https://openjdk.java.net/ 
public interface java.awt.KeyEventPostProcessor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.awt.KeyEventPostProcessor
  super_class: java.lang.Object
{
  public abstract boolean postProcessKeyEvent(java.awt.event.KeyEvent);
    descriptor: (Ljava/awt/event/KeyEvent;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      e     
}
SourceFile: "KeyEventPostProcessor.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()