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.ObjectBidirectionalIterable<K> extends it.unimi.dsi.fastutil.objects.ObjectIterable<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterable
  super_class: java.lang.Object
{
  public abstract it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator<K> iterator();
    descriptor: ()Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator<TK;>;

  public java.util.Iterator iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterable.iterator:()Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public it.unimi.dsi.fastutil.objects.ObjectIterator iterator();
    descriptor: ()Lit/unimi/dsi/fastutil/objects/ObjectIterator;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterable.iterator:()Lit/unimi/dsi/fastutil/objects/ObjectBidirectionalIterator;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <K:Ljava/lang/Object;>Ljava/lang/Object;Lit/unimi/dsi/fastutil/objects/ObjectIterable<TK;>;
SourceFile: "ObjectBidirectionalIterable.java"