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.list.Interval$IntegerIterator implements java.util.Iterator<java.lang.Integer>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.list.Interval$IntegerIterator
  super_class: java.lang.Object
{
  private int current;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

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

  private void <init>(org.eclipse.collections.impl.list.Interval);
    descriptor: (Lorg/eclipse/collections/impl/list/Interval;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
         0: .line 788
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 790
            aload 0 /* this */
            aload 1
            getfield org.eclipse.collections.impl.list.Interval.from:I
            putfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
         2: .line 788
            return
        end local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/list/Interval$IntegerIterator;
    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.list.Interval$IntegerIterator this
         0: .line 795
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            getfield org.eclipse.collections.impl.list.Interval.from:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            getfield org.eclipse.collections.impl.list.Interval.to:I
            if_icmpgt 3
         1: .line 797
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            getfield org.eclipse.collections.impl.list.Interval.to:I
            if_icmpgt 2
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         2: iconst_0
            ireturn
         3: .line 799
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            getfield org.eclipse.collections.impl.list.Interval.to:I
            if_icmplt 4
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         4: iconst_0
            ireturn
        end local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/eclipse/collections/impl/list/Interval$IntegerIterator;

  public java.lang.Integer next();
    descriptor: ()Ljava/lang/Integer;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
         0: .line 805
            aload 0 /* this */
            invokevirtual org.eclipse.collections.impl.list.Interval$IntegerIterator.hasNext:()Z
            ifeq 4
         1: .line 807
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            astore 1 /* result */
        start local 1 // java.lang.Integer result
         2: .line 808
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
            aload 0 /* this */
            getfield org.eclipse.collections.impl.list.Interval$IntegerIterator.this$0:Lorg/eclipse/collections/impl/list/Interval;
            getfield org.eclipse.collections.impl.list.Interval.step:I
            iadd
            putfield org.eclipse.collections.impl.list.Interval$IntegerIterator.current:I
         3: .line 809
            aload 1 /* result */
            areturn
        end local 1 // java.lang.Integer result
         4: .line 811
      StackMap locals:
      StackMap stack:
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
        end local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0    this  Lorg/eclipse/collections/impl/list/Interval$IntegerIterator;
            2    4     1  result  Ljava/lang/Integer;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
         0: .line 817
            new java.lang.UnsupportedOperationException
            dup
            ldc "Cannot remove a value from an Interval"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.eclipse.collections.impl.list.Interval$IntegerIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/list/Interval$IntegerIterator;

  public java.lang.Object next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual org.eclipse.collections.impl.list.Interval$IntegerIterator.next:()Ljava/lang/Integer;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<Ljava/lang/Integer;>;
SourceFile: "Interval.java"
NestHost: org.eclipse.collections.impl.list.Interval
InnerClasses:
  private IntegerIterator = org.eclipse.collections.impl.list.Interval$IntegerIterator of org.eclipse.collections.impl.list.Interval