How to check numbers of property in Kotlin data class?

user_190309 0
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As the title, I want to check how many properties in a Kotlin data class. Its use case is to ensure the Mapper from DTO to Data Model is implemented correctly.

data-class kotlin
2 Answers

By default reflection library is not addend in kotlin standard library to reduce the size, if we need to use reflection we need to add that library explicitly which can be done by adding 

    runtime group: 'org.jetbrains.kotlin', name: 'kotlin-reflect'

to your dependencies.

And for getting members of a data class we can now use

DataClassExample::class.members

If u don't want to add any extra library u can use java Reflection, which is generally not recommended

DataClassExample::class.java.declaredFields
user_30446800

You can use java reflection for it like this:

Test::class.java.declaredFields.size
user_15546330
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