Gson, how to deserialize array or empty string

Question

I trying to deserialize this json to array of objects:

[{
    \"name\": \"item 1\",
    \"tags\": [\"tag1\"]
},
{
    \"name\": \"item 2\",
    \"tags\": [\"         


        

Answer 1

Use GSON's fromJson() method to de serialize your JSON.

You can better understand this by the example given below:

import java.util.ArrayList;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

public class JsonToJava {

/**
 * @param args
 */
public static void main(String[] args) {
    String json = "[{\"firstName\":\"John\", \"lastName\":\"Doe\", \"id\":[\"10\",\"20\",\"30\"]},"
            + "{\"firstName\":\"Anna\", \"lastName\":\"Smith\", \"id\":[\"40\",\"50\",\"60\"]},"
            + "{\"firstName\":\"Peter\", \"lastName\":\"Jones\", \"id\":[\"70\",\"80\",\"90\"]},"
            + "{\"firstName\":\"Ankur\", \"lastName\":\"Mahajan\", \"id\":[\"100\",\"200\",\"300\"]},"
            + "{\"firstName\":\"Abhishek\", \"lastName\":\"Mahajan\", \"id\":[\"400\",\"500\",\"600\"]}]";

    jsonToJava(json);
}

private static void jsonToJava(String json) {
    Gson gson = new Gson();
    JsonParser parser = new JsonParser();
    JsonArray jArray = parser.parse(json).getAsJsonArray();

    ArrayList lcs = new ArrayList();

    for (JsonElement obj : jArray) {
        POJO cse = gson.fromJson(obj, POJO.class);
        lcs.add(cse);
    }
    for (POJO pojo : lcs) {
        System.out.println(pojo.getFirstName() + ", " + pojo.getLastName()
                + ", " + pojo.getId());
    }
}

}

POJO class:

public class POJO {

  private String        firstName;
  private String        lastName;
  private String[]  id;
  //Getters and Setters.

I hope this will solve your issue.