Parse nested generics， Pleae Help me

@Data
@ToString(callSuper = true)
public class PageResult<T> extends Result<Collection<T>> {
    private static final long serialVersionUID = 1L;
    private long total;
    private int page;
    private int size;
    private Collection<T> data;
    private int status;
    private String message;
}

@Data
public class Result<T> implements Serializable {
    private static final long serialVersionUID = 1L;
    private boolean status = false;
    private String message;
    private T result;
    private String statusCode;
}

    The above two are my dtos. When I find PageResut, I get all fields, and the result field is T. Now I want to ask, how can I get that this generic type is Collection<T>, not T. Because in PageResult, Collection<T> has been used instead of T.

    Thank you everyone.Please help me.