2

Does Apex support method return type overloading ?

I mean can I have a method in a class that return different type depending on it's Inputs ?

6

Yes, if the method signature is different you can have a different return type

In a class you can have

Integer add(Integer) 
String add(String) 

But you can't have

Integer add(Integer)
String add(Integer)

A working example :

public class myClass {

  public Integer add(Integer num){
    return null;
  }

  public String add(String str){
    return null;
  }

}
  • Typically the strategy is to use a more general type and cast it as the specific type, rather than arbitrarily changing the function parameters. A good example being Database.query(String query), which always returns a list<sObject> – martin Mar 20 '17 at 9:58
  • Yes, but I think that is more a JAVA way of thinking, if the method can return the specific type we need, why add a step of casting each time we invoke the method ! – benahm Mar 20 '17 at 10:02
  • In case of Database.query the list of sObject types is not limited we can always create new types, but If we need to return a limited list of type example : Integer, String, Boolean better to go with my example rather returning an Object type and cast it each invocation.... – benahm Mar 20 '17 at 10:33

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