Classes Abstratas
Autor: João Vitor Eifert | Publicado: 2012-09-08T14:32:00-03:00


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Aula 22 - 08.08.2012 



&nbsp; Aprendi que no Java, podemos criar classes Abstratas, no
qual servem para obrigar às classes filhas a instanciarem os métodos que estão
nela. Se uma classe abstrata for implementada a outra, e tentarmos executar esta
sem chamarmos o método abstrato, temos um erro.


&nbsp; Ou seja, métodos abstratos, podem existir somente em classes
abstratas e não em qualquer classe. Um bom exemplo é se nós criarmos uma classe
abstrata Pessoa, e duas outras chamadas PessoaFisica e PessoaJuridica, e
declarar um método para inserir os dados dos mesmos. E após isso, é só
modificar o método em cada classe.


&nbsp; A classe abstrata pode ajudar a evitar de esquecermos de,
por exemplo, testarmos se um CPF é válido ou não.