Buttons do not appear in Windowbuilder and problems to stop adding button in an arrayList

Question

I’m having a problem:I can’t figure out the phrase that’s on the given button the moment that "color" is going through it. I wanted to know the phrase on the button when it changes color. another QUESTION: if I put this code piece inside the student class:

for (int i = 0; i < botoes.size(); i++) { 
System.out.println(botoes.get(i).getValor()); 
System.out.println(botoes.size());
 } 

In the addBotão method, of the class Alunocliente, I am not able to understand why the output is repeating values. I wonder why the output repeats the name of the buttons? Because it does not appear once and in this way: I DIDN’T UNDERSTAND; YOU CAN REPEAT; YOU CAN SPEAK MORE SLOWLY; I UNDERSTAND; NO; MORE OR LESS. Why? He repeats the names, the output is this way: I DID NOT UNDERSTAND; DID NOT UNDERSTAND (REPEATED), So on.

package;

import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class AlunoCliente extends JFrame {

private JPanel jPanel1;
private ArrayList<Botao> botoes = new ArrayList<>();
private ArrayList<BtnOp> opcoes = new ArrayList<>();

public AlunoCliente() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(1500, 800);

jPanel1 = new JPanel();
setContentPane(jPanel1);
jPanel1.setLayout(null);
jPanel1.setLayout(null);

// DO JEITO QUE ESTÁ AQUI NÃO APARECE NO WINDOWBUILDER
addBotao("frase1", 57, 569, 306, 41);
addBotao("frase2", 392, 627, 306, 41);
addBotao("frase3", 57, 627, 306, 41);
addBotao("frase4", 392, 569, 306, 41);

setVisible(true);
}

private void addBotao(String frase, int x, int y, int largura, int altura) {
Botao b = new Botao(frase, jPanel1);
b.getBotao().setBounds(x, y, largura, altura);
botoes.add(b);
jPanel1.add(b.getBotao());
 for (int i = 0; i < botoes.size(); i++) { 
System.out.println(botoes.get(i).getValor()); 
System.out.println(botoes.size());
 } 

}
public ArrayList<Botao> getBotoes() {
return botoes;
}
public ArrayList<BtnOp> getOpcoes() {
return opcoes;
}
}

package;

import javax.swing.JButton;
import javax.swing.JPanel;


public class Botao {
private JButton botao;
private String valor;
private JPanel painel;

public Botao(String frase, JPanel painel){
    this.painel = painel;
    this.botao = new JButton(frase);
    this.botao.setFont(new java.awt.Font("Arial", java.awt.Font.BOLD, 25));
    this.valor = frase;
}

public JButton getBotao() {
    return botao;
}
public String getValor() {
    return valor;
}
}

package;

import java.awt.Button;

public class BtnOp {
private Button btn;
private int op;

public BtnOp(Button btn, int op) {
    this.btn = btn;
    this.op = op;
}

public Button getBtn() {
    return btn;
}

public int getOp() {
    return op;
}
}

package control;

import visao.Botao;
import visao.BtnOp;

import java.awt.Button;
import java.awt.Color;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;

public class ControllerPainel extends Thread {

    private ArrayList<Botao> botoes = new ArrayList<>();
    private ArrayList<BtnOp> opcoes = new ArrayList<>();
    private int totalBotoes;
    private boolean piscou;

    public ControllerPainel(boolean piscou, ArrayList<Botao> botoes, ArrayList<BtnOp> op) {
        this.botoes = botoes;
        this.piscou = piscou;
        this.totalBotoes = this.botoes.size();
        this.opcoes = op;
    }

    @Override
    public void run() {
        super.run();

        // inicia a varredura dos botões
        for (int indice = 0; indice < this.totalBotoes; indice++) {
            this.limpaBotoes();
            this.limpaBtnOp();

            // Botão da vez
            JButton botao = botoes.get(indice).getBotao();
            // altera a cor do botão
            botao.setBackground(Color.YELLOW);

            try {
                // para no botão
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                Logger.getLogger(ControllerPainel.class.getName()).log(Level.SEVERE, null, ex);
            }

            // Verificação do último valor
            if (indice == (totalBotoes - 1)) {
                indice = -1;
            }
        }
    }

    /* ALTERANDO TODOS OS BOTÕES PARA PADRÃO */
    private void limpaBotoes() {
        for (int i = 0; i < totalBotoes; i++) {
            JButton b = botoes.get(i).getBotao();
            b.setBackground(Color.CYAN);
        }
    }

    // limpa os botões de opções
    private void limpaBtnOp() {
        for (int i = 0; i < opcoes.size(); i++) {
            Button b = opcoes.get(i).getBtn();
            b.setBackground(new Color(32, 185, 232));
        }
    }

}

package control;

import visao.AlunoCliente;

public class ControleAlunoCliente {

private AlunoCliente ac;
private ControllerPainel painelController;
private boolean piscou;

public ControleAlunoCliente(AlunoCliente ac) {
    this.ac = ac;

    this.painelController = new ControllerPainel(piscou, this.ac.getBotoes(), ac.getOpcoes());
    this.painelController.start();
}

public static void main(String[] args) {
    ControleAlunoCliente c = new ControleAlunoCliente(new AlunoCliente());
}
}