使用JSONObject从JSON (Map<String，Object>)中获取值

import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // 创建一个 Map 对象
        Map<String, Object> map = new HashMap<>();
        map.put("name", "John");
        map.put("age", 30);
        map.put("isStudent", false);

        // 将 Map 转换为 JSONObject
        JSONObject jsonObject = new JSONObject(map);

        // 从 JSONObject 中获取值
        String name = jsonObject.getString("name");
        int age = jsonObject.getInt("age");
        boolean isStudent = jsonObject.getBoolean("isStudent");

        // 输出获取的值
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Is Student: " + isStudent);
    }
}

String name = jsonObject.optString("name", "defaultName");

int age = jsonObject.getInt("age");

if (jsonObject != null) {
    String name = jsonObject.getString("name");
}