https://openjdk.java.net/projects/openjfx/javafx-base/: OpenJFX JavaFX
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public interface javafx.beans.value.ObservableBooleanValue extends javafx.beans.value.ObservableValue<java.lang.Boolean>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javafx.beans.value.ObservableBooleanValue
  super_class: java.lang.Object
{
  public abstract boolean get();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
Signature: Ljava/lang/Object;Ljavafx/beans/value/ObservableValue<Ljava/lang/Boolean;>;
SourceFile: "ObservableBooleanValue.java"