Using GSON to parse a JSON array

Question

I have a JSON file like this                    number    3            title    hello world                     number    2            title    hello world             Before when files had a root element I would use   Wrapper w   gson fromJson JSONSTRING  Wrapper class     code but I can t think how to code the Wrapper class as the root element is an array   I have tried using   Wrapper   wrapper   gson fromJson jsonLine  Wrapper   class     with    public class Wrapper       String number      String title       But haven t had any luck  How else can I read this using this method   P S I have got this to work using    JsonArray entries    JsonArray  new JsonParser   parse jsonLine   String title     JsonObject entries get 0   get  title      But I would prefer to know how to do it  if possible  with both methods

User · Accepted Answer

Problem is caused by comma at the end of (in your case each) JSON object placed in the array:

{
    "number": "...",
    "title": ".." ,  //<- see that comma?
}

If you remove them your data will become

[
    {
        "number": "3",
        "title": "hello_world"
    }, {
        "number": "2",
        "title": "hello_world"
    }
]

and

Wrapper[] data = gson.fromJson(jElement, Wrapper[].class);

should work fine.

User · Answer

Wrapper   data   gson fromJson jElement  Wrapper   class

User · Answer

Gson gson   new Gson    Wrapper   arr   gson fromJson str  Wrapper   class    class Wrapper      int number      String title             Seems to work fine  But there is an extra   Comma in your string                     number     3            title     hello world                         number     2            title     hello world

User · Answer

public static  lt T gt  List lt T gt  toList String json  Class lt T gt  clazz        if  null    json            return null            Gson gson   new Gson        return gson fromJson json  new TypeToken lt T gt      getType         sample call   List lt Specifications gt  objects   GsonUtils toList products  Specifications class

[java] Using GSON to parse a JSON array

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