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 abstract class it.unimi.dsi.fastutil.longs.AbstractLongBidirectionalIterator extends it.unimi.dsi.fastutil.longs.AbstractLongIterator implements it.unimi.dsi.fastutil.longs.LongBidirectionalIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.longs.AbstractLongBidirectionalIterator
  super_class: it.unimi.dsi.fastutil.longs.AbstractLongIterator
{
  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.longs.AbstractLongBidirectionalIterator this
         0: .line 30
            aload 0 /* this */
            invokespecial it.unimi.dsi.fastutil.longs.AbstractLongIterator.<init>:()V
         1: .line 31
            return
        end local 0 // it.unimi.dsi.fastutil.longs.AbstractLongBidirectionalIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lit/unimi/dsi/fastutil/longs/AbstractLongBidirectionalIterator;

  public java.lang.Object previous();
    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
            invokeinterface it.unimi.dsi.fastutil.longs.LongBidirectionalIterator.previous:()Ljava/lang/Long;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "AbstractLongBidirectionalIterator.java"
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()