October 2024
Intermediate to advanced
322 pages
7h 7m
Spanish
Content preview from Recetas Java modernas
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Capítulo 3. Corrientes
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Java 8 introduce una nueva metáfora de flujo para dar soporte a la programación funcional. Un flujo es una secuencia de elementos que no guarda los elementos ni modifica la fuente original. La programación funcional en Java suele implicar la generación de un flujo a partir de alguna fuente de datos, pasando los elementos por una serie de operaciones intermedias (llamadas canalización), y completando el proceso con una expresión terminal.
Los flujos sólo pueden utilizarse una vez. Después de que un flujo haya pasado por cero o más operaciones intermedias y llegado a una operación terminal, está terminado. Para volver a procesar los valores, tienes que crear un nuevo flujo.
Los flujos también son perezosos. Un flujo sólo procesará tantos datos como sean necesarios para alcanzar la condición terminal. La receta 3.13 muestra esto en acción.
Las recetas de este capítulo muestran varias operaciones típicas de flujo.
3.1 Crear flujos
Problema
Quieres crear un flujo a partir de una fuente de datos.
Solución
Utiliza los métodos de fábrica estáticos de la interfaz Stream, o los métodos stream de Iterable o Arrays.
Debate
La nueva interfaz java.util.stream.Stream de Java 8 proporciona varios métodos estáticos para crear flujos. En concreto, puedes utilizar los métodos estáticos Stream.of, Stream.iterate, y Stream.generate.
El método Stream.of
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