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Ibrahim Hernández Jorge
Asked: 2020-03-28 02:13:33 +0800 CST 2020-03-28 02:13:33 +0800 CST

Get attributes of a class without sorting alphabetically in Java (or Kotlin)

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My idea is to obtain all the attributes of a class from an instance of an object of that class, but when obtaining the collection of attributes, it stores them for me in alphabetical order and I want it to be returned to me in the order that they are defined in the builder.

This is my class:

class Empresa(override var id: Long = Long.MIN_VALUE, var uuid: String = "", var nombre : String = "")

And when doing:

var atributos = Empresa().javaClass.kotlin.memberProperties.toString()

I returned:

[id, nombre, uuid]

And the idea is that it returns as it is defined in the constructor (that it does not order them alphabetically):

[id, uuid, nombre]

Any ideas?

java

1 Answers

  1. Best Answer

    I think it's not possible. And it doesn't return them alphabetically, they just don't have a specific order, this case is a coincidence. You can see the java documentationgetDeclaredFields , which clearly says:

    The elements in the returned array are not sorted and are not in any particular order.

    Translated:

    The elements in the returned array are not sorted and are in no particular order.

    edited

    Apparently, despite what the documentation says, getDeclaredFieldsit does normally return the fields in declaration order (see this answer ). However, this is not 100% accurate, and it is probably best to disregard this order and check the field names.

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