http://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public interface com.sun.glass.ui.MenuItem$Callback
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.glass.ui.MenuItem$Callback
  super_class: java.lang.Object
{
  public abstract void action();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void validate();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "MenuItem.java"
NestHost: com.sun.glass.ui.MenuItem
InnerClasses:
  public abstract Callback = com.sun.glass.ui.MenuItem$Callback of com.sun.glass.ui.MenuItem