java

import javax.swing.JFrame;
import javax.swing.JLabel;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;


public class Window extends JFrame implements ActionListener {

    JButton button1, button2, button3, button4, button5, button6, button7, button8, button9;
    JLabel label;

    public Window() {
        setSize(420,400);
        setTitle("Tic Tac Toe");
        setLayout(null);

        label = new JLabel("Please choice your position!");
        label.setBounds(150,2,200,50);
        add(label);

        button1 = new JButton("HERE");
        button1.setBounds(50,50,80,80);
        button1.addActionListener(this);
        add(button1);

        button2 = new JButton("HERE");
        button2.setBounds(150,50,80,80);
        add(button2);

        button3 = new JButton("HERE");
        button3.setBounds(250,50,80,80);
        add(button3);

        button4 = new JButton("HERE");
        button4.setBounds(50,150,80,80);
        add(button4);

        button5 = new JButton("HERE");
        button5.setBounds(150,150,80,80);
        add(button5);

        button6 = new JButton("HERE");
        button6.setBounds(250,150,80,80);
        add(button6);

        button7 = new JButton("HERE");
        button7.setBounds(50,250,80,80);
        add(button7);

        button8 = new JButton("HERE");
        button8.setBounds(150,250,80,80);
        add(button8);

        button9 = new JButton("HERE");
        button9.setBounds(250,250,80,80);
        add(button9);

    }

    @Override
    public void actionPerformed(ActionEvent e) {

        Object source = e.getSource();

        if(source == button1) {
            if(TicTacToe.addCharacterUser(1,1)) {
                button1.setForeground(Color.RED);
            } else {
                label.setText("This position is occupied!");
            }
        }

    }

}