https://openjdk.java.net/projects/openjfx/javafx-base/: OpenJFX JavaFX
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public interface javafx.collections.ObservableSet<E> extends java.util.Set<E>, javafx.beans.Observable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javafx.collections.ObservableSet
  super_class: java.lang.Object
{
  public abstract void addListener(javafx.collections.SetChangeListener<? super E>);
    descriptor: (Ljavafx/collections/SetChangeListener;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljavafx/collections/SetChangeListener<-TE;>;)V
    MethodParameters:
          Name  Flags
      listener  

  public abstract void removeListener(javafx.collections.SetChangeListener<? super E>);
    descriptor: (Ljavafx/collections/SetChangeListener;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljavafx/collections/SetChangeListener<-TE;>;)V
    MethodParameters:
          Name  Flags
      listener  
}
Signature: <E:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Set<TE;>;Ljavafx/beans/Observable;
SourceFile: "ObservableSet.java"