I really should know this, but for some reason I don't understand the following.
My abstract class contains the following abstract method:
protected abstract RuleDTO createRowToBeCloned(RuleDTO ruleDTO);
I also have another class as follows:
EvaluationRuleDTO extends from RuleDTO
Then in a subclass of my abstract class I have the following implementation which is not allowed due to "must override or implement a supertype method":
protected EvaluationRuleDTO createRowToBeCloned(EvaluationRuleDTO ruleDTO) {
However, the following is allowed:
protected EvaluationRuleDTO createRowToBeCloned(RuleDTO ruleDTO) {
I realize this is probably a basic question but I am a little bemused. How come I can I can return a subclass of RuleDTO in the overridden method, but I can't pass in a subclass?
Thanks