Exceções
Autor: João Vitor Eifert | Publicado: 2012-09-08T14:41:00-03:00


Aula 25 - 22.08.2012



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&nbsp; As exceções em Java servem para tratar erros possíveis na
execução de um programa. Caso um usuário resolva digitar uma letra ao invés de
um número em uma seleção de números, um erro aparecerá na tela para o usuário.
Usando as exceções do Java, conseguimos retornar na tela uma mensagem de erro
compreensível, e consequentemente não travar o programa.



&nbsp; Se o usuário provocar o erro acima, na tela para o usuário
iria aparecer “InputMismatchException”, então tratamos essa exceção com o try e
catch, ex.:



try {
&nbsp;&nbsp;&nbsp; //execução do programa.

}catch(InputMismatchException e) {

&nbsp;&nbsp;&nbsp; System.out.println(“Erro,
insira apenas números”);

}



&nbsp; Nós podemos também usar às
exceções mas não trata-las, usando a palavra throws, logo após a criação do
método ou classe.



&nbsp; Conteúdo muito útil, que irá
servir bastante para a realização do trabalho.