https://github.com/ReactiveX/RxJava: Reactive Extensions for Java
  • David Karnok 
public interface io.reactivex.ObservableOperator<Downstream, Upstream>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.reactivex.ObservableOperator
  super_class: java.lang.Object
{
  public abstract io.reactivex.Observer<? super Upstream> apply(io.reactivex.Observer<? super Downstream>);
    descriptor: (Lio/reactivex/Observer;)Lio/reactivex/Observer;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/reactivex/Observer<-TDownstream;>;)Lio/reactivex/Observer<-TUpstream;>;
    RuntimeInvisibleAnnotations: 
      io.reactivex.annotations.NonNull()
    RuntimeInvisibleParameterAnnotations: 
      0:
        io.reactivex.annotations.NonNull()
    MethodParameters:
          Name  Flags
      observer  
}
Signature: <Downstream:Ljava/lang/Object;Upstream:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "ObservableOperator.java"