This week's book giveaways are in the Java EE and JavaScript forums.
We're giving away four copies each of The Java EE 7 Tutorial Volume 1 or Volume 2(winners choice) and jQuery UI in Action and have the authors on-line!
See this thread and this one for details.
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes object class Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of The Java EE 7 Tutorial Volume 1 or Volume 2 this week in the Java EE forum
or jQuery UI in Action in the JavaScript forum!
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "object class" Watch "object class" New topic
Author

object class

rahul mehra
Ranch Hand

Joined: Aug 20, 2007
Posts: 33
hi,
i'm writing a very simple program in which i do the following things :

a) create an object of apple type.
b) Create on object of Object type( since Object class is inherited by all the classes).


public class Apple {

public static void main(String[] args) {
Object o = new Object(); // 1
Apple m = new Apple(); // 2
m.clone(); // 3
o.clone(); // 4
}
}


question :

i get a complie time error in line 4 ( clone() is a protected access in java.lang.Object) but i can access the clone() method through the object of Apple class(line 3).

can you explain why???


Thanks
Alexsandra Carvalho
Ranch Hand

Joined: Jul 13, 2007
Posts: 75
Hi deeksha,

In the Apple class you have access to clone method by inheritance (as you said). But you only can access the protected method of a class if the new class is in the same package or through another subclass in any package.

Alexsandra
Neha Bhattad
Ranch Hand

Joined: Aug 20, 2007
Posts: 30
From Sun Java

>> The class Object does not itself implement the interface Cloneable, so calling the clone method on an object whose class is Object will result in throwing an exception at run time.
rahul mehra
Ranch Hand

Joined: Aug 20, 2007
Posts: 33
hi neha,

well it dosen't throw any execption at runtime .... it gives me a compile time error....

clone() is a protected access in java.lang.Object
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: object class