Solved

how to create our own marker interface?

Posted on 2011-03-20
8
750 Views
Last Modified: 2012-08-13
Dear Experts

Please explain briefly how to create a user defined marker interface, and how JRE know it is a marker interface, explain the flow also
0
Comment
Question by:haneef_nb
  • 3
  • 3
  • 2
8 Comments
 
LVL 40

Expert Comment

by:gurvinder372
ID: 35178039
0
 
LVL 92

Expert Comment

by:objects
ID: 35178067
theres nothing special about a marker interface, its just an interface with no methods defined
The JRE does not treat it any differently, your application code would use it to check if an object implemented it and treat it accordingly
0
 

Author Comment

by:haneef_nb
ID: 35198564
Hi Both,

Thanks for your solution,

But in this links there is no answer for my question, i am asking that, can we create a user-defined marker interface or not, if yes, please provide the example, and kindly let me know how the jre knows it is a marker interface.
0
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 40

Expert Comment

by:gurvinder372
ID: 35198604
Yes, you can.

All you have to do is make a simple interface, but the interface will have no member and method declarations
0
 

Author Comment

by:haneef_nb
ID: 35198723
Hi,

No what am asking is, suppose in my class i have only getter methods, but i don't have any private & final variables, the variables are only public & non final variables, please tell me now can i call my class as Immutable, if no please tell me the reason.
0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 35198754
In that case, Yes, it is an immutable class, since it cannot be mutated (or evolved or change)
0
 
LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 35202697
> can we create a user-defined marker interface or not,

you can

> if yes, please provide the example,

public interface MyMarker {
}

> and kindly let me know how the jre knows it is a marker interface.

Its doesn't really, it would be used by your application classes.
Has nothing to do with the JRE, it just treats it the same as any interface
0
 

Author Closing Comment

by:haneef_nb
ID: 35376555
Thanks...
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
simple java question 3 54
jar file executable 12 51
hibernate example for saving data 19 37
How to determine if a string is a valid SHA value 7 28
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

816 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now