JSONObjectis an unordered collection ofname/valuepairs, whileMapis a mapping key Objects to values. The map cannot containduplicatekeys, and each key can be mapped to at most one value. We need to use theJSON-liblibrary toserializeanddeserializethe map in JSON format. Initially, we can create a POJO class and pass the instance as parameter to theput()method of theMapclass and finally add this map instance to theaccumulateAll JSONObject Methods.
Syntaxpublic void accumulateAll(Map map)
import java.util.*; import net.sf.json.JSONObject; public class ConvertMapToJSONObjectTest { public static void main(String[] args)throws Exception { JSONObject jsonObject = new JSONObject(); Mapemployees = new HashMap (); employees.put(1, new Employee("Adithya", "Jai", 30)); employees.put(2, new Employee("Vamsi", "Krishna", 28)); employees.put(3, new Employee("Chaitanya", "Sai", 30)); jsonObject.accumulateAll(employees); System.out.println(jsonObject.toString(3)); // pretty print JSON } public static class Employee { private String firstName, lastName; private int age; public Employee(String firstName, String lastName, int age) { super(); this.firstName = firstName; this.lastName = lastName; this.age = age; } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } public int getAge() { return age; } } }
{ "1": { "firstName": "Adithya", "lastName": "Jai", "age": 30 }, "2": { "firstName": "Vamsi", "lastName": "Krishna", "age": 28 }, "3": { "firstName": "Chaitanya", "lastName": "Sai", "age": 30 } }
The above is the detailed content of How to convert Map to JSON object using JSON-lib API in Java?. For more information, please follow other related articles on the PHP Chinese website!