Final methods

[Abhi vijay]

Can an abstract class have final methods?

[Kumaresh Vidhyasagar]

No you can't have

[Paul Clapham]

Sure. Why wouldn't that be allowed?

[Abhi vijay]

  abstract class Abs
{
final void go()
{
System.out.println("final");
}
}


public class Bs extends Abs
{
public static void main(String[] args)
{
}
}  

Even I was under the impression that they cant have. But look at the code above. it compiles fine.

[Abhi vijay]

Paul Clapham wrote:Sure. Why wouldn't that be allowed?

Final methods cannot be overriden, but once they are inherited by the subclass, there is a possibility that they will be overridden. I donno..I am a bit confused...

[promila singh]

yes you can have final methods in abstract class
try this code
abstract class abstractclass
{
final public void display(){
System.out.println("Display");
}
abstract void show();
}
public class extendedclass extends abstractclass{
public static void main(String args[]){
array aa = new array();
aa.display();
aa.show();
}
public void show(){
System.out.println("show");
}
}

[Abhi vijay]

Promila, please use code tags.

http://faq.javaranch.com/java/UseCodeTags

[Abhi vijay]

Ok, Now I figured out. That when a subclass extends an abstract class, it inherits its methods(final also). Its only when you try to override the inherited final methods, when you get a Compiler error. Should have thought about it earlier ops: .

[promila singh]

m new here
thanks abhi vijay

[Punit Singh]

Abhi remember, abstract class cannot have:

1) abstract final methods.
2) private abstract methods.
3) native abstract methods.
4) abstract synchronized methods.
5) strictfp native methods.

abstract class can have:

1) private native methods
2) synchronized methods with body
3) protected abstract methods
4) private static synchronized native methods.

[Abhi vijay]

Punit, To my Rescue Again