https://openjdk.java.net/ 
public interface java.util.concurrent.RunnableFuture<V> extends java.lang.Runnable, java.util.concurrent.Future<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.util.concurrent.RunnableFuture
  super_class: java.lang.Object
{
  public abstract void run();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;Ljava/lang/Runnable;Ljava/util/concurrent/Future<TV;>;
SourceFile: "RunnableFuture.java"