overriding

[josephine chen]

which are true about overiding
both overiding and overridden methods must have same arg and name and returntypes//t
overiding method must not limit access more than the ridden//t
overiding must not throw any exceptions that may not be thrown by overidden method//f it can throw RuntimeException??
overiding method may not be private//t

[Jim Yingst]

"overiding must not throw any exceptions that may not be thrown by overidden method"
True. A RuntimeException may be thrown by the overridden method, and also by the overriding method. The statement agrees with this.
The other answers are correct.

[Shafeeq Sheikh]

Question for you Jim......
How is the last statement true???
Shouldn't it be false??? An overriding method CAN be private as long as the overridden method is private too???
class Child{
private void method1(){
System.out.println("From Parent");
}
}
public class Child2 extends Child{
private void method1(){
System.out.println("From Child");
}
public static void main(String args[]){
Child2 obj = new Child2();
obj.method1();
}
}
This compiles and works fine...
Thanks.

[Sushma]

U can't access private methods in the sub class, so no point of overriding them.
Sushma

[Anonymous]

A private method is not visible outside the class and for all practical purposes does not exist outside the class. So when a method with the same (or different) signature is defined in the derived class it is a new method which is in no way connected with the original method in the parent class.
Hope this helps!!
Regards,
Milind

[This message has been edited by Milind (edited May 30, 2000).]

[Anonymous]

Shan & Sushma,
I just went through these questions myself last week.
Please spend the time to review your access modifiers & modifiers.
How they can affect: class's, method's, & variables.
Once you get modifiers down...
Overloading and overriding will make alot more sense.
Enjoy the Day,
ttfn, Monty6


[This message has been edited by monty6 (edited May 30, 2000).]

[Shafeeq Sheikh]

Sushma and Milind.....
Agree with both of you'll but as far as the precisely worded statement goes it will be false.... right???
Practically speaking an 'overridden private method' would not make sense but the compiler allows it and there are no runtime errors.
If we get a question like this in the Exam what should the answer be???
Thanks....

[Herbert Maosa]

Shafeeq,
There is no such thing as "Overriden Private Method". When you declare a method in a sub class that has the same name as a private method in the base class, the compiler will not complain because it does not consider this as an attempt to override the original method, rather just as a re-declaration.So in this case the issue of overriding does not arise, hence the final answer holds.Note that the compiler does not disallow naming methods with the same name as in other classes if the classes are not related, if they are related then the rules governing overriding must apply.