XOButton

package game;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class XOButton extends JButton{
    ImageIcon X,O;
    byte value = 0;

    public XOButton(){
        X = new ImageIcon(this.getClass().getResource("X.png"));
        O = new ImageIcon(this.getClass().getResource("O.png"));
        this.addActionListener((ActionListener) this);
    }

    public void actionPerformed(ActionEvent e){
        value++;
        value%=3;
        switch(value){
            case 0:
                setIcon(null);
                break;
            case 1:
                setIcon(X);
                break;
            case 2:
                setIcon(O);
                break;
        }
    }
}