gson : SerializedName annotation

This annotation indicates this member should be serialized to JSON with the provided name value as its field name.

public class Address {
    private String street;
    private String city;
    private String state;
    private String country;
    private String PIN;

    public String getPIN() {
        return PIN;
    }

    public String getCity() {
        return city;
    }

    public String getCountry() {
        return country;
    }

    public String getState() {
        return state;
    }

    public String getStreet() {
        return street;
    }

    public void setPIN(String PIN) {
        this.PIN = PIN;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public void setState(String state) {
        this.state = state;
    }

    public void setStreet(String street) {
        this.street = street;
    }
}

import java.util.*;
import com.google.gson.annotations.SerializedName;

public class Employee {
    @SerializedName("empId")
    private int id;

    @SerializedName("fName")
    private String firstName;

    @SerializedName("lName")
    private String lastName;
    
    private String designation;
    private String mailId;
    private List<String> hobbies;

    @SerializedName("address")
    private Address addr;

    public String getDesignation() {
        return designation;
    }

    public int getId() {
        return id;
    }

    public void setDesignation(String designation) {
        this.designation = designation;
    }

    public void setId(int id) {
        this.id = id;
    }
    
   
    public Address getAddr() {
        return addr;
    }

    public String getFirstName() {
        return firstName;
    }

    public List<String> getHobbies() {
        return hobbies;
    }

    public String getLastName() {
        return lastName;
    }

    public String getMailId() {
        return mailId;
    }

    public void setAddr(Address addr) {
        this.addr = addr;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setHobbies(List<String> hobbies) {
        this.hobbies = hobbies;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public void setMailId(String mailId) {
        this.mailId = mailId;
    }

}

import com.google.gson.*;
import java.util.*;

public class ObjectToJson {
    public static void main(String args[]){
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        //Gson gson = new Gson();

        Employee emp3 = new Employee();
        Address addr2 = new Address();
        addr2.setCity("Bangalore");
        addr2.setCountry("India");
        addr2.setPIN("560047");
        addr2.setState("Karnataka");
        addr2.setStreet("Marthalli");
        emp3.setAddr(addr2);
        emp3.setFirstName("Rama Krishna");
        List<String> hobbies3 = new ArrayList<String> ();
        hobbies3.add("Reading editorial news");
        hobbies3.add("climbing hills");
        hobbies3.add("chat with friends");

        emp3.setHobbies(hobbies3);
        emp3.setLastName("Gurram");
        emp3.setMailId("asdfgh@wxyz.com");
        emp3.setId(75);
        emp3.setDesignation("Tech lead");

        String str = gson.toJson(emp3);
        System.out.println(str);
    }
}

Output

{
  "empId": 75,
  "fName": "Rama Krishna",
  "lName": "Gurram",
  "designation": "Tech lead",
  "mailId": "asdfgh@wxyz.com",
  "hobbies": [
    "Reading editorial news",
    "climbing hills",
    "chat with friends"
  ],
  "address": {
    "street": "Marthalli",
    "city": "Bangalore",
    "state": "Karnataka",
    "country": "India",
    "PIN": "560047"
  }
}

Observe the output, firstName displayed as fName, lastName as lName, id as empId and addr as address.

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