Example: Read File with Scanner in Java

// Read File with Scanner
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        String fileName = "sample.txt"; // Ensure this file exists in the same directory

        // Step 1: Use try-with-resources to ensure the Scanner is closed automatically
        try (Scanner scanner = new Scanner(new File(fileName))) {
            // Step 2: Loop while there are more lines to read
            while (scanner.hasNextLine()) {
                // Step 3: Read the next line and print it to the console
                System.out.println(scanner.nextLine());
            }
        } catch (FileNotFoundException e) {
            // Step 4: Handle the case where the file does not exist
            System.err.println("Error: The file '" + fileName + "' was not found. " + e.getMessage());
        }
    }
}