How to Map Each Column Of Json Array In Kotlin?

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To map each column of a JSON array in Kotlin, you can use the Gson library to parse the JSON string into a data class representing the structure of the JSON object. You can then iterate over the array and access each column by its corresponding property in the data class. Alternatively, you can use the kotlinx.serialization library to deserialize the JSON string into a Kotlin data class. Once you have the data class representing the JSON structure, you can easily access each column in the array using the properties of the data class.

How to serialize a JSON array in Kotlin?

To serialize a JSON array in Kotlin, you can use the Gson library. First, you need to add the Gson library to your project. You can do this by adding the following dependency in your build.gradle file:

implementation 'com.google.code.gson:gson:2.8.5'

Next, you can create a data class to represent the structure of your JSON array. For example:

data class Person(val name: String, val age: Int)

Then, you can create a list of Person objects and convert it to a JSON array using Gson:

val personList = listOf( Person("John", 30), Person("Jane", 25) )

val gson = Gson() val jsonArray = gson.toJsonTree(personList).asJsonArray

println(jsonArray)

This will print the JSON array representation of the list of Person objects.

What is JSON mapping in Kotlin?

JSON mapping in Kotlin refers to the process of converting a JSON string (or object) into a Kotlin data class or vice versa. This is often done using a library such as Gson or Moshi, which provide the necessary functionality to serialize and deserialize JSON data. By mapping JSON data to Kotlin data classes, developers can easily work with JSON data in a type-safe manner, making it easier to manipulate and use the data within their Kotlin code.

How to map JSON objects in Kotlin?

To map JSON objects in Kotlin, you can use libraries such as Gson or Jackson. Here's a simple example using Gson:

1. Add Gson dependency to your app's build.gradle file:

dependencies { implementation 'com.google.code.gson:gson:2.8.8' }

1. Create a data class that represents the structure of the JSON object:

data class Person(val name: String, val age: Int)

1. Convert JSON string to Kotlin object using Gson:

import com.google.gson.Gson

fun main() { val json = """{"name": "John", "age": 30}""" val person = Gson().fromJson(json, Person::class.java) println("Name: ${person.name}, Age: ${person.age}") }

This will output:

Name: John, Age: 30

You can also convert Kotlin object to JSON string using Gson:

fun main() { val person = Person("Jane", 25) val json = Gson().toJson(person) println(json) }

This will output:

{"name":"Jane","age":25}

This is just a basic example, but Gson and Jackson provide many more features for mapping JSON objects and handling different data structures. You can refer to their official documentation for more information on how to use them.