Código de Java - JSpinner Anidados

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JSpinner;

import javax.swing.SpinnerNumberModel;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

public class Prueba extends JFrame {

	int valor=0;

	JLabel res=new JLabel();

	public  Prueba() {

		setSize(450,500);

		setLayout(null);

		setLocationRelativeTo(null);

		JLabel nombre=new JLabel();

		nombre = new JLabel();

		nombre.setBounds(50,20,100,20);

		nombre.setText("Prueba");

		nombre.setVisible(true);

		getContentPane().add(nombre);

		JSpinner spin1=new JSpinner(new SpinnerNumberModel(0, 0, 10, 1));

		spin1.setBounds(10,50,150,20);

		spin1.setVisible(true);

		getContentPane().add(spin1);

		JSpinner spin2=new JSpinner(new SpinnerNumberModel(0, 0, 20, 2));

		spin2.setBounds(10,100,150,20);

		spin2.setVisible(true);

		getContentPane().add(spin2);

		JSpinner spin5=new JSpinner(new SpinnerNumberModel(0, 0, 50, 5));

		spin5.setBounds(10,150,150,20);

		spin5.setVisible(true);

		getContentPane().add(spin5);

		JSpinner spin10=new JSpinner(new SpinnerNumberModel(0, 0, 100, 10));

		spin10.setBounds(10,200,150,20);

		spin10.setVisible(true);

		getContentPane().add(spin10);

		res = new JLabel();

		res.setBounds(50,300,100,20);

		res.setText(Integer.toString(valor));

		res.setVisible(true);

		getContentPane().add(res);

		spin1.addChangeListener(new ChangeListener() {

			@Override

			public void stateChanged(ChangeEvent arg0) {

				// TODO Auto-generated method stub

				valor+=1;

				//valor+=(int)(spin1.getValue());

				System.out.println(valor);

				res.setText(Integer.toString(valor));

			}});

		spin2.addChangeListener(new ChangeListener() {

			@Override

			public void stateChanged(ChangeEvent arg0) {

				// TODO Auto-generated method stub

				valor+=2;

				//valor+=(int)(spin2.getValue());

				System.out.println(valor);

				res.setText(Integer.toString(valor));

			}});

		spin5.addChangeListener(new ChangeListener() {

			@Override

			public void stateChanged(ChangeEvent arg0) {

				// TODO Auto-generated method stub

				valor+=5;

				//valor+=(int)(spin5.getValue());

				System.out.println(valor);

				res.setText(Integer.toString(valor));

			}});

		spin10.addChangeListener(new ChangeListener() {

			@Override

			public void stateChanged(ChangeEvent arg0) {

				// TODO Auto-generated method stub

				//valor+=(int)(spin10.getValue());

				valor+=10;

				System.out.println(valor);

				res.setText(Integer.toString(valor));

			}});

	}

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		new Prueba().setVisible(true);

	}

}