import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
 
/** Not really a good descriptive class name, but I don't know 
 *  what you're planning to do with it. You can pick a better one.
 */
public class FileProcessor {
 
    private Scanner filescan = null;
 
    /** Create an instance of FileProcessor for the given File. */
    public FileProcessor(File targetFile) throws FileNotFoundException {
        filescan = new Scanner(targetFile);
    }
 
    /** Processing operations are carried out by calling 
     *   public methods on an instance of this class.
     */
    public void printFile() throws IOException {
        while (filescan.hasNextInt()) {
            System.out.println(filescan.nextInt());
        }
    }
 
    /** main() can be used as a "driver" to manipulate an instance 
     *   of this class. It should not do anything directly with the internal 
     *   variables. All operations should be accessed only through 
     *   methods provided by the class.
     */
    public static void main(String[] args) {
        File targetFile = new File("t.txt");
        try {
            FileProcessor fileProcessor = new FileProcessor(targetFile);
            fileProcessor.printFile();
        } catch (FileNotFoundException fnf) {
            System.out.println("Target file: " + targetFile + " not found.");
            System.exit(1);
        } catch (IOException ex) {
            System.out.println("An IO error occurred processing this file");
            ex.printStackTrace();
            System.exit(1);
        }
    }
 
}