GUI - tictactoe

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

public class GUI extends JFrame implements ActionListener {


    public GUI() {
        this.setBounds(0, 0,800, 800);
        this.setTitle("TicTacToe");
        FlowLayout f = new FlowLayout();
        this.setLayout(f);

        JLabel image = new JLabel("");
        image.setIcon(new ImageIcon("src/Tic-Tac-Toe.png")); //endre bildenavn og evt. plassering
        image.setLocation(0, 0);
        image.setSize(800, 800);
        this.add(image);


        JButton knapp = new JButton();
        knapp.addActionListener(this);

        //knapp 1
        knapp.setText("1 player");
        setVisible(true);
        this.add(knapp);
        knapp.addActionListener(this);
        knapp.setBounds(200, 300, 500, 500);


        //knapp 2
        JButton knapp2 = new JButton();
        knapp2.setText(" 2 player");
        this.add(knapp2);
        knapp2.addActionListener(this);
        knapp2.setBounds(200, 200, 500, 500);

        this.setVisible(true);


    }

    @Override
    public void actionPerformed(ActionEvent actionarg0) {

    }

    public static void main(String[] args) {
        GUI g = new GUI();
    }
}