用Java解析JSON双括号

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

public class JsonParser {
    public static void main(String[] args) {
        String json = "[[1, 2, 3], [4, 5, 6], [7, 8, 9]]";
        
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            JsonNode jsonNode = objectMapper.readTree(json);
            
            for (JsonNode arrayNode : jsonNode) {
                for (JsonNode elementNode : arrayNode) {
                    System.out.println(elementNode.asInt());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}