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Derek Fan
4,645 PointsQuestion about exercise2
Dear all, It's Derek. This is my first question, Thanks for your reply in advanced :)
The answer for exercise 2 might be as followed:
However, I wonder why it cant be the following: I tried but it doesn't work.
1 Answer
jcorum
71,830 PointsWell, the most immediate reason, as you saw, is that it won't work. You probably got an error message something like this:
incompatible types: BlogPost cannot be converted to String
obj1.getTitle() returns a String, and therefore can be assigned to result, which was declared a String. But more to the point, a String cannot be cast to a BlogPost, which is what result = (BlogPost) obj1.getTitle() is trying to do. In short, first you have to cast the object so it's a BlogPost, and then you can call a BlogPost method on it, viz., getTitle().
Derek Fan
4,645 PointsDerek Fan
4,645 PointsThanks for your clarification, jcorum : )