Emplear la clase DecimalFormat para establecer la salida a dos decimales:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package ejercicio4;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
/**
*
* @author juan
*/
public class Conversion extends javax.swing.JFrame {
/**
* Creates new form Conversion
*/
public Conversion() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
txtEuros = new javax.swing.JTextField();
txtPesetas = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Conversor Euros <-> Pesetas");
txtEuros.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txtEurosActionPerformed(evt);
}
});
txtEuros.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
txtEurosKeyReleased(evt);
}
});
txtPesetas.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txtPesetasActionPerformed(evt);
}
});
txtPesetas.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
txtPesetasKeyReleased(evt);
}
});
jLabel1.setText("Euros:");
jLabel2.setText("Pesetas:");
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(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(txtEuros, javax.swing.GroupLayout.PREFERRED_SIZE, 142, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 58, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel2)
.addComponent(txtPesetas, javax.swing.GroupLayout.PREFERRED_SIZE, 164, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(57, 57, 57)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtEuros, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(txtPesetas, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(198, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void txtPesetasActionPerformed(java.awt.event.ActionEvent evt) {
convAEuros();
}
private void txtEurosActionPerformed(java.awt.event.ActionEvent evt) {
}
private void txtEurosKeyReleased(java.awt.event.KeyEvent evt) {
convAPesetas();
}
private void txtPesetasKeyReleased(java.awt.event.KeyEvent evt) {
convAEuros();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Conversion.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Conversion.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Conversion.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Conversion.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Conversion().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField txtEuros;
private javax.swing.JTextField txtPesetas;
// End of variables declaration
private void convAPesetas() {
double pesetas,euros;
DecimalFormat formato = new DecimalFormat("######.##");
if (!txtEuros.getText().equals(""))
try {
euros = Double.parseDouble(txtEuros.getText());
pesetas=euros*166.386;
txtPesetas.setText(formato.format(pesetas));
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "Los datos introducidos no se pueden convertir a moneda", "Error en la conversión", JOptionPane.ERROR_MESSAGE);
txtEuros.setText("");
txtEuros.requestFocus();
}
}
private void convAEuros() {
double pesetas,euros;
DecimalFormat formato = new DecimalFormat("######.##");
try {
pesetas = Double.parseDouble(txtPesetas.getText());
euros=pesetas/166.386;
txtEuros.setText(String.valueOf(formato.format(euros)));
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "Los datos introducidos no se pueden convertir a moneda", "Error en la conversión", JOptionPane.ERROR_MESSAGE);
txtPesetas.setText("");
txtPesetas.requestFocus();
}
}
}
No hay comentarios:
Publicar un comentario