dcsimg
Login | Register   
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.


Tip of the Day
Language: Java
Expertise: Beginner
Aug 3, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


What Final Does in Java

When you declare a class as final, it can no longer be subclassed. Java has used this for security purposes with classes like String and Integer. It also allows the compiler to make some optimizations.

When you declare a method of a class as final, subclasses of the class cannot override the method.

When you declare a data field of a class as final, the value of that data field cannot be changed after it is initialized. Moreover, when you declare a final data field, you must assign a value in an initializer, as in:

final boolean ALWAYS_TRUE = true;

After this declaration, Any other attempt to assign a value to ALWAYS_TRUE would results in a compile-time error.

Behrouz Fallahi
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date