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.collect.FluentIterable$2 extends com.google.common.collect.FluentIterable<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.FluentIterable$2
  super_class: com.google.common.collect.FluentIterable
{
  private final java.lang.Iterable val$inputs;
    descriptor: Ljava/lang/Iterable;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(java.lang.Iterable);
    descriptor: (Ljava/lang/Iterable;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.FluentIterable$2 this
         0: .line 274
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.FluentIterable$2.val$inputs:Ljava/lang/Iterable;
            aload 0 /* this */
            invokespecial com.google.common.collect.FluentIterable.<init>:()V
            return
        end local 0 // com.google.common.collect.FluentIterable$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/FluentIterable$2;
    MethodParameters:
            Name  Flags
      val$inputs  final

  public java.util.Iterator<T> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.collect.FluentIterable$2 this
         0: .line 277
            aload 0 /* this */
            getfield com.google.common.collect.FluentIterable$2.val$inputs:Ljava/lang/Iterable;
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            invokestatic com.google.common.collect.Iterables.toIterator:()Lcom/google/common/base/Function;
            invokestatic com.google.common.collect.Iterators.transform:(Ljava/util/Iterator;Lcom/google/common/base/Function;)Ljava/util/Iterator;
            invokestatic com.google.common.collect.Iterators.concat:(Ljava/util/Iterator;)Ljava/util/Iterator;
            areturn
        end local 0 // com.google.common.collect.FluentIterable$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/FluentIterable$2;
    Signature: ()Ljava/util/Iterator<TT;>;
}
Signature: Lcom/google/common/collect/FluentIterable<TT;>;
SourceFile: "FluentIterable.java"
EnclosingMethod: com.google.common.collect.FluentIterable.concat:(Ljava/lang/Iterable;)Lcom/google/common/collect/FluentIterable;
NestHost: com.google.common.collect.FluentIterable
InnerClasses:
  com.google.common.collect.FluentIterable$2