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 class it.unimi.dsi.fastutil.PriorityQueues
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: it.unimi.dsi.fastutil.PriorityQueues
  super_class: java.lang.Object
{
  public static final it.unimi.dsi.fastutil.PriorityQueues$EmptyPriorityQueue EMPTY_QUEUE;
    descriptor: Lit/unimi/dsi/fastutil/PriorityQueues$EmptyPriorityQueue;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 86
            new it.unimi.dsi.fastutil.PriorityQueues$EmptyPriorityQueue
            dup
            invokespecial it.unimi.dsi.fastutil.PriorityQueues$EmptyPriorityQueue.<init>:()V
            putstatic it.unimi.dsi.fastutil.PriorityQueues.EMPTY_QUEUE:Lit/unimi/dsi/fastutil/PriorityQueues$EmptyPriorityQueue;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.PriorityQueues this
         0: .line 31
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // it.unimi.dsi.fastutil.PriorityQueues this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/PriorityQueues;

  public static <K> it.unimi.dsi.fastutil.PriorityQueue<K> emptyQueue();
    descriptor: ()Lit/unimi/dsi/fastutil/PriorityQueue;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 96
            getstatic it.unimi.dsi.fastutil.PriorityQueues.EMPTY_QUEUE:Lit/unimi/dsi/fastutil/PriorityQueues$EmptyPriorityQueue;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <K:Ljava/lang/Object;>()Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;

  public static <K> it.unimi.dsi.fastutil.PriorityQueue<K> synchronize(it.unimi.dsi.fastutil.PriorityQueue<K>);
    descriptor: (Lit/unimi/dsi/fastutil/PriorityQueue;)Lit/unimi/dsi/fastutil/PriorityQueue;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.PriorityQueue q
         0: .line 165
            new it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue
            dup
            aload 0 /* q */
            invokespecial it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue.<init>:(Lit/unimi/dsi/fastutil/PriorityQueue;)V
            areturn
        end local 0 // it.unimi.dsi.fastutil.PriorityQueue q
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0     q  Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;
    Signature: <K:Ljava/lang/Object;>(Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;)Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;
    MethodParameters:
      Name  Flags
      q     final

  public static <K> it.unimi.dsi.fastutil.PriorityQueue<K> synchronize(it.unimi.dsi.fastutil.PriorityQueue<K>, );
    descriptor: (Lit/unimi/dsi/fastutil/PriorityQueue;Ljava/lang/Object;)Lit/unimi/dsi/fastutil/PriorityQueue;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.PriorityQueue q
        start local 1 // java.lang.Object sync
         0: .line 175
            new it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue
            dup
            aload 0 /* q */
            aload 1 /* sync */
            invokespecial it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue.<init>:(Lit/unimi/dsi/fastutil/PriorityQueue;Ljava/lang/Object;)V
            areturn
        end local 1 // java.lang.Object sync
        end local 0 // it.unimi.dsi.fastutil.PriorityQueue q
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0     q  Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;
            0    1     1  sync  Ljava/lang/Object;
    Signature: <K:Ljava/lang/Object;>(Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;Ljava/lang/Object;)Lit/unimi/dsi/fastutil/PriorityQueue<TK;>;
    MethodParameters:
      Name  Flags
      q     final
      sync  final
}
SourceFile: "PriorityQueues.java"
NestMembers:
  it.unimi.dsi.fastutil.PriorityQueues$EmptyPriorityQueue  it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue
InnerClasses:
  public EmptyPriorityQueue = it.unimi.dsi.fastutil.PriorityQueues$EmptyPriorityQueue of it.unimi.dsi.fastutil.PriorityQueues
  public SynchronizedPriorityQueue = it.unimi.dsi.fastutil.PriorityQueues$SynchronizedPriorityQueue of it.unimi.dsi.fastutil.PriorityQueues