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.bag.mutable.AbstractHashBag$InternalIterator implements java.util.Iterator<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator
  super_class: java.lang.Object
{
  private final java.util.Iterator<T> iterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Iterator<TT;>;

  private T currentItem;
    descriptor: Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Signature: TT;

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

  private boolean canRemove;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

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

  private void <init>(org.eclipse.collections.impl.bag.mutable.AbstractHashBag);
    descriptor: (Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
         0: .line 330
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.this$0:Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 332
            aload 0 /* this */
            aload 1
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag.items:Lorg/eclipse/collections/api/map/primitive/MutableObjectIntMap;
            invokeinterface org.eclipse.collections.api.map.primitive.MutableObjectIntMap.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.iterator:Ljava/util/Iterator;
         2: .line 330
            return
        end local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag$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.bag.mutable.AbstractHashBag$InternalIterator this
         0: .line 341
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
            ifgt 1
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag$InternalIterator;

  public T next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
         0: .line 347
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
            ifne 3
         1: .line 349
            aload 0 /* this */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.currentItem:Ljava/lang/Object;
         2: .line 350
            aload 0 /* this */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.this$0:Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.currentItem:Ljava/lang/Object;
            invokevirtual org.eclipse.collections.impl.bag.mutable.AbstractHashBag.occurrencesOf:(Ljava/lang/Object;)I
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
         3: .line 352
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
            iconst_1
            isub
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
         4: .line 353
            aload 0 /* this */
            iconst_1
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.canRemove:Z
         5: .line 354
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.currentItem:Ljava/lang/Object;
            areturn
        end local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag$InternalIterator;
    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.bag.mutable.AbstractHashBag$InternalIterator this
         0: .line 360
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.canRemove:Z
            ifne 2
         1: .line 362
            new java.lang.IllegalStateException
            dup
            invokespecial java.lang.IllegalStateException.<init>:()V
            athrow
         2: .line 364
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.occurrences:I
            ifne 6
         3: .line 366
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.iterator:Ljava/util/Iterator;
            invokeinterface java.util.Iterator.remove:()V
         4: .line 367
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.this$0:Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag;
            dup
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag.size:I
            iconst_1
            isub
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag.size:I
         5: .line 368
            goto 7
         6: .line 371
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.this$0:Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.currentItem:Ljava/lang/Object;
            invokevirtual org.eclipse.collections.impl.bag.mutable.AbstractHashBag.remove:(Ljava/lang/Object;)Z
            pop
         7: .line 373
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iconst_0
            putfield org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator.canRemove:Z
         8: .line 374
            return
        end local 0 // org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lorg/eclipse/collections/impl/bag/mutable/AbstractHashBag$InternalIterator;
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<TT;>;
SourceFile: "AbstractHashBag.java"
NestHost: org.eclipse.collections.impl.bag.mutable.AbstractHashBag
InnerClasses:
  private InternalIterator = org.eclipse.collections.impl.bag.mutable.AbstractHashBag$InternalIterator of org.eclipse.collections.impl.bag.mutable.AbstractHashBag