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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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Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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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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