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

public class FileReadChars {
   public static void main(String[] args) {
      Scanner scnr = new Scanner(System.in);
      FileReader fileReader = null;     // FileReader for reading chars
      String fileName;                  // User defined file name
      int charRead;                     // Data read from file

      charRead = 0;

      // Get file name from user
      System.out.print("Enter a valid file name: ");
      fileName = scnr.next();

      try {
         // Prompt user for input
         System.out.println("Opening file " + fileName + ".");
         fileReader = new FileReader(fileName); // May throw FileNotFoundException

         // Use file input stream
         System.out.print("Reading character values: ");
         while (charRead != -1) {             // -1 means end of file has been reached
            charRead = fileReader.read(); // May throw IOException
            System.out.print(charRead + " ");
         }
      } catch (IOException excpt) {
         System.out.println("Caught IOException: " + excpt.getMessage());
      }

      // Done with file, so try to close it
      try {
         if (fileReader != null) {
            System.out.println("\nClosing file " + fileName + ".");
         }
      } catch (IOException excpt) {
         System.out.println("Caught IOException: " + excpt.getMessage());
      }
      fileReader.close(); // close() may throw IOException if fails
   }
}