ajduke

toJson ---
Original Java object : ModelObject [name=myname, val=12, status=true, f=2.3]
Converted JSON string is : {"name":"myname","val":12,"status":true,"f":2.3}
fromJson----
Original JSON string is : {"name":"myname","val":12,"status":true,"f":2.3}
Converted Java object : ModelObject [name=myname, val=12, status=true, f=2.3]

ajduke

package in.ajduke.ap012;
/**
* An model for gson demo 
* 
* @author ajduke
*/
public class ModelObject {
  String name;
  int val;
  boolean status;

ajduke

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.2.4</version>
</dependency>

ajduke

repositories {
    mavenCentral()
}
 
dependencies {
    compile 'com.google.code.gson:gson:2.2.4'
}

ajduke

package in.ajduke.ap012;
/**
* An generified model for demo of gson conversion 
* @author ajduke
*/
public class GenericModel<T> {
  T value;
  
  public GenericModel(T value) {
    super();

ajduke

Gson gson = new Gson();

System.out.println("A generic object demo");
// a generified object
GenericModel<Integer> model = new GenericModel<>(12);

// converting to json representation
String json = gson.toJson(model);
System.out.println("json representation :" + json);

ajduke

A generic object demo
json representation :{"value":12}
converted object representation: Model2 [value=12]
 
A object from collection framework
 
json representation :["ajduke","ajduchess"]
converted object representation: [ajduke, ajduchess]

ajduke

package in.ajduke.ap012;
/**
* An model for demo of gson conversion 
* 
* @author ajduke
*/
public class ModelObject {
  String name;
  transient int val;
  boolean status;

ajduke

Gson gson = new Gson();
// original object
ModelObject modelObject = new ModelObject("namesake", 50, true, 4.3);
System.out.print("Original Java object : ");
System.out.println(modelObject);

// converting to an json representation
String json = gson.toJson(modelObject);
System.out.print("Converted JSON string is : ");
System.out.println(json);

ajduke

Original Java object : ModelObject [name=namesake, val=50, status=true, f=4.3]
Converted JSON string is : {"name":"namesake","status":true,"f":4.3}
Converted Java object : ModelObject [name=namesake, val=0, status=true, f=4.3]