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+package task12;%0A%0A/*%0A * Lexeme type constants%0A */%0Aenum Lex %7B%0A    ID_OR_KW,%0A    ASSIGN, PLUS, MINUS, ASTERISK, SLASH, QUOTE, APOSTROPHE,%0A    COLON, SEMICOL, LPAREN, RPAREN, LBRACKET, RBRACKET, LBRACE, RBRACE,%0A    INT, FLOAT,%0A    ILLEGAL,%0A    EOF, LEXER_ERROR, UNEXPECTED_EOF%0A    ;%0A%7D%0A

Create Lex.java