List with multiple objects using Comparator

Question

Hi,
I have a comparator to sort the fields of 2 objects. I have a resultlist which contains the CustomerAddressVO which contains the properties of both
Customer and Address entities List resultList<CustomerAddressVO>.
This CustomerAddressVO.java in turn have
private long id
private Customer customer;
private Address address;
Where Customer.java
will have properties of customer
Where Address.java
will have properties of address
Now i need to use the comparator for customer.getName() asc and address.id() desc, as i have mentioned the resultList doesn't directly contain this object as it contains CustomerAddressVO which in turn have those two object Customer and Address. Hence unless you iterate the list and retrieve the respective objects (customer, address) you cannot do the sorting through comparator. In such case how we can go about it. If you iterate the list also how we can pass the respective object to the compare() ? And more importantly we need to sort the columns of 2 different entites? Please clarify how we can go about it?
Thanks.

Answer 1

You can still do the sorting through a Comparator
The compare method should take
public int compare(CustomerAddressVO o1, CustomerAddressVO o2) { //..so you can then do
01.getCustomer().getName();
//and
o1.getAddress().getId() together with relevant null checks