[JAVA]Swing creare una Stringa dinamica

[energie]

si scusa ti avevo postato il vecchio codice:

import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class lol {

static JFrame j = new JFrame();



public static void main( String arg[] )
{
j.setTitle("Xyz");
j.setBounds(10,10,300,200);
j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
j.setVisible(true);
j.getContentPane().add(label);

tCounter myCounter = new tCounter();
myCounter.run();

}

class tCounter extends Thread {

label = new JLabel();

public int count = 1;

public void run() {
while (count < 50) {
try {
sleep(1000);
} catch (InterruptedException e) { }

label.setText(String.valueOf(count));
count++;

}

}
}

}

questo è quello modificato completo ma da lo stesso errore