enable users to enter names

this is the code for tic tac toe game, i want users can save their name as player X and player O, but I do not know how? can you give me some tips?




package threeTsGame;

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

public class TicTacToe implements ActionListener {

private int[][] winCombinations = new int[][] {
{0, 1, 2}, {3, 4, 5}, {6, 7, 8},
{0, 3, 6}, {1, 4, 7}, {2, 5, 8},
{0, 4, 8}, {2, 4, 6}
};
private JFrame window = new JFrame("Tic-Tac-Toe");
private JButton buttons[] = new JButton[9];
private int count, xWins, oWins = 0;
private String letter = "";
private boolean win = false;


public TicTacToe(){

window.setSize(300,300);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new GridLayout(3,3));
window.setLocationRelativeTo(null);


for(int i=0; i<=8; i++){
buttons[i] = new JButton();
window.add(buttons[i]);
buttons[i].addActionListener(this);
}

window.setVisible(true);

}


public void actionPerformed(ActionEvent a) {
count++;

if(count % 2 == 0){
letter = "O";
} else {
letter = "X";
}


JButton pressedButton = (JButton)a.getSource();
pressedButton.setText(letter);
pressedButton.setEnabled(false);


for(int i=0; i<=7; i++){
if( buttons[winCombinations[i][0]].getText().equals(buttons[winCombinations[i][1]].getText()) &&
buttons[winCombinations[i][1]].getText().equals(buttons[winCombinations[i][2]].getText()) &&
buttons[winCombinations[i][0]].getText() != ""){
win = true;
}
}


if(win == true){
if (count % 2 == 0){
JOptionPane.showMessageDialog(null, "Player O WINS the game!");
playAgainDialog();
}else
JOptionPane.showMessageDialog(null, "Player X WINS the game!");
playAgainDialog();
} else if(count == 9 && win == false){
JOptionPane.showMessageDialog(null, "The game was tie!");
playAgainDialog();
}
}

public void playAgainDialog() {
if(letter.equals("X")) xWins++;
else oWins++;

int response = JOptionPane.showConfirmDialog(null, "Do you want to play again?","Confirm", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

if(response == JOptionPane.YES_OPTION) reset();
else window.hide();
}

public void reset() {
for (int i=0; i<=8; i++){
buttons[i].setText("");
buttons[i].setEnabled(true);
}
win = false;
count = 0;
}

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