This program reads the first line from a file.

ReadFirstLine.java

import java.util.Scanner;   // Needed for Scanner class
import java.io.*;           // Needed for File class

/**
   This program reads the first line from a file.
*/

public class ReadFirstLine
{
   public static void main(String[] args) throws IOException
   {
      // Create a Scanner object for keyboard input.
      Scanner keyboard = new Scanner(System.in);
      
      // Get the file name.
      System.out.print("Enter the name of a file: ");
      String filename = keyboard.nextLine();

      // Open the file.
      File file = new File(filename);
      Scanner inputFile = new Scanner(file);

      // Read the first line from the file.
      String line = inputFile.nextLine();
      
      // Display the line.
      System.out.println("The first line in the file is:");
      System.out.println(line);

      // Close the file.
      inputFile.close();
   }
}