来自JSON的java POJO表示

Question

首先请原谅我，我认为这是一个愚蠢的问题。我刚开始学java

我有一个json文件，我将其解析为POJO，以便对其进行操作

这是解析器实现

public class ParsingTweet {

public static void main(String[] args) throws IOException {
    assert args != null & args.length > 0;
    List<Tweet> tweets = new ArrayList<>();
    ObjectMapper mapper = new ObjectMapper();
    try (BufferedReader reader = new BufferedReader(new FileReader(args[0]))) {
        String line;
        while ((line = reader.readLine()) != null) {
            tweets.add(mapper.readValue(line, Tweet.class));
        }
    }
    System.out.println(tweets);
 }
}

但我的导师说这个结果不是实际的POJO。它只是一个字符串表示。比如

[[text = I think this would be good. Would hopefully light the fire in the later rounds if you knew you were losing..., created_at = Mon Mar 06 22:48:07 +0000 2017, user = User@56f4468b, coordinates = null], [text = @Night_0f_Fire He's stuck in the alimony machine,, bust him out, created_at = Mon Mar 06 22:47:53 +0000 2017, user = User@6cc4c815, coordinates = null], ..., ..., ...]]]

那么实际的POJO是什么样子的呢

以下是json的例子

2017年3月6日21:38，“文本”：“洪水/风暴/树木倒下。北部海滩（新南威尔士州英格尔赛德国王路2101号），“用户”：{“id”：“47217942”，“名称”：“新南威尔士州火灾更新”}，“朗”：“恩”，“坐标”：{“坐标”：[151.264811，-33.6848]，“类型”：“点”}，“创建于”：“Mon Mar 06 10:44:31+0000 2017”}

Answer 1

以Gson为例

String fullFile = ...read file...;
Gson gson = new Gson();
List<Tweet> tweets = gson.fromJson(fullFile, new TypeToken<ArrayList<Tweet>>(){});
System.out.println(tweets);