
- Java Tutorial
- Java - Home
- Java - Overview
- Java - Environment Setup
- Java - Basic Syntax
- Java - Object & Classes
- Java - Constructors
- Java - Basic Datatypes
- Java - Variable Types
- Java - Modifier Types
- Java - Basic Operators
- Java - Loop Control
- Java - Decision Making
- Java - Numbers
- Java - Characters
- Java - Strings
- Java - Arrays
- Java - Date & Time
- Java - Regular Expressions
- Java - Methods
- Java - Files and I/O
- Java - Exceptions
- Java - Inner classes
- Java Object Oriented
- Java - Inheritance
- Java - Overriding
- Java - Polymorphism
- Java - Abstraction
- Java - Encapsulation
- Java - Interfaces
- Java - Packages
- Java Advanced
- Java - Data Structures
- Java - Collections
- Java - Generics
- Java - Serialization
- Java - Networking
- Java - Sending Email
- Java - Multithreading
- Java - Applet Basics
- Java - Documentation
- Java Useful Resources
- Java - Questions and Answers
- Java - Quick Guide
- Java - Useful Resources
- Java - Discussion
- Java - Examples
Convert a list of objects to JSON using the Gson library in Java?
A Gson is a library that can be used to convert Java Objects to JSON representation. It can also be used to convert a JSON string to an equivalent Java object. The primary class to use is Gson which we can create by calling the new Gson() and the GsonBuilder class can be used to create a Gson instance.
We can convert a list of objects by first creating a Person class and convert a list of Person objects to JSON.
Example
import java.util.*; import java.util.stream.*; import com.google.gson.*; public class JSONConverterTest { public static void main( String[] args ) { Gson gson = new GsonBuilder().setPrettyPrinting().create(); List list = Stream.of(new Person("Raja", "Ramesh", 30, "9959984800"), new Person("Jai", "Dev", 25, "7702144400"), new Person("Adithya", "Sai", 21, "7013536200"), new Person("Chaitanya", "Sai", 28, "9656444150")) .collect(Collectors.toList()); System.out.println("Convert list of person objects to Json:"); String json = gson.toJson(list); // converts to json System.out.println(json); } } // Person class class Person { private String firstName, lastName, contact; private int age; public Person(String firstName, String lastName, int age, String contact) { this.firstName = firstName; this.lastName = lastName; this.age = age; this.contact = contact; } public String toString() { return "[" + firstName + " " + lastName + " " + age + " " +contact +"]"; } }
Output
Convert list of person objects to Json: [ { "firstName": "Raja", "lastName": "Ramesh", "contact": "9959984800", "age": 30 }, { "firstName": "Jai", "lastName": "Dev", "contact": "7702144400", "age": 25 }, { "firstName": "Adithya", "lastName": "Sai", "contact": "7013536200", "age": 21 }, { "firstName": "Chaitanya", "lastName": "Sai", "contact": "9656444150", "age": 28 } ]
- Related Articles
- Convert a Map to JSON using the Gson library in Java?
- Convert Java object to JSON using the Gson library in Java?\n
- How to convert Java object to JSON using GSON library?
- Convert JSON object to Java object using Gson library in Java?\n
- How to pretty print JSON using the Gson library in Java?
- How to write a JSON string to file using the Gson library in Java?
- How to convert a List to JSON array using the Jackson library in Java?
- Convert a JSON String to Java Object using the json-simple library in Java?\n
- Convert CSV to JSON using the Jackson library in Java?\n
- Convert JSON to/from Map using Jackson library in Java?
- How to convert a JSON to Java Object using the Jackson library in Java?\n
- How to convert HASHMAP to JSON using GSON in Android?
- How to convert Java object to JSON using Jackson library?
- How to format a date using the Gson library in Java?
- How to rename the properties of JSON using Gson in Java?

Advertisements