https://openjdk.java.net/ 
public interface java.util.concurrent.Flow$Publisher<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.util.concurrent.Flow$Publisher
  super_class: java.lang.Object
{
  public abstract void subscribe(java.util.concurrent.Flow$Subscriber<? super T>);
    descriptor: (Ljava/util/concurrent/Flow$Subscriber;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljava/util/concurrent/Flow$Subscriber<-TT;>;)V
    MethodParameters:
            Name  Flags
      subscriber  
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "Flow.java"
NestHost: java.util.concurrent.Flow
InnerClasses:
  public abstract Publisher = java.util.concurrent.Flow$Publisher of java.util.concurrent.Flow
  public abstract Subscriber = java.util.concurrent.Flow$Subscriber of java.util.concurrent.Flow
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()