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How to convert map to json string using Gson APIs?


This page shows how to convert map object to json string using Google gson API.

Note: Refer How to convert java object to json string using Gson APIs? page for dependent libraries.

Here is the example to convert map to json string:

package com.java2novice.json.gson;

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

import com.google.gson.Gson;

public class MapToJsonEx {

	public static void main(String a[]){
		
		Gson gsonObj = new Gson();
		Map<String, String> inputMap = new HashMap<String, String>();
		inputMap.put("name", "Java2Novice");
		inputMap.put("site", "http://java2novice.com");
		// convert map to JSON String
		String jsonStr = gsonObj.toJson(inputMap);
		System.out.println(jsonStr);
	}
}

Output:
{"site":"http://java2novice.com","name":"Java2Novice"}
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Transient and Volatile Modifiers
Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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