https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
class org.graalvm.collections.EconomicMap$1 implements org.graalvm.collections.EconomicMap<K, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.graalvm.collections.EconomicMap$1
  super_class: java.lang.Object
{
  private final java.util.Map val$map;
    descriptor: Ljava/util/Map;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(java.util.Map);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 232
            aload 0 /* this */
            aload 1
            putfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/collections/EconomicMap$1;
    MethodParameters:
         Name  Flags
      val$map  final

  public V get();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.lang.Object key
         0: .line 236
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* result */
        start local 2 // java.lang.Object result
         1: .line 237
            aload 2 /* result */
            areturn
        end local 2 // java.lang.Object result
        end local 1 // java.lang.Object key
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/collections/EconomicMap$1;
            0    2     1     key  TK;
            1    2     2  result  TV;
    Signature: (TK;)TV;
    MethodParameters:
      Name  Flags
      key   

  public V put(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 242
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* key */
            aload 2 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            astore 3 /* result */
        start local 3 // java.lang.Object result
         1: .line 243
            aload 3 /* result */
            areturn
        end local 3 // java.lang.Object result
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Object key
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/collections/EconomicMap$1;
            0    2     1     key  TK;
            0    2     2   value  TV;
            1    2     3  result  TV;
    Signature: (TK;TV;)TV;
    MethodParameters:
       Name  Flags
      key    
      value  

  public V putIfAbsent(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.lang.Object key
        start local 2 // java.lang.Object value
         0: .line 248
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* key */
            aload 2 /* value */
            invokeinterface java.util.Map.putIfAbsent:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            astore 3 /* result */
        start local 3 // java.lang.Object result
         1: .line 249
            aload 3 /* result */
            areturn
        end local 3 // java.lang.Object result
        end local 2 // java.lang.Object value
        end local 1 // java.lang.Object key
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/collections/EconomicMap$1;
            0    2     1     key  TK;
            0    2     2   value  TV;
            1    2     3  result  TV;
    Signature: (TK;TV;)TV;
    MethodParameters:
       Name  Flags
      key    
      value  

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 254
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.size:()I
            istore 1 /* result */
        start local 1 // int result
         1: .line 255
            iload 1 /* result */
            ireturn
        end local 1 // int result
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/collections/EconomicMap$1;
            1    2     1  result  I

  public boolean containsKey();
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.lang.Object key
         0: .line 260
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object key
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/collections/EconomicMap$1;
            0    1     1   key  TK;
    Signature: (TK;)Z
    MethodParameters:
      Name  Flags
      key   

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 265
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.clear:()V
         1: .line 266
            return
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/collections/EconomicMap$1;

  public V removeKey();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.lang.Object key
         0: .line 270
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* result */
        start local 2 // java.lang.Object result
         1: .line 271
            aload 2 /* result */
            areturn
        end local 2 // java.lang.Object result
        end local 1 // java.lang.Object key
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/collections/EconomicMap$1;
            0    2     1     key  TK;
            1    2     2  result  TV;
    Signature: (TK;)TV;
    MethodParameters:
      Name  Flags
      key   

  public java.lang.Iterable<V> getValues();
    descriptor: ()Ljava/lang/Iterable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 276
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.values:()Ljava/util/Collection;
            areturn
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/collections/EconomicMap$1;
    Signature: ()Ljava/lang/Iterable<TV;>;

  public java.lang.Iterable<K> getKeys();
    descriptor: ()Ljava/lang/Iterable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 281
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            areturn
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/collections/EconomicMap$1;
    Signature: ()Ljava/lang/Iterable<TK;>;

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 286
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.isEmpty:()Z
            ireturn
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/collections/EconomicMap$1;

  public org.graalvm.collections.MapCursor<K, V> getEntries();
    descriptor: ()Lorg/graalvm/collections/MapCursor;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // org.graalvm.collections.EconomicMap$1 this
         0: .line 291
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            invokeinterface java.util.Map.entrySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            astore 1 /* iterator */
        start local 1 // java.util.Iterator iterator
         1: .line 292
            new org.graalvm.collections.EconomicMap$1$1
            dup
            aload 0 /* this */
            aload 1 /* iterator */
            invokespecial org.graalvm.collections.EconomicMap$1$1.<init>:(Lorg/graalvm/collections/EconomicMap$1;Ljava/util/Iterator;)V
            areturn
        end local 1 // java.util.Iterator iterator
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lorg/graalvm/collections/EconomicMap$1;
            1    2     1  iterator  Ljava/util/Iterator<Ljava/util/Map$Entry<TK;TV;>;>;
    Signature: ()Lorg/graalvm/collections/MapCursor<TK;TV;>;

  public void replaceAll(java.util.function.BiFunction<? super K, ? super V, ? extends V>);
    descriptor: (Ljava/util/function/BiFunction;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.graalvm.collections.EconomicMap$1 this
        start local 1 // java.util.function.BiFunction function
         0: .line 325
            aload 0 /* this */
            getfield org.graalvm.collections.EconomicMap$1.val$map:Ljava/util/Map;
            aload 1 /* function */
            invokeinterface java.util.Map.replaceAll:(Ljava/util/function/BiFunction;)V
         1: .line 326
            return
        end local 1 // java.util.function.BiFunction function
        end local 0 // org.graalvm.collections.EconomicMap$1 this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lorg/graalvm/collections/EconomicMap$1;
            0    2     1  function  Ljava/util/function/BiFunction<-TK;-TV;+TV;>;
    Signature: (Ljava/util/function/BiFunction<-TK;-TV;+TV;>;)V
    MethodParameters:
          Name  Flags
      function  

  public org.graalvm.collections.UnmodifiableMapCursor getEntries();
    descriptor: ()Lorg/graalvm/collections/UnmodifiableMapCursor;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual org.graalvm.collections.EconomicMap$1.getEntries:()Lorg/graalvm/collections/MapCursor;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lorg/graalvm/collections/EconomicMap<TK;TV;>;
SourceFile: "EconomicMap.java"
EnclosingMethod: org.graalvm.collections.EconomicMap.wrapMap:(Ljava/util/Map;)Lorg/graalvm/collections/EconomicMap;
NestHost: org.graalvm.collections.EconomicMap
InnerClasses:
  public abstract Entry = java.util.Map$Entry of java.util.Map
  org.graalvm.collections.EconomicMap$1
  org.graalvm.collections.EconomicMap$1$1