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.objects.AbstractReference2IntSortedMap<K> extends it.unimi.dsi.fastutil.objects.AbstractReference2IntMap<K> implements it.unimi.dsi.fastutil.objects.Reference2IntSortedMap<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap
  super_class: it.unimi.dsi.fastutil.objects.AbstractReference2IntMap
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: -1773560792952436569

  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
         0: .line 30
            aload 0 /* this */
            invokespecial it.unimi.dsi.fastutil.objects.AbstractReference2IntMap.<init>:()V
         1: .line 31
            return
        end local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lit/unimi/dsi/fastutil/objects/AbstractReference2IntSortedMap<TK;>;

  public it.unimi.dsi.fastutil.objects.ReferenceSortedSet<K> keySet();
    descriptor: ()Lit/unimi/dsi/fastutil/objects/ReferenceSortedSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
         0: .line 48
            new it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySet
            dup
            aload 0 /* this */
            invokespecial it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySet.<init>:(Lit/unimi/dsi/fastutil/objects/AbstractReference2IntSortedMap;)V
            areturn
        end local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/objects/AbstractReference2IntSortedMap<TK;>;
    Signature: ()Lit/unimi/dsi/fastutil/objects/ReferenceSortedSet<TK;>;

  public it.unimi.dsi.fastutil.ints.IntCollection values();
    descriptor: ()Lit/unimi/dsi/fastutil/ints/IntCollection;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
         0: .line 141
            new it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesCollection
            dup
            aload 0 /* this */
            invokespecial it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesCollection.<init>:(Lit/unimi/dsi/fastutil/objects/AbstractReference2IntSortedMap;)V
            areturn
        end local 0 // it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/objects/AbstractReference2IntSortedMap<TK;>;

  public java.util.Set keySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap.keySet:()Lit/unimi/dsi/fastutil/objects/ReferenceSortedSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public it.unimi.dsi.fastutil.objects.ReferenceSet keySet();
    descriptor: ()Lit/unimi/dsi/fastutil/objects/ReferenceSet;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap.keySet:()Lit/unimi/dsi/fastutil/objects/ReferenceSortedSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Set entrySet();
    descriptor: ()Ljava/util/Set;
    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.Reference2IntSortedMap.entrySet:()Lit/unimi/dsi/fastutil/objects/ObjectSortedSet;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Collection values();
    descriptor: ()Ljava/util/Collection;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap.values:()Lit/unimi/dsi/fastutil/ints/IntCollection;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <K:Ljava/lang/Object;>Lit/unimi/dsi/fastutil/objects/AbstractReference2IntMap<TK;>;Lit/unimi/dsi/fastutil/objects/Reference2IntSortedMap<TK;>;
SourceFile: "AbstractReference2IntSortedMap.java"
NestMembers:
  it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySet  it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySetIterator  it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesCollection  it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesIterator
InnerClasses:
  protected KeySet = it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySet of it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap
  protected KeySetIterator = it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$KeySetIterator of it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap
  protected ValuesCollection = it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesCollection of it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap
  protected ValuesIterator = it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap$ValuesIterator of it.unimi.dsi.fastutil.objects.AbstractReference2IntSortedMap
  public abstract Entry = java.util.Map$Entry of java.util.Map