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. 
class com.google.common.util.concurrent.ClosingFuture$Combiner$3 implements com.google.common.util.concurrent.AsyncCallable<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.util.concurrent.ClosingFuture$Combiner$3
  super_class: java.lang.Object
{
  final com.google.common.util.concurrent.ClosingFuture$Combiner this$1;
    descriptor: Lcom/google/common/util/concurrent/ClosingFuture$Combiner;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final com.google.common.util.concurrent.ClosingFuture$Combiner$AsyncCombiningCallable val$combiningCallable;
    descriptor: Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.util.concurrent.ClosingFuture$Combiner, com.google.common.util.concurrent.ClosingFuture$Combiner$AsyncCombiningCallable);
    descriptor: (Lcom/google/common/util/concurrent/ClosingFuture$Combiner;Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
         0: .line 1281
            aload 0 /* this */
            aload 1
            putfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.this$1:Lcom/google/common/util/concurrent/ClosingFuture$Combiner;
            aload 0 /* this */
            aload 2
            putfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.val$combiningCallable:Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/ClosingFuture$Combiner$3;
    MethodParameters:
                       Name  Flags
      this$0                 final
      val$combiningCallable  final

  public com.google.common.util.concurrent.ListenableFuture<V> call();
    descriptor: ()Lcom/google/common/util/concurrent/ListenableFuture;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
         0: .line 1284
            new com.google.common.util.concurrent.ClosingFuture$Peeker
            dup
            aload 0 /* this */
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.this$1:Lcom/google/common/util/concurrent/ClosingFuture$Combiner;
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner.inputs:Lcom/google/common/collect/ImmutableList;
            invokespecial com.google.common.util.concurrent.ClosingFuture$Peeker.<init>:(Lcom/google/common/collect/ImmutableList;)V
            aload 0 /* this */
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.val$combiningCallable:Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;
            aload 0 /* this */
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.this$1:Lcom/google/common/util/concurrent/ClosingFuture$Combiner;
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner.closeables:Lcom/google/common/util/concurrent/ClosingFuture$CloseableList;
            invokevirtual com.google.common.util.concurrent.ClosingFuture$Peeker.callAsync:(Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;Lcom/google/common/util/concurrent/ClosingFuture$CloseableList;)Lcom/google/common/util/concurrent/FluentFuture;
            areturn
        end local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/ClosingFuture$Combiner$3;
    Exceptions:
      throws java.lang.Exception
    Signature: ()Lcom/google/common/util/concurrent/ListenableFuture<TV;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
         0: .line 1289
            aload 0 /* this */
            getfield com.google.common.util.concurrent.ClosingFuture$Combiner$3.val$combiningCallable:Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.util.concurrent.ClosingFuture$Combiner$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/util/concurrent/ClosingFuture$Combiner$3;
}
Signature: Ljava/lang/Object;Lcom/google/common/util/concurrent/AsyncCallable<TV;>;
SourceFile: "ClosingFuture.java"
EnclosingMethod: com.google.common.util.concurrent.ClosingFuture$Combiner.callAsync:(Lcom/google/common/util/concurrent/ClosingFuture$Combiner$AsyncCombiningCallable;Ljava/util/concurrent/Executor;)Lcom/google/common/util/concurrent/ClosingFuture;
NestHost: com.google.common.util.concurrent.ClosingFuture
InnerClasses:
  private final CloseableList = com.google.common.util.concurrent.ClosingFuture$CloseableList of com.google.common.util.concurrent.ClosingFuture
  public Combiner = com.google.common.util.concurrent.ClosingFuture$Combiner of com.google.common.util.concurrent.ClosingFuture
  com.google.common.util.concurrent.ClosingFuture$Combiner$3
  public abstract AsyncCombiningCallable = com.google.common.util.concurrent.ClosingFuture$Combiner$AsyncCombiningCallable of com.google.common.util.concurrent.ClosingFuture$Combiner
  public final Peeker = com.google.common.util.concurrent.ClosingFuture$Peeker of com.google.common.util.concurrent.ClosingFuture