Probléme java

ne marche, voila mon programme:

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.*;
import java.sql.*;
import java.awt.*;
import java.io.*;
import java.awt.event.*;


public class FileInput extends JFrame {
FileInput(){
setLayout(null);
TextArea t2 = new TextArea("debut",800,800);
File file = new File("C:\\oui.txt");
FileInputStream fis = null;
BufferedInputStream bis = null;
DataInputStream dis = null;
t2.setBounds(10,10,200,200);
add(t2) ;
setVisible(true);
setSize(800,800);

try {
fis = new FileInputStream(file);

// Here BufferedInputStream is added for fast reading.
bis = new BufferedInputStream(fis);
dis = new DataInputStream(bis);

// dis.available() returns 0 if the file does not have more lines.
while (dis.available() != 0) {

// this statement reads the line from the file and print it to
// the console.

// System.out.println(dis.readLine());
t2.append( dis.readString());
}

// dispose all the resources after using them.
fis.close();
bis.close();
dis.close();

} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
new FileInput();
}
}