8

I have a class inheritance as follows.

public virtual class A{
   public virtual A myMethod(){
      return new A();
   }
}

public class B extends A{
   public override B myMethod(){
      return new B();
   }
}

But it throws an compile error:

Method return types clash: myMethod()

And my question is How to return child type instead of father type when overriding a method?

11

You can't alter the return type for overridden methods. Either return the parent type, which you can then cast to the child type, if it is a child, or simply return it as an Object (which is how various methods like JSON.deserialize works). In either case, you'll need to do casting at least some of the time.

Example:

public class B extends A {
    public override A construct() {
        return new B();
     }
}
| improve this answer | |
  • 2
    Ohhh, I stack with this restriction. It is one of the key feature of OPP languages like Java, for example. I can't understand why Apex can't do that , because everything working on the JVM, and if I clear it have 6 version. – Ruslan Kurchenko Oct 13 '16 at 20:36

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