I am trying to load my Json into my class
public User() {
this.fbId = 0;
this.email = "";
this.name = "";
this.thumb = "";
this.gender = "";
this.location = "";
this.relationship = null;
this.friends = new ArrayList();
}
{
users:{
user:{
name:'the name',
email:'',
friends:{
user:{
name:'another name',
email:'',
friends:{
user:{
name:'yet another name',
email:''
}
}
}
}
}
}
}
I am struggling to get GSON to load the user details into the above Java object with the following code
User user = gson.fromJson(this.json, User.class);
1 Answer
The JSON is invalid. A collection is not to be represented by {}. It stands for an object. A collection/array is to be represented by [] with commaseparated objects.
Here's how the JSON should look like:
{
users:[{
name: "name1",
email: "email1",
friends:[{
name: "name2",
email: "email2",
friends:[{
name: "name3",
email: "email3"
},
{
name: "name4",
email: "email4"
}]
}]
}]
}
(note that I added one more friend to the deepest nested friend, so that you understand how to specify multiple objects in a collection)
Given this JSON, your wrapper class should look like this:
public class Data {
private List<User> users;
// +getters/setters
}
public class User {
private String name;
private String email;
private List<User> friends;
// +getters/setters
}
and then to convert it, use
Data data = gson.fromJson(this.json, Data.class);
and to get the users, use
List<User> users = data.getUsers();
