ajduke

public class GsonEx {
  public static void main(String[] args) throws IOException {
    Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
    String json = gson.toJson(new Developer());
    System.out.println(json);
  }
}

ajduke

class Developer {
  // this field will be included
  @Expose
  private String name;
  private  String classz;
  List<String> languagesKnown;
  
  public Developer() {
    name = "ajduke";
    languagesKnown = new ArrayList<>();

ajduke

Normal behaviour...
"\u003cmyval\u003e"

Disabled html escaping...
"<myval>"

ajduke

public class Example34 {
  public static void main(String[] args) {
    String str ="<myval>";
    Gson gson = new Gson();
    System.out.println("Normal behaviour...");
    System.out.println(gson.toJson(str));
    
    System.out.println("\nDisabled html escaping...");
    gson = new GsonBuilder().disableHtmlEscaping().create();
    System.out.println(gson.toJson(str));

ajduke

Output for version 2.0...
{"field":"field","newField1":"field 1","newField2":"field 2"}

Output for version 1.0...
{"field":"field","newField1":"field 1"}

Output for No version set...
{"field":"field","newField1":"field 1","newField2":"field 2"}

ajduke

public class Example33 {
  public static void main(String[] args) {
    Gson gson = new GsonBuilder().setVersion(2.0).create();
    String json = gson.toJson(new ExampleClass());
    System.out.println("Output for version 2.0...");
    System.out.println(json);
    
    gson= new GsonBuilder().setVersion(1.0).create();
    json = gson.toJson(new ExampleClass());
    System.out.println("\nOutput for version 1.0...");

ajduke

class Developer {
  @SerializedName("firstName")
  private String name;
  private String classz;
  List<String> languagesKnown;
  
  public Developer() {
    name = "ajduke";
    languagesKnown = new ArrayList<>();
    languagesKnown.add("Java");

ajduke

package test;

import java.util.concurrent.TimeUnit;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

ajduke

package in.ajduke.ap013;
 
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;
import com.google.gson.annotations.SerializedName;

ajduke

********* Compact mode ***********
{"firstName":"ajduke","languagesKnown":["Java","Scala","Ruby"]}

 ******* Pretty formatting *********
{
  "firstName": "ajduke",
  "languagesKnown": [
    "Java",
    "Scala",
    "Ruby"