Write JSON to file in Java using Gson

To parse JSON using Gson library, you need to use gson-2.9.0 jar

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.9.0</version>
</dependency>

Java class used to represent the JSON

import java.util.List;
    
public class Student {
    
    private int id;
    private String name;
    private int age;
    private List<String> emailaddress;
        
    // removed getter and setter      
    
    @Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ","
            +" age=" + age + ", emailaddress=" + emailaddress + "]";
	}    
    
}    

Create Java object and write it to file in JSON format.

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
	
public class TestGsonFileWriter {
    public static void main(String[] args) {
                
        Student student = new Student();
        student.setId(123);
        student.setName("George Bush");
        student.setAge(40);
        
        List<String> emailaddress = new ArrayList<>();
        emailaddress.add("jbush@yahoo.com");
        emailaddress.add("jbush@gmail.com");
        student.setEmailaddress(emailaddress);
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        
        try (FileWriter writer = new FileWriter("E:\\student.json")) {
            gson.toJson(student, writer);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}	

Output :

{
  "id": 123,
  "name": "George Bush",
  "age": 40,
  "emailaddress": [
    "jbush@yahoo.com",
    "jbush@gmail.com"
  ]
}