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import java.util.Observable;
import java.util.Observer;
import java.util.logging.Level;
import java.util.logging.Logger;
public class FrmContador extends javax.swing.JFrame implements Observer{
public FrmContador() {
initComponents();
}@SuppressWarnings("unchecked")
private void initComponents() {
lblCronometro = new javax.swing.JLabel();
btnIniciar = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Reloj digital");
lblCronometro.setFont(new java.awt.Font("Tahoma", 1, 48)); // NOI18N
btnIniciar.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
btnIniciar.setText("Iniciar");
btnIniciar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnIniciarActionPerformed(evt);
}});
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(22, 22, 22)
.addComponent(lblCronometro, javax.swing.GroupLayout.PREFERRED_SIZE, 246, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
.addContainerGap())
);layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblCronometro, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 129, Short.MAX_VALUE))
.addContainerGap())
);pack();
}private void btnIniciarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnIniciarActionPerformed
this.btnIniciar.setEnabled(false);
RelojDigital r = new RelojDigital(23, 59, 50);
r.addObserver(this);
Thread t = new Thread(r);
t.start();
} /**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
/* 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(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} /* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new FrmContador().setVisible(true);
}});
}private javax.swing.JButton btnIniciar;
private javax.swing.JLabel lblCronometro;
@Override
public void update(Observable o, Object arg) {
lblCronometro.setText((String) arg);
}}class RelojDigital extends Observable implements Runnable {private int horas, minutos, segundos;
public RelojDigital(int horas, int minutos, int segundos) {
this.horas = horas;
this.minutos = minutos;
this.segundos = segundos;
}@Override
public void run() {
String tiempo;
try {while (true) {
tiempo = "";
if (horas < 10) {
tiempo += "0" + horas;
} else {
tiempo += horas;
}tiempo += ":";
if (minutos < 10) {
tiempo += "0" + minutos;
} else {
tiempo += minutos;
}tiempo += ":";
if (segundos < 10) {
tiempo += "0" + segundos;
} else {
tiempo += segundos;
}this.setChanged();
this.notifyObservers(tiempo);
this.clearChanged();
Thread.sleep(1000);
segundos++;
if (segundos == 60) {
minutos++;
segundos = 0;if (minutos == 60) {
minutos = 0;horas++;
if (horas == 24) {
horas = 0; } } } }} catch (InterruptedException ex) {
Logger.getLogger(RelojDigital.class.getName()).log(Level.SEVERE, null, ex);
} }}
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