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Creating basic file readers

You're working as a data analyst at a startup that tracks industry trends. Your team receives CSV files daily with market data that needs to be processed. As the first step in building a data pipeline, you need to create a reliable way to read these files and verify their existence before processing.

The File, Path, Paths, and Files classes have been imported for you.

This exercise is part of the course

Importing Data in Java

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Exercise instructions

  • Create a File object using the file path.
  • Check if the file exists.
  • Get the file size in bytes.
  • Create a Path object from the file path.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

public class BasicFileReaders {
    public static void main(String[] args) {
        String filePath = "sample_market_data.csv";
        
        // Create a File object
        File file = new File(____);
        
        // Check if the file exists
        System.out.println("File exists: " + ____.____());
        
        // Get the file size in bytes
        System.out.println("Size: " + ____.____() + " bytes");
        
        try {
            // Create a Path object from the file path
            Path path = Paths.____(filePath);            
            List lines = Files.readAllLines(path);           
            System.out.println("Total lines: " + lines.size());
            System.out.println("Header: " + lines.get(0));
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        }
    }
}
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