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.longs.Long2ReferenceFunction<V> extends it.unimi.dsi.fastutil.Function<java.lang.Long, V>, java.util.function.LongFunction<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: it.unimi.dsi.fastutil.longs.Long2ReferenceFunction
  super_class: java.lang.Object
{
  public V apply();
    descriptor: (J)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // long operand
         0: .line 61
            aload 0 /* this */
            lload 1 /* operand */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.get:(J)Ljava/lang/Object;
            areturn
        end local 1 // long operand
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    1     1  operand  J
    Signature: (J)TV;
    MethodParameters:
         Name  Flags
      operand  

  public V put(long, );
    descriptor: (JLjava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=3
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // long key
        start local 3 // java.lang.Object value
         0: .line 75
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 3 // java.lang.Object value
        end local 1 // long key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    1     1    key  J
            0    1     3  value  TV;
    Signature: (JTV;)TV;
    MethodParameters:
       Name  Flags
      key    final
      value  final

  public abstract V get();
    descriptor: (J)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (J)TV;
    MethodParameters:
      Name  Flags
      key   

  public V remove();
    descriptor: (J)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // long key
         0: .line 97
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 1 // long key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    1     1   key  J
    Signature: (J)TV;
    MethodParameters:
      Name  Flags
      key   final

  public V put(java.lang.Long, );
    descriptor: (Ljava/lang/Long;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=7, args_size=3
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // java.lang.Long key
        start local 2 // java.lang.Object value
         0: .line 107
            aload 1 /* key */
            invokevirtual java.lang.Long.longValue:()J
            lstore 3 /* k */
        start local 3 // long k
         1: .line 108
            aload 0 /* this */
            lload 3 /* k */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.containsKey:(J)Z
            istore 5 /* containsKey */
        start local 5 // boolean containsKey
         2: .line 109
            aload 0 /* this */
            lload 3 /* k */
            aload 2 /* value */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.put:(JLjava/lang/Object;)Ljava/lang/Object;
            astore 6 /* v */
        start local 6 // java.lang.Object v
         3: .line 110
            iload 5 /* containsKey */
            ifeq 4
            aload 6 /* v */
            goto 5
      StackMap locals: long int java.lang.Object
      StackMap stack:
         4: aconst_null
      StackMap locals:
      StackMap stack: java.lang.Object
         5: areturn
        end local 6 // java.lang.Object v
        end local 5 // boolean containsKey
        end local 3 // long k
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Long key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    6     0         this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    6     1          key  Ljava/lang/Long;
            0    6     2        value  TV;
            1    6     3            k  J
            2    6     5  containsKey  Z
            3    6     6            v  TV;
    Signature: (Ljava/lang/Long;TV;)TV;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
       Name  Flags
      key    final
      value  final

  public V get();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // java.lang.Object key
         0: .line 120
            aload 1 /* key */
            ifnonnull 2
         1: .line 121
            aconst_null
            areturn
         2: .line 122
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            checkcast java.lang.Long
            invokevirtual java.lang.Long.longValue:()J
            lstore 2 /* k */
        start local 2 // long k
         3: .line 123
            aload 0 /* this */
            lload 2 /* k */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.get:(J)Ljava/lang/Object;
            astore 4 /* v */
        start local 4 // java.lang.Object v
         4: .line 124
            aload 4 /* v */
            aload 0 /* this */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.defaultReturnValue:()Ljava/lang/Object;
            if_acmpne 5
            aload 0 /* this */
            lload 2 /* k */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.containsKey:(J)Z
            ifeq 6
      StackMap locals: long java.lang.Object
      StackMap stack:
         5: aload 4 /* v */
            goto 7
      StackMap locals:
      StackMap stack:
         6: aconst_null
      StackMap locals:
      StackMap stack: java.lang.Object
         7: areturn
        end local 4 // java.lang.Object v
        end local 2 // long k
        end local 1 // java.lang.Object key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    8     1   key  Ljava/lang/Object;
            3    8     2     k  J
            4    8     4     v  TV;
    Signature: (Ljava/lang/Object;)TV;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
      Name  Flags
      key   final

  public V remove();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // java.lang.Object key
         0: .line 134
            aload 1 /* key */
            ifnonnull 2
         1: .line 135
            aconst_null
            areturn
         2: .line 136
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            checkcast java.lang.Long
            invokevirtual java.lang.Long.longValue:()J
            lstore 2 /* k */
        start local 2 // long k
         3: .line 137
            aload 0 /* this */
            lload 2 /* k */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.containsKey:(J)Z
            ifeq 4
            aload 0 /* this */
            lload 2 /* k */
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.remove:(J)Ljava/lang/Object;
            goto 5
      StackMap locals: long
      StackMap stack:
         4: aconst_null
      StackMap locals:
      StackMap stack: java.lang.Object
         5: areturn
        end local 2 // long k
        end local 1 // java.lang.Object key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    6     1   key  Ljava/lang/Object;
            3    6     2     k  J
    Signature: (Ljava/lang/Object;)TV;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
      Name  Flags
      key   final

  public boolean containsKey(long);
    descriptor: (J)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=3, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // long key
         0: .line 152
            iconst_1
            ireturn
        end local 1 // long key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    1     1   key  J
    MethodParameters:
      Name  Flags
      key   

  public boolean containsKey(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // java.lang.Object key
         0: .line 162
            aload 1 /* key */
            ifnonnull 1
            iconst_0
            goto 2
      StackMap locals:
      StackMap stack:
         1: aload 0 /* this */
            aload 1 /* key */
            checkcast java.lang.Long
            invokevirtual java.lang.Long.longValue:()J
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.containsKey:(J)Z
      StackMap locals:
      StackMap stack: int
         2: ireturn
        end local 1 // java.lang.Object key
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    3     1   key  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
      Name  Flags
      key   final

  public void defaultReturnValue();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
        start local 1 // java.lang.Object rv
         0: .line 176
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 1 // java.lang.Object rv
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
            0    1     1    rv  TV;
    Signature: (TV;)V
    MethodParameters:
      Name  Flags
      rv    

  public V defaultReturnValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
         0: .line 188
            aconst_null
            areturn
        end local 0 // it.unimi.dsi.fastutil.longs.Long2ReferenceFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lit/unimi/dsi/fastutil/longs/Long2ReferenceFunction<TV;>;
    Signature: ()TV;

  public java.lang.Object put(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Long
            aload 2
            checkcast java.lang.Object
            invokeinterface it.unimi.dsi.fastutil.longs.Long2ReferenceFunction.put:(Ljava/lang/Long;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;Lit/unimi/dsi/fastutil/Function<Ljava/lang/Long;TV;>;Ljava/util/function/LongFunction<TV;>;
SourceFile: "Long2ReferenceFunction.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()