Retrofit get request with nested json object

Create the following model classes,

public class ReferralRequestBody {    @SerializedName("state")    @Expose    private String state;    @SerializedName("filters")    @Expose    private Filters filters;    public String getState() {    return state;    }    public void setState(String state) {    this.state = state;    }    public Filters getFilters() {    return filters;    }    public void setFilters(Filters filters) {    this.filters = filters;    }    }

Also, create this,

public class Filters {    @SerializedName("page")    @Expose    private Integer page;    @SerializedName("filter")    @Expose    private String filter;    public Integer getPage() {    return page;    }    public void setPage(Integer page) {    this.page = page;    }    public String getFilter() {    return filter;    }    public void setFilter(String filter) {    this.filter = filter;    }    }

Then set the data for the state, filter like,

ReferralRequestBody referralrequestbody=new ReferralRequestBody();referralrequestbody.setState("state");Filters filters=new Filters();filters.setPage("page data");filters.setFilter("filter data");

and call the function as,

@GET("/api/data") Observable<APIResponse> getData(                           @Body ReferralRequestBody referralrequestbody);