Java json parser with Jackson library

JsonParser.java

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonParserIterator {
  public static void main(String[] args) throws IOException {
    String json = "{ \"fx\": [{ \"pk\": \"ALL=\" }, { \"pk\": \"EUR=\" }] }";
    
    ObjectMapper mapper = new ObjectMapper();
    JsonNode root = mapper.readTree(json);

    Iterator<JsonNode> elements = root.get("fx").elements();
    while (elements.hasNext()) {
      JsonNode element = elements.next();
      String pk = element.get("pk").asText();
      System.out.println(pk);
    }
  }
}