August 2026
Intermediate
538 pages
15h 38m
Portuguese (Portugal, Brazil)
book
Java em poucas palavras (Portuguese Edition), 9th Edition
by Benjamin J. Evans, Jason R. Clark, David Flanagan
Content preview from Java em poucas palavras (Portuguese Edition), 9th Edition
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Capítulo 10. Como lidar com formatos comuns de dados
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Grande parte da programação envolve lidar com dados em vários formatos. Neste capítulo, vamos apresentar o suporte do Java para lidar com duas grandes categorias de dados: texto e números.
A segunda metade do capítulo vai se concentrar no tratamento de informações de data e hora. Essas APIs passaram por uma grande atualização no Java 8, e vamos discutir as APIs modernas em detalhes, junto com algumas informações relevantes sobre a versão antiga, que você ainda pode encontrar. Recomendamos que você atualize para as novas APIs de datas e horas sempre que possível.
Antes de entrarmos nessas complexidades, vamos falar sobre dados textuais e sequências de caracteres.
Texto
Já conhecemos as strings do Java em várias ocasiões. Elas consistem em
sequências de caracteres Unicode e são representadas como instâncias da
classe String. As strings são um dos tipos de dados mais comuns
que os programas Java processam (uma afirmação que você mesmo pode verificar
usando a ferramenta jmap, que vamos conhecer no Apêndice B).
Nesta seção, vamos conhecer a classe String com mais profundidade e entender por que ela ocupa uma posição única na linguagem Java. Mais adiante nesta seção, vamos apresentar as expressões regulares, uma abstração muito comum para procurar padrões em textos (e uma ferramenta clássica no arsenal do programador, ...
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