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 3. Seus primeiros programas em Java
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Como falamos no Capítulo 1, o Java é tradicionalmente visto como uma linguagem orientada a classes e que tem um modelo de execução distinto: compilação, interpretação e JIT. No entanto, desenvolvimentos recentes ampliaram e generalizaram esse modelo de maneiras que são especialmente úteis para quem está começando no mundo do Java.
Então, neste capítulo, vamos falar sobre essas novas tecnologias e ver como elas criam um caminho novo — e bem mais fácil — para escrever seus primeiros programas em Java. Vamos começar conhecendo o JShell, que é um shell interativo para Java, um pouco parecido com o ciclo “ler-avaliar-imprimir” (REPL) visto em linguagens como Python, Scala ou Lisp.1
Introdução ao JShell
O JShell foi criado para fins de ensino e exploração e, devido à natureza da linguagem Java, não se espera que seja tão útil para programadores experientes quanto shells semelhantes em outras linguagens. Em particular, não se espera que o Java se torne uma linguagem orientada por REPL. Em vez disso, ele oferece a possibilidade de usar o JShell para um estilo diferente de programação, que complementa o uso tradicional, mas também traz novas perspectivas, especialmente ao trabalhar com uma nova API.
É muito fácil usar o JShell para explorar recursos simples da linguagem, por exemplo:
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Tipos de dados primitivos
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Operações ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.