https://openjdk.java.net/ 
public interface java.util.prefs.PreferenceChangeListener extends java.util.EventListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.util.prefs.PreferenceChangeListener
  super_class: java.lang.Object
{
  public abstract void preferenceChange(java.util.prefs.PreferenceChangeEvent);
    descriptor: (Ljava/util/prefs/PreferenceChangeEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      evt   
}
SourceFile: "PreferenceChangeListener.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()