java - 错误: non-static method get(Object) cannot be referenced from a static context

Question

下面的代码显示:

JavaApplication1.java:34: error: non-static method get(Object) cannot be referenced from a static contextJSONArray cars = (JSONArray) JSONObject.get("cars");                                                      

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class JavaApplication1 {

    @SuppressWarnings("unchecked")
    public static void main(String[] args) {

        JSONParser parser = new JSONParser();

        try {
            JSONArray a = (JSONArray) parser.parse(new FileReader("C:/Users/Glambert/Dropbox/java/New folder/perfection/UPdate/json.txt"));

            for (Object o : a)
            {
                JSONObject person = (JSONObject) o;

                String name = (String) person.get("name");
                System.out.println(name);

                String city = (String) person.get("city");
                System.out.println(city);

                String job = (String) person.get("job");
                System.out.println(job);

                JSONArray cars = (JSONArray) JSONObject.get("cars");

                for (Object c : cars)
                {
                    System.out.println(c+"");
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

有人知道为什么会出现这种情况吗？

(顺便说一句，这段代码是在网上找到的，我对其进行了编辑以测试运行，以便我可以创建一个新代码来接收不同类型的txt文件。)

项目:来自 StackOverflow 页面的代码 How to read json file into java with simple JSON library

代码作者:https://stackoverflow.com/users/1212960/greg-kopff

Answer 1

检查这一行

 JSONArray cars = (JSONArray) JSONObject.get("cars");

更改它

 JSONArray cars = (JSONArray) person.get("cars");

问题是因为您直接在类上调用 get 方法。