How to iterate through a JSONArray in Java to retrieve data and compare it?

To iterate over a JSONArray in Java, retrieve data and compare it, follow these steps:

1. Import the necessary dependencies, such as the json library (such as fastjson or json-simple).
2. Parse the JSON string into a JSONArray object using the json library.
3. Traverse through the JSONArray object and retrieve each JSONObject one by one.
4. Retrieve the fields to be compared in the JSONObject and perform the comparison operation.

The sample code is shown below (using the fastjson library):

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class Main {
    public static void main(String[] args) {
        // 假设json字符串为 [{"name": "Alice", "age": 25}, {"name": "Bob", "age": 30}]
        String jsonString = "[{\"name\": \"Alice\", \"age\": 25}, {\"name\": \"Bob\", \"age\": 30}]";

        // 解析为JSONArray对象
        JSONArray jsonArray = JSONArray.parseArray(jsonString);

        // 遍历JSONArray对象
        for (int i = 0; i < jsonArray.size(); i++) {
            // 获取JSONObject
            JSONObject jsonObject = jsonArray.getJSONObject(i);

            // 获取需要比对的字段
            String name = jsonObject.getString("name");
            int age = jsonObject.getInteger("age");

            // 比对操作
            if (name.equals("Alice")) {
                System.out.println("Alice's age is " + age);
            } else if (name.equals("Bob")) {
                System.out.println("Bob's age is " + age);
            }
        }
    }
}

The code above demonstrates how to loop through a JSONArray to retrieve data and perform comparison operations. Depending on the specific situation, the comparison logic can be modified as needed.