Gson: Convert HashMap to json string

Following snippet converts HashMap to json object.

Gson gson = new Gson();

Map<String,String> countriesAndCapitals = new HashMap<> ();

String json = gson.toJson(countriesAndCapitals);

App.java

package com.sample.app;

import java.util.HashMap;
import java.util.Map;

import com.google.gson.Gson;

public class App {

 public static void main(String args[]) {
  Gson gson = new Gson();

  Map<String, String> countriesAndCapitals = new HashMap<>();

  countriesAndCapitals.put("India", "Delhi");
  countriesAndCapitals.put("Nepal", "Katmandu");
  countriesAndCapitals.put("Canada", "Ottawa");

  String json = gson.toJson(countriesAndCapitals);

  System.out.println(json);
 }

}

Output

{"Canada":"Ottawa","Nepal":"Katmandu","India":"Delhi"}

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