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