While loop help needed

FileReader file = new FileReader(fileName);
BufferedReader MyFile = new BufferedReader(file);

String currentLine;

while((currentLine = MyFile.readLine()) != null) {
System.out.println(currentLine);
}

Tried using Scanner?

Here is an example text document i might want to include

blah blah balh blah blah

blah blah balh blah blah blah blah balh

blah blah balh blah blah

blah blah balh blah blah blah blah balh blah bla

blah blah balh blah blah

I have noticed that it all works if i use these lines which isn't in a while loop

String textline = null;
textline = MyFile.readLine();
System.out.println(textline);

but as soon as i put it in a while loop it throws up the error.
Here is the code which works witout the while loop

FileReader file = new FileReader(fileName);
BufferedReader MyFile = new BufferedReader(file);

Document myDoc = new Document(fileName);

String textline = null;
textline = MyFile.readLine();
System.out.println(textline);

myDoc.LetterCount(textline);

myDoc.VowelCount(textline);

MyFile.close();

Like masher said: have you tried to do this using the Scanner class? Your loop conditional would be while( myScan.hasNext() ) ... and will not return a NullPointerException.

This is what I'm trying to do:

I have an application where I ask the user for a filename.
After the user has entered a filename the information is passed to a class which reads the file and the application can then call the object to read the file.

I intend to put other objects in the class so I don't want to put it into the application.

Here is the code I have for the app

import java.io.*;

class AnalyseDocument
{
public static InputStreamReader input = new InputStreamReader(System.in);
public static BufferedReader keyboardInput = new BufferedReader(input);

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

System.out.print("Enter a filename: ");
fileName = keyboardInput.readLine();

//Open the requested file for reading
FileReader file = new FileReader(fileName);
BufferedReader MyFile = new BufferedReader(file);

//Create an instance of Document
Document myDoc = new Document(fileName);

//Call the readFile object
myDoc.readFile();

MyFile.close();
}
}

Here is the code for the class file

import java.io.*;

public class Document
{
String textline;
String MyFile;

//Constructor
public Document()
{
textline = MyFile;
}

//Method for reading in the file text
public void readFile()
{
while((textline = MyFile.readLine()) !=null)
System.out.println(textline);
}

//Other objects are to be placed here for use in the application
}

What of that code you posted do i put in the readFile object?

Do i just out this code in?

FileReader file = new FileReader("Test.java");
BufferedReader buffer = new BufferedReader(file);
String line;

while((line = buffer.readLine()) != null) {
System.out.println(line);