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.mutable.primitive.IntIntHashMap$KeySetIterator implements org.eclipse.collections.api.iterator.MutableIntIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator
  super_class: java.lang.Object
{
  private int count;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

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

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

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

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

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

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

  private void <init>(org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
         0: .line 1394
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap$KeySetIterator;
    MethodParameters:
        Name  Flags
      this$0  final

  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.IntIntHashMap$KeySetIterator this
         0: .line 1406
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.count:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.size:()I
            if_icmpge 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap$KeySetIterator;

  public int next();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
         0: .line 1412
            aload 0 /* this */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.hasNext:()Z
            ifne 2
         1: .line 1414
            new java.util.NoSuchElementException
            dup
            ldc "next() called, but the iterator is exhausted"
            invokespecial java.util.NoSuchElementException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 1416
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.count:I
            iconst_1
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.count:I
         3: .line 1417
            aload 0 /* this */
            iconst_1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.canRemove:Z
         4: .line 1419
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.handledZero:Z
            ifne 9
         5: .line 1421
            aload 0 /* this */
            iconst_1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.handledZero:Z
         6: .line 1422
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            iconst_0
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.containsKey:(I)Z
            ifeq 9
         7: .line 1424
            aload 0 /* this */
            iconst_0
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
         8: .line 1425
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
            ireturn
         9: .line 1428
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.handledOne:Z
            ifne 14
        10: .line 1430
            aload 0 /* this */
            iconst_1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.handledOne:Z
        11: .line 1431
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            iconst_1
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.containsKey:(I)Z
            ifeq 14
        12: .line 1433
            aload 0 /* this */
            iconst_1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
        13: .line 1434
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
            ireturn
        14: .line 1438
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.keysValues:[I
            astore 1 /* keys */
        start local 1 // int[] keys
        15: .line 1439
            goto 17
        16: .line 1441
      StackMap locals: int[]
      StackMap stack:
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
            iconst_2
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
        17: .line 1439
      StackMap locals:
      StackMap stack:
            aload 1 /* keys */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
            iaload
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.isNonSentinel:(I)Z
            ifeq 16
        18: .line 1443
            aload 0 /* this */
            aload 1 /* keys */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
            iaload
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
        19: .line 1444
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
            iconst_2
            iadd
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.position:I
        20: .line 1446
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
            ireturn
        end local 1 // int[] keys
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   21     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap$KeySetIterator;
           15   21     1  keys  [I

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
         0: .line 1452
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.canRemove:Z
            ifne 2
         1: .line 1454
            new java.lang.IllegalStateException
            dup
            invokespecial java.lang.IllegalStateException.<init>:()V
            athrow
         2: .line 1456
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.lastKey:I
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap.removeKey:(I)V
         3: .line 1457
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.count:I
            iconst_1
            isub
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.count:I
         4: .line 1458
            aload 0 /* this */
            iconst_0
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator.canRemove:Z
         5: .line 1459
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntIntHashMap$KeySetIterator;
}
SourceFile: "IntIntHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap
InnerClasses:
  private KeySetIterator = org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap$KeySetIterator of org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap