http://fastutil.di.unimi.it/: fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.
  • Sebastiano Vigna 
public interface it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator<K> extends it.unimi.dsi.fastutil.objects.ObjectIterator<K>, it.unimi.dsi.fastutil.BidirectionalIterator<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator
  super_class: java.lang.Object
{
  public int back(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator this
        start local 1 // int n
         0: .line 39
            iload 1 /* n */
            istore 2 /* i */
        start local 2 // int i
         1: .line 40
            goto 3
         2: .line 41
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            invokeinterface it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator.previous:()Ljava/lang/Object;
            pop
         3: .line 40
      StackMap locals:
      StackMap stack:
            iload 2 /* i */
            iinc 2 /* i */ -1
            ifeq 4
            aload 0 /* this */
            invokeinterface it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator.hasPrevious:()Z
            ifne 2
         4: .line 42
      StackMap locals:
      StackMap stack:
            iload 1 /* n */
            iload 2 /* i */
            isub
            iconst_1
            isub
            ireturn
        end local 2 // int i
        end local 1 // int n
        end local 0 // it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator<TK;>;
            0    5     1     n  I
            1    5     2     i  I
    MethodParameters:
      Name  Flags
      n     final

  public int skip(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator this
        start local 1 // int n
         0: .line 47
            aload 0 /* this */
            iload 1 /* n */
            invokespecial it.unimi.dsi.fastutil.objects.ObjectIterator.skip:(I)I
            ireturn
        end local 1 // int n
        end local 0 // it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator<TK;>;
            0    1     1     n  I
    MethodParameters:
      Name  Flags
      n     final
}
Signature: <K:Ljava/lang/Object;>Ljava/lang/Object;Lit/unimi/dsi/fastutil/objects/ObjectIterator<TK;>;Lit/unimi/dsi/fastutil/BidirectionalIterator<TK;>;
SourceFile: "ObjectBidirectionalIterator.java"