Dinero

package dinero;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

public class Dinero extends JFrame implements ActionListener{

       private JButton dolar;
       private JButton real;
       private JButton euro;
       private JTextField jd;
       private JTextField jf;
       private JLabel titulo;

       public Dinero(){

           setLayout(new FlowLayout(FlowLayout.CENTER,10,20));
           titulo=new JLabel("CONVERSION DE MONEDAS (DE PESO CHILENO A REAL, DOLAR Y EURO)");
           dolar=new JButton("Dolar");
           euro=new JButton("Euro");
           real=new JButton("Real");
           jd=new JTextField(50);
           jf=new JTextField(50);
           add(titulo);
           add(jd);
           euro.addActionListener(this);
           dolar.addActionListener(this);
           real.addActionListener(this);
           add(euro);
           add(dolar);
           add(real);
           add(jf);

           setVisible(true);
           setSize(600,300);
           setDefaultCloseOperation(EXIT_ON_CLOSE);

     }

       @Override
       public void actionPerformed(ActionEvent e){

           float ex=0,ff=0,mEuro=752,mDolar=672,mReal=205;
           DecimalFormat df=new DecimalFormat("0.00");

           try{
              if(e.getSource()==euro){
                 ff=Float.parseFloat(jd.getText());
                 ex=ff/mEuro;
                 jf.setText(String.valueOf(df.format(ex)));
              }

              if(e.getSource()==dolar){
                 ff=Float.parseFloat(jd.getText());
                 ex=ff/mDolar;
                 jf.setText(String.valueOf(df.format(ex)));
              }

              if(e.getSource()==real){
                 ff=Float.parseFloat(jd.getText());
                 ex=ff/mReal;
                 jf.setText(String.valueOf(df.format(ex)));

              }

           }catch(NumberFormatException nfe){
                  jd.setText("");
                  jf.setText("");
                  JOptionPane.showMessageDialog(null,"El valor ingresado no es un numero entero","Error",JOptionPane.ERROR_MESSAGE);
                      }
       }




    public static void main(String[] args) {
           Dinero d=new Dinero();
    }

}