Problem in identifying the turn in the Game of Old

Question

I’m trying to implement the Game of Old in Java with Swing, but my counter that defines the moves, does not change, so always displays the same move:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

@SuppressWarnings("serial")
public class Velha extends JFrame implements ActionListener, MouseListener {

    private JPanel painel;
    private final int LARGURA = 480;
    private final int ALTURA = 320;
    private Rectangle rect[];
    private boolean colidiu = false;

    private int posX, posY;
    private Timer timer;

    private int contador;

    public Velha() {

        //Cria uma nova instancia da classe Rectangle;
        rect = new Rectangle[9];

        timer = new Timer(6, this);
        timer.start();
        contador = 0;

        painel = new JPanel() {

            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                desenhar(g);
            }

            public void desenhar(Graphics g) {

                Graphics2D g2d = (Graphics2D) g;
                g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2d.setColor(Color.WHITE);
                for(int linha = 0; linha < 3; linha++) {
                    for(int coluna = 0; coluna < 3; coluna++) {
                        int xWidth = (LARGURA / 3);
                        int yHeigth = (ALTURA / 3);
                        g2d.drawRect(xWidth * linha, yHeigth * coluna, xWidth, yHeigth);

                        rect[linha * 3 + coluna] = new Rectangle(xWidth * linha, yHeigth * coluna, xWidth, yHeigth);
                    }
                }
            }
        };

        painel.addMouseListener(this);
        painel.setBackground(Color.BLACK);
        painel.setPreferredSize(new Dimension(LARGURA, ALTURA));
        getContentPane().add(painel);
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if(colidiu) {

            Graphics grapichs = getGraphics();
            Graphics2D g2d = (Graphics2D) grapichs;
            g2d.setColor(Color.RED);

            if(contador % 2 == 0) {
                g2d.drawLine(posX - 10, posY - 15, posX + 40, posY + 60);
                g2d.drawLine(posX - 10, posY + 60, posX + 40, posY - 10);
                return;
            } else {
                g2d.drawOval(posX - 30, posY, 60, 60);
            }

            //Incrementa quantidade de jogadas;
            contador++;
        }
    }
    public static void main(String[] args) {
        new Velha().setVisible(true);
    }

    @Override
    public void mouseClicked(java.awt.event.MouseEvent e) {

        for(int i=0; i<9; i++) {
            Rectangle eClick = new Rectangle(e.getX(), e.getY(), (LARGURA / 3), (ALTURA / 3));
            if(rect[i].getBounds().intersects(eClick)) {
                System.out.println("Retangulo: " + (i + 1));
                colidiu = true; 
                posX = (int) rect[i].getCenterX();
                posY = (int) rect[i].getCenterY();
                break; 
            }
        }
    }

    @Override
    public void mouseEntered(java.awt.event.MouseEvent e) {}

    @Override
    public void mouseExited(java.awt.event.MouseEvent e) {}

    @Override
    public void mousePressed(java.awt.event.MouseEvent e) {}

    @Override
    public void mouseReleased(java.awt.event.MouseEvent e) {}
}

The problem would be in: if(contador % 2 == 0), but I can’t solve.

Answer 1

Here it worked just by changing the variable colidiu for false after there was a collision, the problem wasn’t even the counter:

@Override
public void actionPerformed(ActionEvent e) {

    if(colidiu) {

        Graphics grapichs = getGraphics();
        Graphics2D g2d = (Graphics2D) grapichs;
        g2d.setColor(Color.RED);

        if(contador % 2 == 0) {
            g2d.drawLine(posX - 10, posY - 15, posX + 40, posY + 60);
            g2d.drawLine(posX - 10, posY + 60, posX + 40, posY - 10);
        } else {
            g2d.drawOval(posX - 30, posY, 60, 60);
        }

        //Incrementa quantidade de jogadas;
        contador++;
        colidiu = false;
    }
}