How can we convert a JSON array to a list using Jackson in Java?

A Jackson is a Java-based library and it can be useful to convert Java objects to JSON and JSON to Java Object. A Jackson API is faster than other API, needs less memory area and is good for the large objects. We can convert a JSON array to a list using the ObjectMapper class. It has a useful method readValue() which takes a JSON string and converts it to the object class specified in the second argument.

Example

import java.util.*;
import com.fasterxml.jackson.databind.*;

public class JSONArrayToListTest1 {
   public static void main(String args[]) {
      String jsonStr = "[\"INDIA\", \"AUSTRALIA\", \"ENGLAND\", \"SOUTH AFRICA\", \"WEST INDIES\"]";
      ObjectMapper objectMapper = new ObjectMapper();
      try {
         List<String> countries = objectMapper.readValue(jsonStr, List.class);
         System.out.println("The countries are:\n " + countries);
      } catch(Exception e) {
         e.printStackTrace();
      }
   }
}

Output

The countries are:
[INDIA, AUSTRALIA, ENGLAND, SOUTH AFRICA, WEST INDIES]

Raja

Published on 11-Oct-2019 17:50:08