BELIEVE.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Read {

    // Scanner used for taking user input.
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        //
        // Process the user's input
        //
        String input = "";
        while (true) {
            System.out.print("Please enter a filename: ");
            input = scanner.nextLine();
            if (input.length() == 0) {
                System.out.println("Invalid file name.");
            } else {
                break;
            }
        }
        System.out.println("");
        //
        // Check if the file exists
        //
        File file = new File(input);
        if (!file.exists()) {
            System.out.println("File '" + input + "' does not exist.");
            return;
        }
        //
        // Read the file
        //
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader(file));
            String line;
            while ((line = reader.readLine()) != null) {
                // line has text
            }
        } catch (IOException ex) {
            System.out.println("Unable to read file.");
            return;
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    System.out.println("Unable to close file reader.");
                }
            }
        }
    }
}