How to convert JSON object to enum type in Java using Jackson?

JSONObject can parse the text in a string to generate an object of type Map. Enumerations can be used to define constant collections . We can use enumerations when we need a predefined list of values ​​that does not represent some kind of numeric or text data. We can convert a JSON object into an enumeration using the readValue() method of the ObjectMapper class.

In the example below, we can use the Jackson library to convert/deserialize a JSON object into a Java enumeration.

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

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