How to properly use the SimpleSetProprty?
Hi all,
I'm trying to use a SimpleSetProperty. As I understand yu documentation are supposed to be able to add an Eleent in this well, but I still get an Exception
[code]
Exception in the init of Application method
Exception in thread "main" java.lang.RuntimeException: Exception in the init of Application method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:398)
to com.sun.javafx.application.LauncherImpl.access$ 000 (LauncherImpl.java:47)
to com.sun.javafx.application.LauncherImpl$ 1.run(LauncherImpl.java:115)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractCollection.add(AbstractCollection.java:252)
at javafx.beans.binding.SetExpression.add(SetExpression.java:292)
to de.cmk.jfx.Test2$ NamedPolygon.addReachable (Test2.java:235)
at de.cmk.jfx.Test2.figureOutNeighbourhoods(Test2.java:162)
at de.cmk.jfx.Test2.loadContentFromYaml(Test2.java:95)
at de.cmk.jfx.Test2.init(Test2.java:40)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:296)
... 3 more
[/ code]
I googled for but was not able to find examples with SimpleSetProperty.
can someone give me a sample of work so I could win a clue what I'm doing wrong?
Thaks a lot in advance and best regards
Malta
Yes, these builders are a bit confusing. Note that this applies to all classes of SimpleXXXProperty:
The idea is that, for most uses, the property will be part of an object (or bean). That is, you'll have something like:
public class MyBean {
private SetProperty mySet ;
// ...
public final SetProperty mySetProperty() {
return mySet ;
}
public final ObservableSet getMySet() {
return mySet.get();
}
public final void setMySet(ObservableSet mySet) {
this.mySet.set(mySet);
}
}
So in this case the SetProperty belongs to an object of type MyBean and the "RIGHT" property name So that the reflection to play well with this property (i.e. for the library code to correctly find the methods mySetProperty, getMySet and setMySet), it must be initialized with a reference to its "bean owner" and his name. SimpleSetProperty (Object, String) constructor is designed to do this:
public class MyBean {
private SetProperty mySet = new SimpleSetProperty<>(this, "mySet");
// ...
}
In other words, the first argument to the constructor is not a reference to the wrapped set.
If you need something like
SetPropertysetProperty2 = new SimpleSetProperty<>(this, "lala", hset);
(even though I think you will spend in an ObservableSet
SetProperty
Tags: Java
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