October 2024
Intermediate to advanced
638 pages
15h 47m
Spanish
Content preview from Libro de cocina de Java, 4ª edición
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Capítulo 7. Estructurar datos con Java
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7.0 Introducción
Casi todas las aplicaciones más allá de "Hola, mundo" necesitan hacer un seguimiento de algunos datos estructurados. Un simple problema numérico podría funcionar sólo con tres o cuatro números, pero la mayoría de las aplicaciones tienen grupos de elementos de datos similares. Una aplicación basada en GUI puede necesitar hacer un seguimiento de varias ventanas de diálogo. Un gestor de información personal, o PIM, tiene que llevar la cuenta de varias personas. Un sistema operativo necesita saber quién puede iniciar sesión, quién está conectado en ese momento y qué están haciendo esos usuarios. Una biblioteca necesita llevar un registro de quién tiene libros prestados y cuándo vencen. Un servidor de red puede necesitar llevar un registro de sus clientes activos. Aquí surge un patrón, que gira en torno a variaciones de lo que tradicionalmente se ha llamado estructuración de datos.
Hay estructuras de datos en la memoria de un programa en ejecución; hay estructura en los datos de un archivo en disco, y hay estructura en la información almacenada en una base de datos. En este capítulo, nos centraremos en el primer aspecto: los datos en memoria. Trataremos el segundo aspecto en el Capítulo 10; el tercero está fuera del alcance de este libro.
Si tuvieras que pensar en los datos en memoria, podrías compararlos con una ...
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