获取JSON数组中的第一个实例JAVA

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class Main {
    public static void main(String[] args) {
        String jsonStr = "[{\"name\":\"John\", \"age\":30}, {\"name\":\"Jane\", \"age\":25}]";

        try {
            JSONArray jsonArray = new JSONArray(jsonStr);
            if (jsonArray.length() > 0) {
                JSONObject firstInstance = jsonArray.getJSONObject(0);
                System.out.println("First instance: " + firstInstance.toString());
                // 可以根据需要获取实例中的具体字段值
                String name = firstInstance.getString("name");
                int age = firstInstance.getInt("age");
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
            } else {
                System.out.println("JSON数组为空");
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}