Convert JSON Array to List of Long Type in Java
In this guide, you will learn how to convert a JSON Array into a List of Long values using the Gson library in Java.
First, install Gson library in your project.
For Maven:
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.10.1</version>
</dependency>
For Gradle:
implementation group: 'com.google.code.gson', name: 'gson', version: '2.10.1'
This code snippet demonstrates how to convert a JSON array into a List of Long values in Java:
import java.util.List;
import java.lang.reflect.Type;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
public class Example {
public static void main(String[] args) {
// Json array data
String jsonArrayExampleData = "[\"123\",\"456\",\"456\",\"232\"]";
// creating an object of Gson
Gson gson = new Gson();
// Converting to List of Long type
Type type = new TypeToken>() {}.getType();
List list = gson.fromJson(jsonArrayExampleData, type);
System.out.println(list);
}
}
The output of the above code is as follows:
[123, 456, 456, 232]
Here, in this example, the Example class contains the main method, where the JSON array data that we want to convert is defined as a string: String jsonArrayExampleData = "[\"123\",\"456\",\"456\",\"232\"]";.
In the main method, an instance of the Gson class is created: Gson gson = new Gson();. Gson is a Java library that provides methods for converting Java objects to JSON and vice versa. To convert the JSON array to a List of Long values, a Type object is defined using the TypeToken class: Type type = new TypeToken