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 abstract class org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator implements java.util.Iterator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator
  super_class: java.lang.Object
{
  private int next;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

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

  protected void <init>(org.eclipse.collections.impl.set.immutable.AbstractImmutableSet);
    descriptor: (Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
         0: .line 316
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet$ImmutableSetIterator;
    MethodParameters:
        Name  Flags
      this$0  final

  protected abstract T getElement();
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0404) ACC_PROTECTED, ACC_ABSTRACT
    Signature: (I)TT;
    MethodParameters:
      Name  Flags
      i     

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
         0: .line 326
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.next:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.this$0:Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet;
            invokevirtual org.eclipse.collections.impl.set.immutable.AbstractImmutableSet.size:()I
            if_icmpge 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet$ImmutableSetIterator;

  public T next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
         0: .line 332
            aload 0 /* this */
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.next:I
            dup_x1
            iconst_1
            iadd
            putfield org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.next:I
            invokevirtual org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator.getElement:(I)Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet$ImmutableSetIterator;
    Signature: ()TT;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
         0: .line 338
            new java.lang.UnsupportedOperationException
            dup
            ldc "Cannot remove from an ImmutableSet"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/set/immutable/AbstractImmutableSet$ImmutableSetIterator;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TT;>;
SourceFile: "AbstractImmutableSet.java"
NestHost: org.eclipse.collections.impl.set.immutable.AbstractImmutableSet
InnerClasses:
  protected abstract ImmutableSetIterator = org.eclipse.collections.impl.set.immutable.AbstractImmutableSet$ImmutableSetIterator of org.eclipse.collections.impl.set.immutable.AbstractImmutableSet