Swing delay between calls

Question

I'm trying to make a program that load 4 images, put it in 4 labels and change the icons of each label in the frame regarding the random number in the list, like if it was blinking the images. It need to blink each image in the order that is sorted in comecaJogo() but when I press the btnComecar in the actionPerformed all imagens seems to change at the same time:

Here is my logic class:

public class Logica {

    List<Integer> seqAlea = new ArrayList<Integer>();
    List<Integer> seqInsere = new ArrayList<Integer>();
    int placar = 0;
    boolean cabouGame = false;
    Random geraNumero = new Random();
    int numero;
    Timer timer = new Timer(1500,null);

    public void comecaJogo() {
        for (int i = 0; i < 4; i++) {
            numero = geraNumero.nextInt(4) + 1;
            seqAlea.add(numero);
        }
    }

    public void piscaImagen(ImageIcon img1, ImageIcon img1b, JLabel lbl) {
        timer.addActionListener(new ActionListener() {
            int count = 0;
            @Override               
            public void actionPerformed(ActionEvent evt) {
                if(lbl.getIcon() != img1){
                    lbl.setIcon(img1);
                } else {
                    lbl.setIcon(img1b);
                }
                count++;
                if(count == 2){
                    ((Timer)evt.getSource()).stop();
                }
            }
        });
        timer.setInitialDelay(1250);
        timer.start();
    }
}

In the frame:

public class Main extends JFrame implements ActionListener {

JLabel lblImg1 = new JLabel();
JButton btnImg1 = new JButton("Economize Energia");
final URL resource1 = getClass().getResource("/br/unip/IMGs/img1.jpg");
final URL resource1b = getClass().getResource("/br/unip/IMGs/img1_b.png");
ImageIcon img1 = new ImageIcon(resource1);
ImageIcon img1b = new ImageIcon(resource1b);

JButton btnImg2 = new JButton("Preserve o Meio Ambiente");
JLabel lblImg2 = new JLabel("");
final URL resource2 = getClass().getResource("/br/unip/IMGs/img2.jpg");
final URL resource2b = getClass().getResource("/br/unip/IMGs/img2_b.jpg");
ImageIcon img2 = new ImageIcon(resource2);
ImageIcon img2b = new ImageIcon(resource2b);

JButton btnImg3 = new JButton("N\u00E3o \u00E0 polui\u00E7\u00E3o!");
JLabel lblImg3 = new JLabel("");
final URL resource3 = getClass().getResource("/br/unip/IMGs/img3.jpg");
final URL resource3b = getClass().getResource("/br/unip/IMGs/img3_b.jpg");
ImageIcon img3 = new ImageIcon(resource3);
ImageIcon img3b = new ImageIcon(resource3b);

JButton btnImg4 = new JButton("Recicle!");
JLabel lblImg4 = new JLabel("");
final URL resource4 = getClass().getResource("/br/unip/IMGs/img4.jpg");
final URL resource4b = getClass().getResource("/br/unip/IMGs/img4_b.jpg");
ImageIcon img4 = new ImageIcon(resource4);
ImageIcon img4b = new ImageIcon(resource4b);

Logica jogo = new Logica();

JButton btnComecar = new JButton("Come\u00E7ar");

public static void main(String[] args) {
    Main window = new Main();
    window.setVisible(true);

}

public Main() {

    lblImg1.setIcon(img1b);
    lblImg1.setBounds(78, 48, 250, 200);
    add(lblImg1);

    btnImg1.setBounds(153, 259, 89, 23);
    btnImg1.addActionListener(this);
    add(btnImg1);

    setBounds(100, 100, 800, 600);
    setLayout(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    btnImg2.setBounds(456, 272, 186, 23);
    btnImg2.addActionListener(this);
    lblImg2.setIcon(img2b);
    lblImg2.setBounds(421, 61, 250, 200);
    add(btnImg2);
    add(lblImg2);

    btnImg3.setBounds(114, 525, 186, 23);
    btnImg3.addActionListener(this);
    lblImg3.setIcon(img3b);
    lblImg3.setBounds(78, 314, 250, 200);
    add(lblImg3);
    add(btnImg3);

    btnImg4.setBounds(456, 525, 186, 23);
    btnImg4.addActionListener(this);
    lblImg4.setIcon(img4b);
    lblImg4.setBounds(421, 314, 250, 200);
    add(lblImg4);
    add(btnImg4);

    btnComecar.setBounds(68, 14, 89, 23);
    btnComecar.addActionListener(this);
    add(btnComecar);
    }

public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    if (e.getSource().equals(btnImg1)) {
        jogo.piscaImagen(img1, img1b, lblImg1);
    } else if (e.getSource().equals(btnComecar)) {
        jogo.comecaJogo();
        System.out.println(jogo.seqAlea);
        for (int i = 0; i < jogo.seqAlea.size(); i++) {
            switch (jogo.seqAlea.get(i)) {
            case 1:
                System.out.println("Posição: " + i + " " + jogo.seqAlea.get(i));
                jogo.piscaImagen(img1, img1b, lblImg1);
                break;
            case 2:
                System.out.println("Posição: " + i + " " + jogo.seqAlea.get(i));
                jogo.piscaImagen(img2, img2b, lblImg2);
                break;
            case 3:
                System.out.println("Posição: " + i + " " + jogo.seqAlea.get(i));
                jogo.piscaImagen(img3, img3b, lblImg3);
                break;
            case 4:
                System.out.println("Posição: " + i + " " + jogo.seqAlea.get(i));
                jogo.piscaImagen(img4, img4b, lblImg4);
                break;
            }
        }
    }
}
}

Thanks for the help!

Answer 1

one at time, like a memory game :)

There are multitudes of ways this might work, for example...

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Main extends JFrame implements ActionListener {

    JButton btnImg1 = new JButton();
    JButton btnImg2 = new JButton();
    JButton btnImg3 = new JButton();
    JButton btnImg4 = new JButton();

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new Main();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public Main() {

        JPanel buttons = new JPanel(new GridLayout(2, 2)) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(200, 200);
            }
        };

        buttons.add(btnImg1);
        buttons.add(btnImg2);
        buttons.add(btnImg3);
        buttons.add(btnImg4);

        add(buttons);

        JButton play = new JButton("Play");
        add(play, BorderLayout.SOUTH);
        play.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        List<JButton> sequence = new ArrayList<>(Arrays.asList(new JButton[]{btnImg1, btnImg2, btnImg3, btnImg4}));
        Collections.shuffle(sequence);
        Timer timer = new Timer(1000, new ActionListener() {

            private JButton last;

            @Override
            public void actionPerformed(ActionEvent e) {
                if (last != null) {
                    last.setBackground(null);
                }
                if (!sequence.isEmpty()) {
                    JButton btn = sequence.remove(0);
                    btn.setBackground(Color.RED);
                    last = btn;
                } else {
                    ((Timer)e.getSource()).stop();
                }
            }
        });
        timer.setInitialDelay(0);
        timer.start();
    }
}

This just places all the buttons into a List, shuffles the list and then the Timer removes the first button from the List until all the buttons have been "flashed".

Now this is just using the button's backgroundColor, so you'd need to create a class which allows you to associate the JButton with "on" and "off" images, these would then be added to the List and the Timer executed in a similar manner as above