Sort an Array List. Using comparator. Link: https://stackoverflow.com/questions/2784514/sort-arraylist-of-custom-objects-by-property
/**
* Service Answer Option Comparator
*/
private class ServiceAnswerOptionComparator implements Comparator<ServiceAnswerOption> {
@Override
public int compare(ServiceAnswerOption sao1, ServiceAnswerOption sao2) {
return sao1.serviceQuestionOption.orderIndex - sao2.serviceQuestionOption.orderIndex;
}
}