Converting a JSON String To an ArrayList of Objects with GSON

Question

We have the following json string:

jsonUserDataRecs=[{"G_ID1":1,"G_ID2":2,"G_ID3":3,"NAME":"g1"},{"G_ID1":4,"G_ID2":5,"G_ID3":5,"NAME":"g2"}]

Would like to convert it into the following data type:

ArrayList<USER_DATA_REC> userDataRecs;

We tried the following, but did not get any results:

userDataRecs = gson.fromJson(jsonUserDataRecs, new TypeToken<ArrayList<USER_DATA_REC>>() {}.getType());

When we run : userDataRecs.get(0).getNAME(), we did not get any results.

Any help will be greatly appreciated.

Thank you.

Possible duplicate of Google Gson - deserialize list<class> object? (generic type) — Lyubomyr Shaydariv
– Lyubomyr Shaydariv, Commented Apr 11, 2017 at 11:58
what error do you get? And please share your USER_DATA_REC class — misman
– misman, Commented Apr 11, 2017 at 11:59

nbokmans · Accepted Answer · 2017-04-11 11:52:39Z

2

First make a POJO class:

public class UserDataRecord {
    public int G_ID1;
    public int G_ID2;
    public int G_ID3;
    public String NAME;
    public String getNAME() {
        return NAME;
    }
}

Next use gson to deserialize your json string like so:

UserDataRecord[] userDataRecords = gson.fromJson(jsonUserDataRecs, UserDataRecord[].class);

Now you have an array of the deserialized user data records. You can manually convert this to a list if you need to, or just iterate it using a normal for loop.

answered Apr 11, 2017 at 11:52

nbokmans

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1 Comment

Adnan haider Over a year ago

if i have multiple class inside parent class then what can i do to get the value of child classes?

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