https://www.graalvm.org/ 
public class com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken extends com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken
  super_class: com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token
{
  private final java.lang.String groupName;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken this
        start local 1 // java.lang.String groupName
         0: .line 182
            aload 0 /* this */
            getstatic com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token$Kind.namedCaptureGroup:Lcom/oracle/truffle/js/builtins/helper/ReplaceStringParser$Token$Kind;
            invokespecial com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token.<init>:(Lcom/oracle/truffle/js/builtins/helper/ReplaceStringParser$Token$Kind;)V
         1: .line 183
            aload 0 /* this */
            aload 1 /* groupName */
            putfield com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken.groupName:Ljava/lang/String;
         2: .line 184
            return
        end local 1 // java.lang.String groupName
        end local 0 // com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Lcom/oracle/truffle/js/builtins/helper/ReplaceStringParser$NamedCaptureGroupToken;
            0    3     1  groupName  Ljava/lang/String;
    MethodParameters:
           Name  Flags
      groupName  

  public java.lang.String getGroupName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken this
         0: .line 187
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken.groupName:Ljava/lang/String;
            areturn
        end local 0 // com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/builtins/helper/ReplaceStringParser$NamedCaptureGroupToken;
}
SourceFile: "ReplaceStringParser.java"
NestHost: com.oracle.truffle.js.builtins.helper.ReplaceStringParser
InnerClasses:
  public NamedCaptureGroupToken = com.oracle.truffle.js.builtins.helper.ReplaceStringParser$NamedCaptureGroupToken of com.oracle.truffle.js.builtins.helper.ReplaceStringParser
  public Token = com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token of com.oracle.truffle.js.builtins.helper.ReplaceStringParser
  public final Kind = com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token$Kind of com.oracle.truffle.js.builtins.helper.ReplaceStringParser$Token