File Reading Explanation

[GraemeH]

Hello Everyone,

i'm having problems understanding the following section of code:

int returnVal = fc.showOpenDialog(FileChooser.this); //...then open the file chooser box.
            if (returnVal == JFileChooser.APPROVE_OPTION)
            {
            	File file = fc.getSelectedFile(); //Get the file selected by the user.
                
                FileInputStream fis = null;
                BufferedInputStream bis = null;
                DataInputStream dis = null;
                
                try
                {
                	fis = new FileInputStream(file);
                	
                	bis = new BufferedInputStream(fis);
                	dis = new DataInputStream(bis);

would anybody be able to explain this to me please?

So far i've got that it reads the file line by line in the form of DataInputStream. But why are the FileInputStream and BufferedInputStream needed?

[Eranga]

First of all, do you know the difference of the following.

1. FileInputStream
2. BufferedInputStream
3. DataInputStream

Just read about those things first of all, then you can find the solution. Read carefully about the usage of each.

[Eranga]

That's really nice. So what's the point you mess-up with, if you have any on that?