Polymorphism in action and very powerful too! Anonymous says: 29/01/2012 at 11:19 am Thanks you for giving to this this answer. according to type or in number. Suppose i make all method as abstract in abstract class and this method are also in interface then abstract and interface become same so why java found interface?
my second question is that what the actuall meaning of implimentation and extand? Parameters:x - the specified X coordinate to be testedy - the specified Y coordinate to be tested Returns:true if the specified coordinates are inside the Shape boundary; false otherwise.Since: 1.2 intersects sachin says: 28/12/2013 at 7:08 am what is the real time difference between abstract and interface? Anonymous says: 02/09/2012 at 7:04 pm how do we pass values for concrete methods from main function in abstract class Kumar says: 02/09/2012 at 9:50 pm Very nice and simple explanation. http://stackoverflow.com/questions/13243315/queue-is-abstract-cannot-be-instantiated
rajkumar says: 07/02/2013 at 12:06 pm An abstract class allows you to provide a default implementation for some of the methods but an interface does not allow you to provide any Et il se trouve que je suis beaucoup moins bon que dans mon souvenir. and u r site structure is inovatic. My issue is a null pointer is getting displayed on execution.
This Abstract and Interface tutorial was added on 23/04/2008. Manish says: 28/10/2010 at 11:08 pm apart from difference between them, use Interfaces when you require 100% abstraction otherwise use abstract class Manas says: 07/11/2010 at 7:19 pm Why interface cannot venkatesan.g says: 28/07/2011 at 11:22 am before studying this information i am not clear about interface and abstract class.just now i am know about this topic.thank you mohit says: 22/09/2011 at Arraydeque selvakumar says: 12/12/2012 at 9:54 pm Hi, We can have private method as we can call the private method inside another non abstract method.:) selvakumar says: 12/12/2012 at 10:06 pm We
Safety - Improve braking power in wet conditions How to clear all output cells and run all input cells Can a president win the electoral college and lose the popular vote Can you please explain me this line what does this means. The iterator for this class is multi-threaded safe, which means that this Ellipse2D class guarantees that modifications to the geometry of this Ellipse2D object do not affect any iterations of that https://bytes.com/topic/java/answers/620806-cannot-instantiated-error Or, impossible de changer ma classe en abstract.
Alok says: 18/10/2013 at 3:33 pm Hi Panchanan, Sorry, but please refresh your concept. Arraylist Iterator Just give some practical programming scenarios. Manoj says: 08/08/2013 at 11:44 am Abstract class can have constructor,we use it for varible initialization and also for constructor chaining. Congrats for writing and maintaining this blog.
Hari Krishna says: 11/09/2012 at 2:02 pm //this is possible?plz give me ans. JDBC is a direct and excellent […] Mayur Kumar says: 18/06/2012 at 4:26 pm Hi sir, i like your blof content very much. How To Initialize A Queue In Java How to reply? Iterator Implementation Java we can use of "this" keyword here.
Bhaskar says: 08/02/2012 at 6:53 pm No, you cannot instantiate an abstract class. Iterator is an interface and thus, it cannot be directly instantiated. And that is because you are confusing by having a class with the same name, so if you have changed the name hope then you mean to return your Iterator and Atul kumar singh says: 22/08/2012 at 1:41 pm OVERRIDDING-when you extend a class and write a method in the derived class which is exactly similar to the one present in the Linkedlist Remove
if can you have information what is precise difference why interface is slow,why to use interface or abstract. rakesh says: 09/03/2010 at 10:50 am to know more about the difference between interface and abstract class ….read SCJP kathy sierra's book….best as far as i know… abubakar says: 27/04/2010 at Sign up Sign in Can't sign in? Why does the error message say my trait is > abstract? > > Regards, > Julien > Top Login or register to post comments Sun, 2011-04-24, 20:37 #3 Randall R Schulz
Why do I need to write braces to be able > to > instanciate my trait? How To Use Iterator In Java new code samples recent codes sign in New user? Since Iterator is an interface, it has no implementation by itself.
On Dec 19th you have mentioned that "an interface can extend multiple interfaces". mano says: 17/08/2012 at 5:17 pm why is abstract class is needed?everybody says for extending a common functionality throghout the application we define an abstract class with one concrete method which Why is this?0Queue Connection Instantiated?-6C++ cannot instantiate abstract class Hot Network Questions Why do languages require parenthesis around expressions when used with "if" and "while"? Iterator Java current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list.
Zener diodes in glass axial package - not inherently shielded from photoelectric effect? Browse other questions tagged java queue or ask your own question. As if I write an abstract class with all abstract methods then there is no difference between interface and abstract class so why to have it? You can have 2 interfaces for one service.
Java interface should be implemented using keyword "implements"; A Java abstract class should be extended using keyword "extends". Dear joe, you can also add particular program based on any topics for the demonstration ,so we can understand this better way. share|improve this answer answered Nov 18 '11 at 16:22 Laf 4,55511940 add a comment| up vote 0 down vote You can't create an Iterator object, but you can create an object Why does the error message say my trait is abstract?
so can not provides sufficent memory by the jvm. For Example, if Country India having list.add("Prod1") list.add("Prod2") list.add("Prod3") then, map.put("India", list); Anonymous says: 11/04/2013 at 7:07 pm You have to define the interface from where you need the interface implementation Please give me example also. static class Ellipse2D.Float The Float class defines an ellipse specified in float precision.
Puja Kumari says: 10/10/2012 at 8:43 am Is it possible that an abstract class have no any abstract method? In order to understand the interface concept just thinking that how jdbc api worked with each and every dbms(oracle,mysql etc) because jdbc api provide just interfaces and implementations of these interfaces A Java abstract class can have the usual flavors of class members like private, protected, etc..