October 2024
Intermediate to advanced
322 pages
7h 7m
Spanish
Content preview from Recetas Java modernas
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Capítulo 2. El paquete java.util.function
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En el capítulo anterior se trató la sintaxis básica de las expresiones lambda y las referencias a métodos. Un principio básico es que, para cualquiera de ellas, siempre hay un contexto. Las expresiones lambda y las referencias a métodos siempre se asignan a interfaces funcionales, que proporcionan información sobre el único método abstracto que se implementa.
Mientras que muchas interfaces de la biblioteca estándar de Java sólo contienen un único método abstracto y, por tanto, son interfaces funcionales, existe un nuevo paquete diseñado específicamente para contener sólo interfaces funcionales que se reutilizan en el resto de la biblioteca. Ese paquete se llama java.util.function.
Las interfaces de java.util.function se dividen en cuatro categorías: (1) consumidores, (2) proveedores, (3) predicados y (4) funciones. Los consumidores toman un argumento genérico y no devuelven nada. Suppliers no toma argumentos y devuelve un valor. Los predicados toman un argumento y devuelven un booleano. Las funciones toman un único argumento y devuelven un valor.
Para cada una de las interfaces básicas, existen varias relacionadas. Por ejemplo, Consumer tiene variaciones personalizadas para tipos primitivos (IntConsumer, LongConsumer y DoubleConsumer) y una variación (BiConsumer) que toma dos argumentos y devuelve void.
Aunque por definición ...
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