https://github.com/Terracotta-OSS/offheap-store/: A library that offers data structures allocated off the java heap. 
class org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator extends org.terracotta.offheapstore.util.AATreeSet<T>.TreeIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator
  super_class: org.terracotta.offheapstore.util.AATreeSet$TreeIterator
{
  final org.terracotta.offheapstore.util.AATreeSet this$0;
    descriptor: Lorg/terracotta/offheapstore/util/AATreeSet;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  public void <init>();
    descriptor: (Lorg/terracotta/offheapstore/util/AATreeSet;Ljava/lang/Comparable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator this
        start local 2 // java.lang.Comparable start
         0: .line 595
            aload 0 /* this */
            aload 1
            putfield org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator.this$0:Lorg/terracotta/offheapstore/util/AATreeSet;
         1: .line 596
            aload 0 /* this */
            aload 1
            aload 2 /* start */
            invokespecial org.terracotta.offheapstore.util.AATreeSet$TreeIterator.<init>:(Lorg/terracotta/offheapstore/util/AATreeSet;Ljava/lang/Comparable;)V
         2: .line 597
            return
        end local 2 // java.lang.Comparable start
        end local 0 // org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lorg/terracotta/offheapstore/util/AATreeSet$SubTreeIterator;
            0    3     2  start  TT;
    Signature: (TT;)V
    MethodParameters:
        Name  Flags
      this$0  final
      start   
}
Signature: Lorg/terracotta/offheapstore/util/AATreeSet<TT;>.TreeIterator;
SourceFile: "AATreeSet.java"
NestHost: org.terracotta.offheapstore.util.AATreeSet
InnerClasses:
  SubTreeIterator = org.terracotta.offheapstore.util.AATreeSet$SubTreeIterator of org.terracotta.offheapstore.util.AATreeSet
  TreeIterator = org.terracotta.offheapstore.util.AATreeSet$TreeIterator of org.terracotta.offheapstore.util.AATreeSet