package com.mkyong;

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import com.fasterxml.jackson.databind.ObjectMapper;

​

import java.io.IOException;

import java.util.Map;

​

public class JacksonMapExample1 {

​

    public static void main(String[] args) {

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        ObjectMapper mapper = new ObjectMapper();

        String json = "{\"name\":\"mkyong\", \"age\":\"37\"}";

​

        try {

​

            // convert JSON string to Map

            Map<String, String> map = mapper.readValue(json, Map.class);

​

            // it works

            //Map<String, String> map = mapper.readValue(json, new TypeReference<Map<String, String>>() {});

​

            System.out.println(map);

​

        } catch (IOException e) {

            e.printStackTrace();

        }

​

    }

}

ObjectMapper objectMapper = new ObjectMapper();

String json = "{ \"color\" : \"Black\", \"type\" : \"BMW\" }";

Car car = objectMapper.readValue(json, Car.class);  

import com.google.gson.Gson;

import java.lang.reflect.Type;

import java.util.Map;

​

public class JsonToMapExample {

    public static void main(String[] args) {

        String jsonString = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}";

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        // Create a Gson instance

        Gson gson = new Gson();

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        // Define the type of the Map

        Type mapType = Map.class;

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        // Convert the JSON string to a Map

        Map<String, Object> map = gson.fromJson(jsonString, mapType);

​

        // Print the map

        for (Map.Entry<String, Object> entry : map.entrySet()) {

            System.out.println(entry.getKey() + ": " + entry.getValue());

        }

    }

}