BE THE CODER > JSON > GOOGLE GSON Examples

Google-gson is a java library from Google for encoding and decoding JSON text. Get the latest binaries from http://code.google.com/p/google-gson/. The following example shows serializing and de-serializing generic types.

File Name :	com/bethecoder/tutorials/google_gson/tests/GenericTypes.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.google_gson.tests;



import java.lang.reflect.Type;

import java.util.Arrays;

import java.util.List;



import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

import com.google.gson.reflect.TypeToken;



public class GenericTypes {



  /**

   * @param args

   */

  public static void main(String[] args) {

    Gson gson = new GsonBuilder().setPrettyPrinting().create();



    List<String> strings = Arrays.asList("ONE", "TWO", "THREE", "FOUR");

    String jsonStr = gson.toJson(strings);

    System.out.println(jsonStr); //We loose the type info once we serialize to JSON string

  

    //Specify the explicit type for de-serialization

    Type listType = new TypeToken<List<String>>() {}.getType();

    strings = gson.fromJson(jsonStr, listType);

    System.out.println(strings);

  }



}

Generic Types