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 
public class org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator implements java.util.Iterator<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator
  super_class: java.lang.Object
{
  private int count;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private int position;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  final org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView this$1;
    descriptor: Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  public void <init>(org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
         0: .line 2041
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.this$1:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView$InternalKeysViewIterator;
    MethodParameters:
        Name  Flags
      this$0  final

  public K next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
         0: .line 2049
            aload 0 /* this */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.hasNext:()Z
            ifne 2
         1: .line 2051
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
         2: .line 2054
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.this$1:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView.access$0:(Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;)Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap.keys:[Ljava/lang/Object;
            astore 1 /* keys */
        start local 1 // java.lang.Object[] keys
         3: .line 2055
            goto 5
         4: .line 2057
      StackMap locals: java.lang.Object[]
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
            iconst_1
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
         5: .line 2055
      StackMap locals:
      StackMap stack:
            aload 1 /* keys */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
            aaload
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap.isNonSentinel:(Ljava/lang/Object;)Z
            ifeq 4
         6: .line 2059
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.this$1:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView.access$0:(Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;)Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.this$1:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView.access$0:(Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;)Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap.keys:[Ljava/lang/Object;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
            aaload
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap.toNonSentinel:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* result */
        start local 2 // java.lang.Object result
         7: .line 2060
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.count:I
            iconst_1
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.count:I
         8: .line 2061
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
            iconst_1
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.position:I
         9: .line 2062
            aload 2 /* result */
            areturn
        end local 2 // java.lang.Object result
        end local 1 // java.lang.Object[] keys
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   10     0    this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView$InternalKeysViewIterator;
            3   10     1    keys  [Ljava/lang/Object;
            7   10     2  result  TK;
    Signature: ()TK;

  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.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
         0: .line 2068
            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.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView$InternalKeysViewIterator;

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
         0: .line 2074
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.count:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator.this$1:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView.access$0:(Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView;)Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap.size:()I
            if_icmpeq 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectLongHashMap$KeysView$InternalKeysViewIterator;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TK;>;
SourceFile: "ObjectLongHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap
InnerClasses:
  private KeysView = org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView of org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap
  public InternalKeysViewIterator = org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView$InternalKeysViewIterator of org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap$KeysView