Overriden queston

[Dinesh Tahiliani]

Can a public method be overriden by protected method?
Please explain with example. getting confused..

[Stevi Deter]

Dinesh,

You can increase the visibility of a member through overriding, but you can't decrease it. So you can declare the subclass's overridden member public when the parent method is protected, but not vice versa.

[Dinesh Tahiliani]

thanks

[Ivan Ivanic]

just to help you look at this example:

//file One.java
package one;
public class Super{
  public void someMethod();
}
public class Sub extends Super{
  protected void someMethod();// this would break API for classes
                              // trying to access this method
}
 
//file Two.java
package two;
import one.*;
class TestClass{
  public static void main(String[]args){
    Super sub = new Sub();
    sub.someMethod(); // here program would break because you would try
                      // to call overridden method but you wouldn't have
                      // access to it.
  }
}

[marc weber]

An "overridden question" occurs when a rancher posts a question underneath a topic that began with a different question. Then when other ranchers read the thread, they will be inclined to respond to the most recent post.

(Sorry. I haven't had coffee yet. :roll: )

[Ivan Ivanic]

[Ben Souther]

Originally posted by Dinesh Tahiliani:
Can a public method be overriden by protected method?
Please explain with example. getting confused..

Dinesh,
It took you 31 minutes to get a reply to this question.
I'm sure some more time elapsed before you had a chance to notice that someone had replied to it.

How long do you think it would have taken to write and compile two small classes to find this out on your own?

[Dinesh Tahiliani]

sub.someMethod(); // here program would break because you would try
                  // to call overridden method but you wouldn't have 
                  // access to it.

Ivanic,
I nyour program you override the method which was having access modifier public and now it is protected.
As far i know the protected variable is accessible in same package but also the subclass of other package which you have done in your prog.
Correct me if i am wrong..


[BPSouther: Added newlines to narrow this thread a bit]
[ May 06, 2008: Message edited by: Ben Souther ]

[Bert Bates]

Hi Dinesh,

The moderators here are really trying to help you! When Ben asks you to write your own code to test this question it's because that is ABSOLUTELY the best way for you to learn this stuff

It seems that you're not comfortable writing your own Java programs to test stuff out. You really have to make a shift and get used to compiling and running code from the command line. Everyone who scores well on these exams studies by writing and testing a lot of code. The compiler and the JVM are your friends, and compiler errors are your friends too!

We will be thrilled to see you post some code and some error messages and ask what's going on!

hth,

Bert