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.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator implements java.util.Iterator<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator
  super_class: java.lang.Object
{
  final org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap this$0;
    descriptor: Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private void <init>(org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap);
    descriptor: (Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
         0: .line 1092
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator.this$0:Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap$InternalIterator;
    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.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
         0: .line 1097
            iconst_0
            ireturn
        end local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap$InternalIterator;

  public V next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
         0: .line 1103
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
        end local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap$InternalIterator;
    Signature: ()TV;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
         0: .line 1109
            new java.lang.UnsupportedOperationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cannot call remove() on "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/immutable/primitive/ImmutableIntObjectEmptyMap$InternalIterator;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TV;>;
SourceFile: "ImmutableIntObjectEmptyMap.java"
NestHost: org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap
InnerClasses:
  private InternalIterator = org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap$InternalIterator of org.eclipse.collections.impl.map.immutable.primitive.ImmutableIntObjectEmptyMap