September 2024
Intermediate to advanced
414 pages
10h 44m
Spanish
Content preview from Un enfoque funcional de Java
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Capítulo 7. Trabajar con flujos
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Las secuencias utilizan muchas de las características funcionales introducidas en Java 8 para proporcionar una forma declarativa de procesar datos. La API de secuencias cubre muchos casos de uso, pero necesitas saber cómo funcionan las distintas operaciones y las clases ayudantes disponibles para sacarles el máximo partido.
El capítulo 6 se centró en mostrarte los fundamentos de Streams. Este capítulo se basará en ello y te enseñará distintas formas de crear y trabajar con Streams para diversos casos de uso.
Corrientes primitivas
En Java, los genéricos sólo funcionan con tipos basados en objetos (aún1). Por eso Stream<T> no puede utilizarse para secuencias de valores primitivos como int. Sólo hay dos opciones para utilizar tipos primitivos con Streams:
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Autoboxing
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Variantes de corrientes especializadas
El soporte de autoboxing de Java -la conversión automática entre tipos primitivos y sus homólogos basados en objetos como int y Integer-puede parecer una solución sencilla porque funciona automáticamente, como se muestra a continuación:
Stream<Long>longStream=Stream.of(5L,23L,42L);
Sin embargo, el autoboxing introduce múltiples problemas. Por un lado, está la sobrecarga asociada a la conversión de valores primitivos a objetos, en comparación con el uso directo de tipos primitivos. Normalmente, la sobrecarga es insignificante. ...
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