java.FILE
  IMPORT_LIST
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  CLASS
    MODIFIER_LIST
      <empty list>
    CLASS_KEYWORD
    WHITE_SPACE
    IDENTIFIER
    TYPE_PARAMETER_LIST
      <empty list>
    EXTENDS_LIST
      <empty list>
    IMPLEMENTS_LIST
      <empty list>
    WHITE_SPACE
    LBRACE
    WHITE_SPACE
    METHOD
      MODIFIER_LIST
        <empty list>
      TYPE_PARAMETER_LIST
        <empty list>
      TYPE
        VOID_KEYWORD
      WHITE_SPACE
      IDENTIFIER
      PARAMETER_LIST
        LPARENTH
        RPARENTH
      THROWS_LIST
        <empty list>
      WHITE_SPACE
      CODE_BLOCK
        LBRACE
        WHITE_SPACE
        DECLARATION_STATEMENT
          CLASS
            MODIFIER_LIST
              SEALED
            WHITE_SPACE
            CLASS_KEYWORD
            WHITE_SPACE
            IDENTIFIER
            TYPE_PARAMETER_LIST
              <empty list>
            EXTENDS_LIST
              <empty list>
            IMPLEMENTS_LIST
              <empty list>
            WHITE_SPACE
            LBRACE
            RBRACE
        WHITE_SPACE
        DECLARATION_STATEMENT
          CLASS
            MODIFIER_LIST
              NON_SEALED
            WHITE_SPACE
            CLASS_KEYWORD
            WHITE_SPACE
            IDENTIFIER
            TYPE_PARAMETER_LIST
              <empty list>
            EXTENDS_LIST
              <empty list>
            IMPLEMENTS_LIST
              <empty list>
            WHITE_SPACE
            LBRACE
            RBRACE
        WHITE_SPACE
        RBRACE
    WHITE_SPACE
    RBRACE