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.Iterators$2 implements java.util.Iterator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.Iterators$2
  super_class: java.lang.Object
{
  java.util.Iterator<T> iterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0000) 
    Signature: Ljava/util/Iterator<TT;>;

  private final java.lang.Iterable val$iterable;
    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.Iterators$2 this
         0: .line 391
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.Iterators$2.val$iterable:Ljava/lang/Iterable;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 392
            aload 0 /* this */
            invokestatic com.google.common.collect.Iterators.emptyModifiableIterator:()Ljava/util/Iterator;
            putfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
         2: .line 391
            return
        end local 0 // com.google.common.collect.Iterators$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/google/common/collect/Iterators$2;
    MethodParameters:
              Name  Flags
      val$iterable  final

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.Iterators$2 this
         0: .line 405
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 1
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.val$iterable:Ljava/lang/Iterable;
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 0 // com.google.common.collect.Iterators$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/collect/Iterators$2;

  public T next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.collect.Iterators$2 this
         0: .line 410
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 4
         1: .line 411
            aload 0 /* this */
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.val$iterable:Ljava/lang/Iterable;
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            putfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
         2: .line 412
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 4
         3: .line 413
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         4: .line 416
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.Iterators$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lcom/google/common/collect/Iterators$2;
    Signature: ()TT;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.Iterators$2 this
         0: .line 421
            aload 0 /* this */
            getfield com.google.common.collect.Iterators$2.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
         1: .line 422
            return
        end local 0 // com.google.common.collect.Iterators$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/collect/Iterators$2;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TT;>;
SourceFile: "Iterators.java"
EnclosingMethod: com.google.common.collect.Iterators.cycle:(Ljava/lang/Iterable;)Ljava/util/Iterator;
NestHost: com.google.common.collect.Iterators
InnerClasses:
  com.google.common.collect.Iterators$2