https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
abstract class com.google.common.util.concurrent.CollectionFuture<V, C> extends com.google.common.util.concurrent.AggregateFuture<V, C>
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.common.util.concurrent.CollectionFuture
  super_class: com.google.common.util.concurrent.AggregateFuture
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.CollectionFuture this
         0: .line 31
            aload 0 /* this */
            invokespecial com.google.common.util.concurrent.AggregateFuture.<init>:()V
            return
        end local 0 // com.google.common.util.concurrent.CollectionFuture this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/CollectionFuture<TV;TC;>;
}
Signature: <V:Ljava/lang/Object;C:Ljava/lang/Object;>Lcom/google/common/util/concurrent/AggregateFuture<TV;TC;>;
SourceFile: "CollectionFuture.java"
NestMembers:
  com.google.common.util.concurrent.CollectionFuture$CollectionFutureRunningState  com.google.common.util.concurrent.CollectionFuture$ListFuture  com.google.common.util.concurrent.CollectionFuture$ListFuture$ListFutureRunningState
InnerClasses:
  abstract CollectionFutureRunningState = com.google.common.util.concurrent.CollectionFuture$CollectionFutureRunningState of com.google.common.util.concurrent.CollectionFuture
  final ListFuture = com.google.common.util.concurrent.CollectionFuture$ListFuture of com.google.common.util.concurrent.CollectionFuture
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(emulated = true)