https://www.graalvm.org/ 
final class com.oracle.truffle.polyglot.PolyglotMap$EntryImpl implements java.util.Map$Entry<K, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotMap$EntryImpl
  super_class: java.lang.Object
{
  private final K key;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: TK;

  final com.oracle.truffle.polyglot.PolyglotMap this$0;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotMap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>();
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotMap;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
        start local 2 // java.lang.Object key
         0: .line 331
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.this$0:Lcom/oracle/truffle/polyglot/PolyglotMap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 332
            aload 0 /* this */
            aload 2 /* key */
            putfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
         2: .line 333
            return
        end local 2 // java.lang.Object key
        end local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/polyglot/PolyglotMap$EntryImpl;
            0    3     2   key  TK;
    Signature: (TK;)V
    MethodParameters:
        Name  Flags
      this$0  final
      key     

  public K getKey();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
         0: .line 337
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
            areturn
        end local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotMap$EntryImpl;
    Signature: ()TK;

  public V getValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
         0: .line 342
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.this$0:Lcom/oracle/truffle/polyglot/PolyglotMap;
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
            invokevirtual com.oracle.truffle.polyglot.PolyglotMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotMap$EntryImpl;
    Signature: ()TV;

  public V setValue();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
        start local 1 // java.lang.Object value
         0: .line 347
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.this$0:Lcom/oracle/truffle/polyglot/PolyglotMap;
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
            aload 1 /* value */
            invokevirtual com.oracle.truffle.polyglot.PolyglotMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object value
        end local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/polyglot/PolyglotMap$EntryImpl;
            0    1     1  value  TV;
    Signature: (TV;)TV;
    MethodParameters:
       Name  Flags
      value  

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
         0: .line 352
            new java.lang.StringBuilder
            dup
            ldc "Entry[key="
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc ", value="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.this$0:Lcom/oracle/truffle/polyglot/PolyglotMap;
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotMap$EntryImpl.key:Ljava/lang/Object;
            invokevirtual com.oracle.truffle.polyglot.PolyglotMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc "]"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.oracle.truffle.polyglot.PolyglotMap$EntryImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotMap$EntryImpl;
}
Signature: Ljava/lang/Object;Ljava/util/Map$Entry<TK;TV;>;
SourceFile: "PolyglotMap.java"
NestHost: com.oracle.truffle.polyglot.PolyglotMap
InnerClasses:
  private final EntryImpl = com.oracle.truffle.polyglot.PolyglotMap$EntryImpl of com.oracle.truffle.polyglot.PolyglotMap
  public abstract Entry = java.util.Map$Entry of java.util.Map