
                System.out.println("Contains 'Ticker': " + firstLine.contains("____"));
                System.out.println("Total lines: " + lines.size());
            }
        } catch (IOException e) {
            System.err.println("Error reading file: " + e.getMessage());
        }
    }
}