How to convert a JSON object to an enum using Jackson in Java?

A JSONObject can parse the text from String to produce a Map kind of an object. An Enum can be used to define a collection of constants, when we need a predefined list of values which do not represent some kind of numeric or textual data then we can use an enum. We can convert a JSON object to an enum using the readValue() method of ObjectMapper class.

In the below example, we can convert/deserialize a JSON object to Java enum using the Jackson library.

Example

import com.fasterxml.jackson.databind.*; public class JSONToEnumTest {    public static void main(String arg[]) throws Exception {       ObjectMapper mapper = new ObjectMapper();       Employee emp = mapper.readValue("{\"jobType\":\"CONTRACT\"}", Employee.class);       System.out.println(emp.getJobType());    }    public static class Employee {       private JobType jobType;       public JobType getJobType() {          return jobType;       }       public void setJobType(JobType jobType) {          this.jobType = jobType;       }    }    public enum JobType {       PERMANENT,       CONTRACT,    } }

Output

CONTRACT