CODEWITHSUNDEEP
arraylistgson
Cemil Tatoglu
Cemil Tatoglu

Reputation: 65

Converting a JSON String To an ArrayList of Objects with GSON

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.

Upvotes: 1

Views: 7633

Answers (1)

nbokmans
nbokmans

Reputation: 5748

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.

Upvotes: 2

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