Java PropertyChangeListener












10














I'm trying to figure out how to listen to a property change in another class. Below is my code:



ClassWithProperty has the property I want to listen to:



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline;

public int getUsersOnline() {
return usersOnline;
}

public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
}
}

public void addPropertyChangeListener(
PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(
PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}


Main is where i need to know about the property change:



public class Main {

private static ClassWithProperty test;

public static void main(String args) {
test = new ClassWithProperty();
test.addPropertyChangeListener(listen());

}

private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}

}


I have the event fired only the last time (usersOnline=10).
I'm new to Java and tried to find a solution, but to no avail.










share|improve this question
























  • Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
    – Markus Johnsson
    Feb 13 '11 at 22:56










  • Yes, my mistake,but the problem persists. Thank you ;)
    – Laphroaig
    Feb 13 '11 at 23:07










  • edited the mistake.
    – Laphroaig
    Feb 13 '11 at 23:23
















10














I'm trying to figure out how to listen to a property change in another class. Below is my code:



ClassWithProperty has the property I want to listen to:



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline;

public int getUsersOnline() {
return usersOnline;
}

public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
}
}

public void addPropertyChangeListener(
PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(
PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}


Main is where i need to know about the property change:



public class Main {

private static ClassWithProperty test;

public static void main(String args) {
test = new ClassWithProperty();
test.addPropertyChangeListener(listen());

}

private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}

}


I have the event fired only the last time (usersOnline=10).
I'm new to Java and tried to find a solution, but to no avail.










share|improve this question
























  • Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
    – Markus Johnsson
    Feb 13 '11 at 22:56










  • Yes, my mistake,but the problem persists. Thank you ;)
    – Laphroaig
    Feb 13 '11 at 23:07










  • edited the mistake.
    – Laphroaig
    Feb 13 '11 at 23:23














10












10








10


2





I'm trying to figure out how to listen to a property change in another class. Below is my code:



ClassWithProperty has the property I want to listen to:



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline;

public int getUsersOnline() {
return usersOnline;
}

public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
}
}

public void addPropertyChangeListener(
PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(
PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}


Main is where i need to know about the property change:



public class Main {

private static ClassWithProperty test;

public static void main(String args) {
test = new ClassWithProperty();
test.addPropertyChangeListener(listen());

}

private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}

}


I have the event fired only the last time (usersOnline=10).
I'm new to Java and tried to find a solution, but to no avail.










share|improve this question















I'm trying to figure out how to listen to a property change in another class. Below is my code:



ClassWithProperty has the property I want to listen to:



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline;

public int getUsersOnline() {
return usersOnline;
}

public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
}
}

public void addPropertyChangeListener(
PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(
PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}


Main is where i need to know about the property change:



public class Main {

private static ClassWithProperty test;

public static void main(String args) {
test = new ClassWithProperty();
test.addPropertyChangeListener(listen());

}

private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}

}


I have the event fired only the last time (usersOnline=10).
I'm new to Java and tried to find a solution, but to no avail.







java






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Apr 4 '17 at 14:26









gEdringer

6,3663923




6,3663923










asked Feb 13 '11 at 22:51









Laphroaig

25941025




25941025












  • Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
    – Markus Johnsson
    Feb 13 '11 at 22:56










  • Yes, my mistake,but the problem persists. Thank you ;)
    – Laphroaig
    Feb 13 '11 at 23:07










  • edited the mistake.
    – Laphroaig
    Feb 13 '11 at 23:23


















  • Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
    – Markus Johnsson
    Feb 13 '11 at 22:56










  • Yes, my mistake,but the problem persists. Thank you ;)
    – Laphroaig
    Feb 13 '11 at 23:07










  • edited the mistake.
    – Laphroaig
    Feb 13 '11 at 23:23
















Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
– Markus Johnsson
Feb 13 '11 at 22:56




Probably unrelated to your question, but one problem in your code is that you increase usersOnline twice each iteration of the loop. Use ++ only once.
– Markus Johnsson
Feb 13 '11 at 22:56












Yes, my mistake,but the problem persists. Thank you ;)
– Laphroaig
Feb 13 '11 at 23:07




Yes, my mistake,but the problem persists. Thank you ;)
– Laphroaig
Feb 13 '11 at 23:07












edited the mistake.
– Laphroaig
Feb 13 '11 at 23:23




edited the mistake.
– Laphroaig
Feb 13 '11 at 23:23












2 Answers
2






active

oldest

votes


















12














The code:



private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}


returns null which means "no object", which in turn means that test.addPropertyChangeListener(listen()) is effectively test.addPropertyChangeListener(null), which won't register anything.



You must pass a valid instance of a PropertyChangeListener to the addPropertyChangeListener() method.



Edit



I suggest you read the Java tutorial's chapter about PropertyChangeListeners:
http://download.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html



Another problem of your code is that you call firePropertyChange() in the constructor of ClassWithProperty. But at that time, no listener can possibly be registered, so it does not have any effect. Any call to addPropertyChangeListener() happens after you have fired the events.



Here is your code modified so that it should work (haven't tested it though...):



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline = 0;

public ClassWithProperty() {
}

public void setupOnlineUsers()
{
while (usersOnline < 10) {
changes.firePropertyChange("usersOnline", usersOnline, ++usersOnline);
}
}

public int getUsersOnline() {
return usersOnline;
}

public void addPropertyChangeListener(PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}

public void removePropertyChangeListener(PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}

public class MainListener implements PropertyChangeListener {
private ClassWithProperty test;

public MainListener() {
test = new ClassWithProperty();
test.addPropertyChangeListener(this);
test.setupOnlineUsers();
}

public void propertyChange(PropertyChangeEvent evt) {
System.out.println(test.getUsersOnline());
}

public static void main(String args) {
new MainListener(); // do everything in the constructor
}
}





share|improve this answer























  • Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
    – Laphroaig
    Feb 13 '11 at 23:45










  • Yes!! It work and now i can understand why!!! Thank you very much! ++++
    – Laphroaig
    Feb 14 '11 at 0:40



















0














Your method here:



public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
usersOnline++;
}
}


has a while loop that will continuously loop and block the thread. My limited knowledge of property change listeners is that they listen for changes to a bound property, here the usersOnLine variable, meaning the property change should only fire if this number changes (likely within in any setUserOnLine, addUserOnLine, removeUserOnLine and similar methods). For more on bound properties, please look here: Bound Properties






share|improve this answer























  • ok thank you again :) i have to learn about it.
    – Laphroaig
    Feb 13 '11 at 23:12










  • Your link to bound properties died, try this
    – Noumenon
    May 23 '13 at 11:45













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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

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active

oldest

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active

oldest

votes









12














The code:



private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}


returns null which means "no object", which in turn means that test.addPropertyChangeListener(listen()) is effectively test.addPropertyChangeListener(null), which won't register anything.



You must pass a valid instance of a PropertyChangeListener to the addPropertyChangeListener() method.



Edit



I suggest you read the Java tutorial's chapter about PropertyChangeListeners:
http://download.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html



Another problem of your code is that you call firePropertyChange() in the constructor of ClassWithProperty. But at that time, no listener can possibly be registered, so it does not have any effect. Any call to addPropertyChangeListener() happens after you have fired the events.



Here is your code modified so that it should work (haven't tested it though...):



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline = 0;

public ClassWithProperty() {
}

public void setupOnlineUsers()
{
while (usersOnline < 10) {
changes.firePropertyChange("usersOnline", usersOnline, ++usersOnline);
}
}

public int getUsersOnline() {
return usersOnline;
}

public void addPropertyChangeListener(PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}

public void removePropertyChangeListener(PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}

public class MainListener implements PropertyChangeListener {
private ClassWithProperty test;

public MainListener() {
test = new ClassWithProperty();
test.addPropertyChangeListener(this);
test.setupOnlineUsers();
}

public void propertyChange(PropertyChangeEvent evt) {
System.out.println(test.getUsersOnline());
}

public static void main(String args) {
new MainListener(); // do everything in the constructor
}
}





share|improve this answer























  • Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
    – Laphroaig
    Feb 13 '11 at 23:45










  • Yes!! It work and now i can understand why!!! Thank you very much! ++++
    – Laphroaig
    Feb 14 '11 at 0:40
















12














The code:



private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}


returns null which means "no object", which in turn means that test.addPropertyChangeListener(listen()) is effectively test.addPropertyChangeListener(null), which won't register anything.



You must pass a valid instance of a PropertyChangeListener to the addPropertyChangeListener() method.



Edit



I suggest you read the Java tutorial's chapter about PropertyChangeListeners:
http://download.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html



Another problem of your code is that you call firePropertyChange() in the constructor of ClassWithProperty. But at that time, no listener can possibly be registered, so it does not have any effect. Any call to addPropertyChangeListener() happens after you have fired the events.



Here is your code modified so that it should work (haven't tested it though...):



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline = 0;

public ClassWithProperty() {
}

public void setupOnlineUsers()
{
while (usersOnline < 10) {
changes.firePropertyChange("usersOnline", usersOnline, ++usersOnline);
}
}

public int getUsersOnline() {
return usersOnline;
}

public void addPropertyChangeListener(PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}

public void removePropertyChangeListener(PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}

public class MainListener implements PropertyChangeListener {
private ClassWithProperty test;

public MainListener() {
test = new ClassWithProperty();
test.addPropertyChangeListener(this);
test.setupOnlineUsers();
}

public void propertyChange(PropertyChangeEvent evt) {
System.out.println(test.getUsersOnline());
}

public static void main(String args) {
new MainListener(); // do everything in the constructor
}
}





share|improve this answer























  • Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
    – Laphroaig
    Feb 13 '11 at 23:45










  • Yes!! It work and now i can understand why!!! Thank you very much! ++++
    – Laphroaig
    Feb 14 '11 at 0:40














12












12








12






The code:



private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}


returns null which means "no object", which in turn means that test.addPropertyChangeListener(listen()) is effectively test.addPropertyChangeListener(null), which won't register anything.



You must pass a valid instance of a PropertyChangeListener to the addPropertyChangeListener() method.



Edit



I suggest you read the Java tutorial's chapter about PropertyChangeListeners:
http://download.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html



Another problem of your code is that you call firePropertyChange() in the constructor of ClassWithProperty. But at that time, no listener can possibly be registered, so it does not have any effect. Any call to addPropertyChangeListener() happens after you have fired the events.



Here is your code modified so that it should work (haven't tested it though...):



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline = 0;

public ClassWithProperty() {
}

public void setupOnlineUsers()
{
while (usersOnline < 10) {
changes.firePropertyChange("usersOnline", usersOnline, ++usersOnline);
}
}

public int getUsersOnline() {
return usersOnline;
}

public void addPropertyChangeListener(PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}

public void removePropertyChangeListener(PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}

public class MainListener implements PropertyChangeListener {
private ClassWithProperty test;

public MainListener() {
test = new ClassWithProperty();
test.addPropertyChangeListener(this);
test.setupOnlineUsers();
}

public void propertyChange(PropertyChangeEvent evt) {
System.out.println(test.getUsersOnline());
}

public static void main(String args) {
new MainListener(); // do everything in the constructor
}
}





share|improve this answer














The code:



private static PropertyChangeListener listen() {
System.out.println(test.getUsersOnline());
return null;
}


returns null which means "no object", which in turn means that test.addPropertyChangeListener(listen()) is effectively test.addPropertyChangeListener(null), which won't register anything.



You must pass a valid instance of a PropertyChangeListener to the addPropertyChangeListener() method.



Edit



I suggest you read the Java tutorial's chapter about PropertyChangeListeners:
http://download.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html



Another problem of your code is that you call firePropertyChange() in the constructor of ClassWithProperty. But at that time, no listener can possibly be registered, so it does not have any effect. Any call to addPropertyChangeListener() happens after you have fired the events.



Here is your code modified so that it should work (haven't tested it though...):



public class ClassWithProperty {
private PropertyChangeSupport changes = new PropertyChangeSupport(this);
private int usersOnline = 0;

public ClassWithProperty() {
}

public void setupOnlineUsers()
{
while (usersOnline < 10) {
changes.firePropertyChange("usersOnline", usersOnline, ++usersOnline);
}
}

public int getUsersOnline() {
return usersOnline;
}

public void addPropertyChangeListener(PropertyChangeListener l) {
changes.addPropertyChangeListener(l);
}

public void removePropertyChangeListener(PropertyChangeListener l) {
changes.removePropertyChangeListener(l);
}
}

public class MainListener implements PropertyChangeListener {
private ClassWithProperty test;

public MainListener() {
test = new ClassWithProperty();
test.addPropertyChangeListener(this);
test.setupOnlineUsers();
}

public void propertyChange(PropertyChangeEvent evt) {
System.out.println(test.getUsersOnline());
}

public static void main(String args) {
new MainListener(); // do everything in the constructor
}
}






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 11 at 22:09









LAD

1,8731720




1,8731720










answered Feb 13 '11 at 23:30









a_horse_with_no_name

291k46445539




291k46445539












  • Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
    – Laphroaig
    Feb 13 '11 at 23:45










  • Yes!! It work and now i can understand why!!! Thank you very much! ++++
    – Laphroaig
    Feb 14 '11 at 0:40


















  • Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
    – Laphroaig
    Feb 13 '11 at 23:45










  • Yes!! It work and now i can understand why!!! Thank you very much! ++++
    – Laphroaig
    Feb 14 '11 at 0:40
















Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
– Laphroaig
Feb 13 '11 at 23:45




Can you please integrate my code with an example? sorry but i'm a javabeginner and can't understand it. For me it's to hard to understand due to my poor english too (i'm from Italy). Thank you very much.
– Laphroaig
Feb 13 '11 at 23:45












Yes!! It work and now i can understand why!!! Thank you very much! ++++
– Laphroaig
Feb 14 '11 at 0:40




Yes!! It work and now i can understand why!!! Thank you very much! ++++
– Laphroaig
Feb 14 '11 at 0:40













0














Your method here:



public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
usersOnline++;
}
}


has a while loop that will continuously loop and block the thread. My limited knowledge of property change listeners is that they listen for changes to a bound property, here the usersOnLine variable, meaning the property change should only fire if this number changes (likely within in any setUserOnLine, addUserOnLine, removeUserOnLine and similar methods). For more on bound properties, please look here: Bound Properties






share|improve this answer























  • ok thank you again :) i have to learn about it.
    – Laphroaig
    Feb 13 '11 at 23:12










  • Your link to bound properties died, try this
    – Noumenon
    May 23 '13 at 11:45


















0














Your method here:



public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
usersOnline++;
}
}


has a while loop that will continuously loop and block the thread. My limited knowledge of property change listeners is that they listen for changes to a bound property, here the usersOnLine variable, meaning the property change should only fire if this number changes (likely within in any setUserOnLine, addUserOnLine, removeUserOnLine and similar methods). For more on bound properties, please look here: Bound Properties






share|improve this answer























  • ok thank you again :) i have to learn about it.
    – Laphroaig
    Feb 13 '11 at 23:12










  • Your link to bound properties died, try this
    – Noumenon
    May 23 '13 at 11:45
















0












0








0






Your method here:



public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
usersOnline++;
}
}


has a while loop that will continuously loop and block the thread. My limited knowledge of property change listeners is that they listen for changes to a bound property, here the usersOnLine variable, meaning the property change should only fire if this number changes (likely within in any setUserOnLine, addUserOnLine, removeUserOnLine and similar methods). For more on bound properties, please look here: Bound Properties






share|improve this answer














Your method here:



public ClassWithProperty() {
usersOnline = 0;
while (usersOnline<10) {
changes.firePropertyChange("usersOnline", usersOnline, usersOnline++);
usersOnline++;
}
}


has a while loop that will continuously loop and block the thread. My limited knowledge of property change listeners is that they listen for changes to a bound property, here the usersOnLine variable, meaning the property change should only fire if this number changes (likely within in any setUserOnLine, addUserOnLine, removeUserOnLine and similar methods). For more on bound properties, please look here: Bound Properties







share|improve this answer














share|improve this answer



share|improve this answer








edited Aug 29 '17 at 6:45









J Woodchuck

815922




815922










answered Feb 13 '11 at 22:58









Hovercraft Full Of Eels

261k20211317




261k20211317












  • ok thank you again :) i have to learn about it.
    – Laphroaig
    Feb 13 '11 at 23:12










  • Your link to bound properties died, try this
    – Noumenon
    May 23 '13 at 11:45




















  • ok thank you again :) i have to learn about it.
    – Laphroaig
    Feb 13 '11 at 23:12










  • Your link to bound properties died, try this
    – Noumenon
    May 23 '13 at 11:45


















ok thank you again :) i have to learn about it.
– Laphroaig
Feb 13 '11 at 23:12




ok thank you again :) i have to learn about it.
– Laphroaig
Feb 13 '11 at 23:12












Your link to bound properties died, try this
– Noumenon
May 23 '13 at 11:45






Your link to bound properties died, try this
– Noumenon
May 23 '13 at 11:45




















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