Grafica Escudo del Ecuadro en Java

package DLOKMS;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.image.BufferedImage;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.BorderFactory;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class ejemplopanel {

        JFrame frame=new JFrame();

        JPanel paneluno=new JPanel();

        JPanel images=new JPanel();

        JPanel paneltres=new JPanel();

        public ejemplopanel() throws IOException{

                panel1();

                imagen();

                panel3();

                unirpaneles();

        }

        public void panel1(){

                paneluno= new JPanel();

                paneluno.setBorder(BorderFactory.createTitledBorder("DEBER"));

                JLabel label1=new JLabel("BANDERA DEL ECUADOR");

                label1.setFont(new java.awt.Font("BANDERA DEL ECUADOR", 0,25));

                paneluno.add(label1);

                paneluno.setBackground(Color.yellow);

        }

        public void imagen() throws IOException{

                BufferedImage imagen = ImageIO.read(this.getClass().getResource("/imagen/escudo.png"));

                JLabel icono = new JLabel(new ImageIcon(imagen));

                images.add(icono);

                images.setBackground(Color.BLUE);

        }

        public void panel3(){

                paneltres= new JPanel();

                paneltres.setBackground(Color.red);

        }

        public void unirpaneles(){

                frame= new JFrame("Ejemplo de Paneles ");

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