September 2024
Intermediate to advanced
450 pages
14h 37m
Spanish
Content preview from Rendimiento de Java, 2ª Edición
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Capítulo 12. Consejos sobre la API de Java SE
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Este capítulo trata de las áreas de la API de Java SE que tienen peculiaridades de implementación que afectan a su rendimiento. Existen muchos detalles de implementación de este tipo en todo el JDK; éstas son las áreas en las que descubro sistemáticamente problemas de rendimiento (incluso en mi propio código). Este capítulo incluye detalles sobre la mejor forma de tratar las cadenas (y especialmente las cadenas duplicadas); formas de almacenar correctamente la E/S; carga de clases y formas de mejorar el inicio de las aplicaciones que utilizan muchas clases; uso adecuado de las colecciones; y funciones del JDK 8 como lambdas y flujos.
Cuerdas
Las cadenas son (como era de esperar) el objeto Java más común. En esta sección, veremos diversas formas de gestionar toda la memoria que consumen los objetos cadena; estas técnicas pueden reducir a menudo de forma significativa la cantidad de heap que necesita tu programa. También cubriremos una nueva característica de JDK 11 de las cadenas que implica la concatenación.
Cuerdas Compactas
En Java 8, todas las cadenas se codifican como matrices de caracteres de 16 bits, independientemente de la codificación de la cadena. Esto es un desperdicio: la mayoría de las configuraciones regionales occidentales pueden codificar cadenas en matrices de bytes de 8 bits, e incluso en una configuración ...
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