https://jsoup.org/: jsoup is a Java library for working with real-world HTML. It provides a very convenient API for extracting and manipulating data, using the best of DOM, CSS, and jquery-like methods. jsoup implements the WHATWG HTML5 specification, and parses HTML to the same DOM as modern browsers do. (Jonathan Hedley)
  • Jonathan Hedley 
public final class org.jsoup.select.Evaluator$IsFirstOfType extends org.jsoup.select.Evaluator$IsNthOfType
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.jsoup.select.Evaluator$IsFirstOfType
  super_class: org.jsoup.select.Evaluator$IsNthOfType
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.jsoup.select.Evaluator$IsFirstOfType this
         0: .line 413
            aload 0 /* this */
            iconst_0
            iconst_1
            invokespecial org.jsoup.select.Evaluator$IsNthOfType.<init>:(II)V
         1: .line 414
            return
        end local 0 // org.jsoup.select.Evaluator$IsFirstOfType this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/jsoup/select/Evaluator$IsFirstOfType;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.jsoup.select.Evaluator$IsFirstOfType this
         0: .line 417
            ldc ":first-of-type"
            areturn
        end local 0 // org.jsoup.select.Evaluator$IsFirstOfType this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/jsoup/select/Evaluator$IsFirstOfType;
}
SourceFile: "Evaluator.java"
NestHost: org.jsoup.select.Evaluator
InnerClasses:
  public final IsFirstOfType = org.jsoup.select.Evaluator$IsFirstOfType of org.jsoup.select.Evaluator
  public IsNthOfType = org.jsoup.select.Evaluator$IsNthOfType of org.jsoup.select.Evaluator