Explicación del patrón Builder y ejemplo

En este artículo, vamos a explicar la finalidad de Builder.


Builder es un patrón, es decir, una manera de hacer las cosas. Concretamente, nos permite realizar el encadenamiento de sus métodos (por ejemplo los setters) en la misma declaración del objeto.


Para construir objetos, realmente ya sabemos que existen los constructores. Si el constructor tiene argumentos, podremos construirlos desde el propio constructor. En cambio, si está vacío, deberemos de añadirle los valores mediante a setters.

Builer, por decirlo así combina la creación de un objeto con los setters pero de una manera diferente a los constructores. Dándole una verbosidad a todo esto. Y nace con la finalidad de disminuir la complejidad, otorgándole al código una mejor legibilidad, claridad y compresibilidad.



Primeramente creamos la clase Employee con sus atributos, un constructor con todos los parámetros y finalmente los getters y setters.


Creamos los atributos, el constructor vacío, setters y el build que creará el objeto


En el Main, ahora creamos dos objetos y si os fijáis, utilizando la “verbosera” de setters y finalmente encadenando con build podemos utilizar la especie de constructor que acabamos de construir.


Espero que os haya gustado. ¡Un saludo javeros!

75 comentarios

  1. Una pregunta, cual es la ventaja de hacerlo con este patrón? Ya que hay que escribir más código. La verdad no entiendo

    • admin

      15 diciembre, 2020 a las 16:29

      Buenas tardes Henry,

      Te dejo un párrafo sacado de la Wikipedia en el que me apoyo para explicartelo mejor:

      Los patrones de diseño son unas técnicas para resolver problemas comunes en el desarrollo de software y otros ámbitos referentes al diseño de interacción o interfaces.

      Un patrón de diseño resulta ser una solución a un problema de diseño. Para que una solución sea considerada un patrón debe poseer ciertas características. Una de ellas es que debe haber comprobado su efectividad resolviendo problemas similares en ocasiones anteriores. Otra es que debe ser reutilizable, lo que significa que es aplicable a diferentes problemas de diseño en distintas circunstancias.

      Con ello, nos referimos que es una manera una tecnica mediante a la cual poder resolver determinados problemas durante el desarrollo. Aunque esto no significa que sea ni la única ni la mejor mejor manera de realizar las tareas. Un saludo

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