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 
class org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 implements org.eclipse.collections.api.iterator.IntIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1
  super_class: java.lang.Object
{
  private final org.eclipse.collections.api.iterator.IntIterator iterator;
    descriptor: Lorg/eclipse/collections/api/iterator/IntIterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

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

  void <init>(org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable);
    descriptor: (Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
         0: .line 42
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1.this$0:Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 44
            aload 0 /* this */
            aload 1
            getfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable.iterable:Lorg/eclipse/collections/api/IntIterable;
            invokeinterface org.eclipse.collections.api.IntIterable.intIterator:()Lorg/eclipse/collections/api/iterator/IntIterator;
            putfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1.iterator:Lorg/eclipse/collections/api/iterator/IntIterator;
         2: .line 42
            return
        end local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
         0: .line 49
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1.iterator:Lorg/eclipse/collections/api/iterator/IntIterator;
            invokeinterface org.eclipse.collections.api.iterator.IntIterator.hasNext:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable$1;

  public int next();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
         0: .line 55
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1.this$0:Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable;
            getfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable.function:Lorg/eclipse/collections/api/block/function/primitive/IntToIntFunction;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1.iterator:Lorg/eclipse/collections/api/iterator/IntIterator;
            invokeinterface org.eclipse.collections.api.iterator.IntIterator.next:()I
            invokeinterface org.eclipse.collections.api.block.function.primitive.IntToIntFunction.valueOf:(I)I
            ireturn
        end local 0 // org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/lazy/primitive/CollectIntToIntIterable$1;
}
SourceFile: "CollectIntToIntIterable.java"
EnclosingMethod: org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable.intIterator:()Lorg/eclipse/collections/api/iterator/IntIterator;
NestHost: org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable
InnerClasses:
  org.eclipse.collections.impl.lazy.primitive.CollectIntToIntIterable$1