将JSON列表转换为GSON中的不同Java对象 [英] Converting JSON list as different Java Objects in GSON

问题描述

我有以下json字符串：

I have the following json string:

[
    {
        "question" : {
            "questionId" : 1109,
            "courseId" : 419
        },
        "tags" : ["PPAP", "testtest"],
        "choices" : [{
                "choiceId" : 0,
                "questionId" : 0
            }, {
                "choiceId" : 0,
                "questionId" : 0
            }
        ]
    }
]

我该如何制作问题，标记和选择使用GSON分隔对象？目前，我只使用 fromJson ，并且只能转换JSON字符串，如果它只包含1种类型的对象。

How do I make question, tags, and choices into separate objects using GSON? Currently I only use fromJson and can only convert a JSON string if it only contains 1 type of object.

推荐答案

您可以拥有以下类：

You can have following classes

class Question{
   questionId; //specify data type 
   courseId;
}
class Choice{
   choiceId;
   questionId;
}

然后你可以再定义一个类来存放所有三个成员变量

Then you can define one more class which will hold all the three member variables

class Extract{
 Question question;
 List<String> tags;
 List<Choice> choices;
} 

然后，您可以将此Extract类传递给 fromJson 方法，如

Then you can pass this Extract class to fromJson method like

List<Extract> result = gson.fromJson(jsonString, new TypeToken<List<Extract>>(){}.getType());

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