import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class IterFileWrapper implements Iterable <String> {

	private File file;

	public IterFileWrapper(String fileName) throws IOException {
		 this(new File(fileName));
	}

	public IterFileWrapper(File file) throws IOException {
		  if(!file.exists())
		       throw new FileNotFoundException( "File does not exist");
		  if(!file.isFile())
		       throw new IOException( "File is not of type 'file'");
		  else {
		  this.file = file;
		  }
	}

	public IterFileWrapperIterator iterator(){
		 try {
		     return new IterFileWrapperIterator(file);
		 } catch( IOException e ) {
		      e.printStackTrace();
		       return null;
		 }
    }

}

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class IterFileWrapperIterator implements Iterator<String> {
    private FileReader reader;
    private BufferedReader in = null;
    private String string = null;

    public IterFileWrapperIterator(File file) throws IOException {
        try {
            reader = new FileReader(file);
            in  = new BufferedReader(reader);
            string = in.readLine();
            if( string == null ) {
                in.close();
            }
        }
        catch( IOException ex ) {
        	ex.printStackTrace();
        }
    }

    @Override
    public boolean hasNext() {
        return string != null;
    }

    @Override
    public String next() throws NoSuchElementException {
        String returnString = string;
        try {
          if( string == null ) {
           throw new NoSuchElementException( "Next line is not available" );
          }
          else {
            string = in.readLine();
          }
        }
        catch( Exception ex )
        {
            throw new NoSuchElementException();
        }
        return returnString;
    }
}

import java.io.IOException;

public class IterFile {

	public static void main(String[] args) throws IOException {

		String filename = "src/IterFile.txt";

		for (String s : new IterFileWrapper(filename))
			System.out.println(s);

	}

}