Manejador

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

public class ManejadorBotoncitos implements ActionListener{

    private JProgressBar barrita;
    private int valor;

    public ManejadorBotoncitos(JProgressBar barrita){
    this.barrita = barrita;
    }

    public void actionPerformed(ActionEvent evento){
    if(evento.getActionCommand().equals("aumenta")){
        valor = barrita.getValue();
        valor += 10;
        if(valida(valor)){
        barrita.setValue(valor);
        }
    }else if(evento.getActionCommand().equals("disminuye")){
        valor = barrita.getValue();
        valor -= 10;
        if(valida(valor)){
        barrita.setValue(valor);
        }
    }

    }

    public Boolean valida(int valor){
    if(valor >= barrita.getMinimum() && valor <= barrita.getMaximum()){
        return true;
    }else {
        return false;
    }
    }
}