Java Abstract Methods : Return type

Consider an abstract class declaring an abstract method. Let the return type of the method be Object. Now lets say, a class extends this abstract class and defines this method. What should be the return type of this method to override the base abstract method? ;D, it can be anything!!

public abstract class AbstractClassA{
    public abstract Object getDataForDoingSomething();
}

public abstract class SClassA extends AbstractClassA{
    public List getDataForDoingSomething() {           
                return new ArrayList();
    }
}