https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
final class org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator implements java.util.Iterator<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator
  super_class: java.lang.Object
{
  private final java.util.Iterator<java.lang.Iterable<E>> iterablesIterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Iterator<Ljava/lang/Iterable<TE;>;>;

  private java.util.Iterator<E> innerIterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Iterator<TE;>;

  final org.eclipse.collections.impl.lazy.CompositeIterable this$0;
    descriptor: Lorg/eclipse/collections/impl/lazy/CompositeIterable;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private void <init>(org.eclipse.collections.api.list.MutableList<java.lang.Iterable<E>>);
    descriptor: (Lorg/eclipse/collections/impl/lazy/CompositeIterable;Lorg/eclipse/collections/api/list/MutableList;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
        start local 2 // org.eclipse.collections.api.list.MutableList iterables
         0: .line 142
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.this$0:Lorg/eclipse/collections/impl/lazy/CompositeIterable;
         1: .line 141
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         2: .line 143
            aload 0 /* this */
            aload 2 /* iterables */
            invokeinterface org.eclipse.collections.api.list.MutableList.listIterator:()Ljava/util/ListIterator;
            putfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.iterablesIterator:Ljava/util/Iterator;
         3: .line 144
            aload 0 /* this */
            invokestatic org.eclipse.collections.impl.EmptyIterator.getInstance:()Lorg/eclipse/collections/impl/EmptyIterator;
            putfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.innerIterator:Ljava/util/Iterator;
         4: .line 145
            return
        end local 2 // org.eclipse.collections.api.list.MutableList iterables
        end local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    5     0       this  Lorg/eclipse/collections/impl/lazy/CompositeIterable$CompositeIterator;
            0    5     2  iterables  Lorg/eclipse/collections/api/list/MutableList<Ljava/lang/Iterable<TE;>;>;
    Signature: (Lorg/eclipse/collections/api/list/MutableList<Ljava/lang/Iterable<TE;>;>;)V
    MethodParameters:
           Name  Flags
      this$0     final
      iterables  

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
         0: .line 152
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.innerIterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifeq 2
         1: .line 154
            iconst_1
            ireturn
         2: .line 156
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.iterablesIterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 4
         3: .line 158
            iconst_0
            ireturn
         4: .line 160
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.iterablesIterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Iterable
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            putfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.innerIterator:Ljava/util/Iterator;
         5: .line 150
            goto 0
        end local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/eclipse/collections/impl/lazy/CompositeIterable$CompositeIterator;

  public E next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
         0: .line 167
            aload 0 /* this */
            invokevirtual org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.hasNext:()Z
            ifne 2
         1: .line 169
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 171
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator.innerIterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/lazy/CompositeIterable$CompositeIterator;
    Signature: ()TE;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
         0: .line 177
            new java.lang.UnsupportedOperationException
            dup
            ldc "Cannot remove from a composite iterator"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/lazy/CompositeIterable$CompositeIterator;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TE;>;
SourceFile: "CompositeIterable.java"
NestHost: org.eclipse.collections.impl.lazy.CompositeIterable
InnerClasses:
  private final CompositeIterator = org.eclipse.collections.impl.lazy.CompositeIterable$CompositeIterator of org.eclipse.collections.impl.lazy.CompositeIterable