I have a problem when trying to create an event in java if I use custom component properties. I created a digital clock and I have an alarm which I would like to throw an event but when I run my program, it doesn't because of an exception:
Exception in thread "Timer-0" java.lang.NullPointerException
at proyectoreloj.ProyectoReloj$1.run(ProyectoReloj.java:73)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
My code is:
public class ProyectoReloj extends JLabel implements Serializable
{
int hora, minutos;
boolean formato24h = false;
private Alarma alarma;
private AlarmaInterfaz alarmaInterfaz;
public ProyectoReloj()
{}
public Alarma getAlarma() {
return alarma;
}
public void setAlarma(Alarma alarma) {
this.alarma = alarma;
}
public boolean isFormato24h() {
return formato24h;
}
public void setFormato24h(boolean formato24h) {
this.formato24h = formato24h;
}
public void setAlarmaInterfaz(AlarmaInterfaz alarmaInterfaz) {
this.alarmaInterfaz = alarmaInterfaz;
}
public void start()
{
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
@Override
public void run()
{
Calendar calendario = Calendar.getInstance();
hora = Calendar.HOUR;
minutos = Calendar.MINUTES;
if(formato24h == false)
{
SimpleDateFormat formato = new SimpleDateFormat("hh:mm:ss");
setText(formato.format(calendario.getTime()));
}
else
{
SimpleDateFormat formato = new SimpleDateFormat("HH:mm:ss");
setText(formato.format(calendario.getTime()));
}
if((hora == getAlarma().getHora()) && (minutos == getAlarma().getMinutos()))
{
alarmaInterfaz.ejecutaAlarma();
}
}
},0,1000);
}
}
public class Alarma implements Serializable
{
private int hora = 8;
private int minutos = 26;
public int getHora() {
return hora;
}
public int getMinutos() {
return minutos;
}
public Alarma(int hora, int minutos)
{
this.hora = hora;
this.minutos = minutos;
}
}
public interface AlarmaInterfaz
{
void ejecutaAlarma();
}
public class AlarmaPanel extends javax.swing.JPanel {
/**
* Creates new form AlarmaPanel
*/
public AlarmaPanel() {
initComponents();
}
public Alarma getAlarm()
{
if(!horasField.getText().equalsIgnoreCase("") && minutosField.getText().equalsIgnoreCase(""))
{
int horas = Integer.parseInt(horasField.getText());
int minutos = Integer.parseInt(minutosField.getText());
return new Alarma(horas, minutos);
}
return null;
}
/**
* 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() {
horasField = new javax.swing.JTextField();
minutosField = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
horasField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
horasFieldActionPerformed(evt);
}
});
jLabel1.setText(":");
jLabel2.setText("ALARMA");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(horasField, javax.swing.GroupLayout.PREFERRED_SIZE, 21, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(minutosField, javax.swing.GroupLayout.PREFERRED_SIZE, 21, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(55, 55, 55))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(horasField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(minutosField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
}// </editor-fold>
private void horasFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
// Variables declaration - do not modify
private javax.swing.JTextField horasField;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField minutosField;
// End of variables declaration
}
public class RelojPropertyEditorSupport extends PropertyEditorSupport
{
private AlarmaPanel alarmaPanel = new AlarmaPanel();
@Override
public boolean supportsCustomEditor()
{
return true;
}
@Override
public Component getCustomEditor()
{
return alarmaPanel;
}
@Override
public Object getValue()
{
return alarmaPanel.getAlarm();
}
@Override
public String getJavaInitializationString()
{
int horas = alarmaPanel.getAlarm().getHora();
int minutos = alarmaPanel.getAlarm().getMinutos();
return "new proyectoreloj.Alarma("+horas+","+ minutos+")";
}
}
The following class is where I check my component
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package relojprueba;
import proyectoreloj.AlarmaInterfaz;
/**
*
* @author Amaro
*/
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
proyectoReloj2.start();
proyectoReloj2.setAlarmaInterfaz(new AlarmaInterfaz()
{
@Override
public void ejecutaAlarma()
{
System.out.println("Esto es la alarma");
}
});
}
/**
* 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() {
proyectoReloj1 = new proyectoreloj.ProyectoReloj();
proyectoReloj2 = new proyectoreloj.ProyectoReloj();
proyectoReloj1.setText("proyectoReloj1");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
proyectoReloj2.setText("proyectoReloj2");
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(149, 149, 149)
.addComponent(proyectoReloj2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(178, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(131, 131, 131)
.addComponent(proyectoReloj2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(155, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private proyectoreloj.ProyectoReloj proyectoReloj1;
private proyectoreloj.ProyectoReloj proyectoReloj2;
// End of variables declaration
}
