https://openjdk.java.net/projects/openjfx/javafx-base/: OpenJFX JavaFX
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public interface javafx.beans.Observable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javafx.beans.Observable
  super_class: java.lang.Object
{
  public abstract void addListener(javafx.beans.InvalidationListener);
    descriptor: (Ljavafx/beans/InvalidationListener;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
          Name  Flags
      listener  

  public abstract void removeListener(javafx.beans.InvalidationListener);
    descriptor: (Ljavafx/beans/InvalidationListener;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
          Name  Flags
      listener  
}
SourceFile: "Observable.java"