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


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

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