Dynamic list using ternary if are not accepted by apex

Question

Considering the code snippet:

..
List<SObject> lstSObject = sentence == true ? List<typeA__c>() : List<typeB__c>(); 

Salesforce doesn't explain much as this operator should be straightforward.

And following the principle of the java operator too. https://en.wikipedia.org/wiki/%3F:#Java

To confirm my thought, is the compiler verifying what is bidding on the interface (List) and considering its type itself?

Answer 1

That's not true, for the same SObject types, it works, you just forgot new:

List<SObject> lstSObject = (sentence ? new List<typeA__c>() : new List<typeA__c>());

And for different SObject types it works too, but you should do casting:

List<SObject> lstSObject = (sentence ? (List<SObject>) new List<typeA__c>() : (List<SObject>) new List<typeB__c>());