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How can we convert a map to the JSON object in Java?
The JSON is a lightweight, text-based and language-independent data exchange format. The JSON can represent two structured types like objects and arrays. An object is an unordered collection of key/value pairs and an array is an ordered sequence of values.
We can convert a Map to JSON object using the toJSONString() method(static) of org.json.simple.JSONValue. It has two important static methods: writeJSONString() method to encode an object into JSON text and write it out, escape() method to escape the special characters and escape quotes, \, /, \r, \n, \b, \f, \t.
Example
import java.util.*; import org.json.simple.JSONValue; public class ConvertMapJSONTest { public static void main(String[] args) { Map<String, Object> map = new HashMap<String, Object>(); map.put("1", "India"); map.put("2", "Australia"); map.put("3", "England"); map.put("4", "South Africa"); String jsonStr = JSONValue.toJSONString(map); // converts Map to JSON System.out.println(jsonStr); } }
Output
{"1":"India","2":"Australia","3":"England","4":"South Africa"}
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