Why use JavaFX properties?

Question

Forgive my question if this may seem silly, but I'm curious. I am making a Java program that will have a GUI, and I am interested in the whole idea of ​​properties. Why use them when we can just add data to the class? For instance:

class myButton extends Button {

   private boolean booleanProperty = false;

   myButton(args...) {
      // Do something with the property
   }

   public void setProperty(boolean value) {
      this.booleanProperty = value;
   }

   public boolean getProperty() {
      return this.booleanProperty;
   }
}

Everything seems to work just fine for storing additional information about the custom button implementation. But what about:

class myButton extends Button {

   private SimpleBooleanProperty booleanProperty = new SimpleBooleanProperty(false);

   myButton(args...) {
      // Do something with the property
   }

   public void setProperty(boolean value) {
      this.booleanProperty.set(value);
   }

   public boolean getProperty() {
      return this.booleanProperty.get();
   }
}

The only real difference that I see (correct me if I'm wrong) is that you can attach listeners to property values, but I feel that there should be more than just that. Ideas?

Answer 1

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TextField tf = ...
Node container = ...
container.visibleProperty.bind(tf.textProperty.isNotEmpty());

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Answer 2

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public class UndoManager {
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    BooleanProperty canRedo = ...;

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Button toolbarUndo;
MenuButton contextMenuUndo;

:

menuUndo.disabledProperty().bind(undoManager.undoProperty()):
toolbarUndo.disabledProperty().bind(undoManager.undoProperty());
contextMenuUndo.disabledProperty().bind(undoManager.undoProperty());

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Answer 3

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BooleanProperty booleanProperty = new SimpleBooleanProperty();
booleanProperty.addListener(new ChangeListener<Boolean>() {

    @Override
    public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
        System.out.println("property changed form "+oldValue +" to "+newValue);
    }
});
booleanProperty.set(true);
booleanProperty.set(true);
booleanProperty.set(false);
booleanProperty.set(false);
booleanProperty.set(false);
booleanProperty.set(true);
booleanProperty.set(false);
booleanProperty.set(true);
booleanProperty.set(false);

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Answer 4

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Answer 5

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