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Polymorphic reference Exception question

john smith
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Joined: Jun 04, 2008
Posts: 14
(from SCJP for Java 5 by Kathy Sierra and Bet Bates, page 104)

class Animal{
public void eat() throws Exception{
// throws an exception
}
}
class Dog2 extends Animal{
public void eat(){ //no Exceptions{
public static void main(String[] args){
Animal a = new Dog2();
Dog2 d = new Dog2();
d.eat();
a.eat();
}
}

Question: The book says that the code will not compile because of the Exception declared on the Animal eat() method.

I do not understand why this is. Could somebody please help. Thank you in advance.
Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
Posts: 61766
    
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subject: Polymorphic reference Exception question