如何从java上的json列表中获取选定值

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

public class JsonParsingExample {
    public static void main(String[] args) {
        String json = "{\"employees\":[{\"firstName\":\"John\", \"lastName\":\"Doe\"}, {\"firstName\":\"Anna\", \"lastName\":\"Smith\"}]}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            JsonNode rootNode = objectMapper.readTree(json);

            JsonNode employeesNode = rootNode.get("employees");
            if (employeesNode.isArray()) {
                for (JsonNode employeeNode : employeesNode) {
                    String firstName = employeeNode.get("firstName").asText();
                    String lastName = employeeNode.get("lastName").asText();
                    System.out.println("First Name: " + firstName);
                    System.out.println("Last Name: " + lastName);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}