Como Cambiar La Imagen De Un jButton En Java

package cambiarimagen;


public class CambiarImagen{
    
    public static void main(String[] args) {
        
        vista vi = new vista(); //creacion del objeto para el manejo de la vista en el controlador
        controla con = new controla(vi); //creacion del objeto del controlador, se pasa el anterior objeto al constructor
        con.eventos(); //invocacion para el uso de los eventos de la vista
        
    }

}

package cambiarimagen;


public class vista extends javax.swing.JFrame {

    public vista() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    //                           
    private void initComponents() {

        jb1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jb1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/img/diente.png"))); // NOI18N
        jb1.setFocusPainted(false);
        jb1.setFocusable(false);
        jb1.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        jb1.setPreferredSize(new java.awt.Dimension(73, 81));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(107, 107, 107)
                .addComponent(jb1, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(220, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(113, 113, 113)
                .addComponent(jb1, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(114, Short.MAX_VALUE))
        );

        pack();
    }//                         


    // Variables declaration - do not modify                     
    public javax.swing.JButton jb1;
    // End of variables declaration                   
}

package cambiarimagen;

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

public class controla implements ActionListener {
    
    private vista v;
    
    public controla(vista t){
        
        this.v = t;        
        this.v.setVisible(true);
    }
    
    public void eventos(){
        this.v.jb1.addActionListener(this);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==this.v.jb1){
            ImageIcon imagen = new ImageIcon("src/img/dienteVerde.png");
            this.v.jb1.setIcon(imagen);
        }
    }
    
}