A final variable in Java can be assigned a value only once, we can assign a value either in declaration or later.
final int i = 10; i = 30; // Error because i is final.
A blank final variable in Java is a final variable that is not initialized during declaration. Below is a simple example of blank final.
// A simple blank final example final int i; i = 30;
How are values assigned to blank final members of objects?
Values must be assigned in constructor.
If we have more than one constructors or overloaded constructor in class, then blank final variable must be initialized in all of them. However constructor chaining can be used to initialize the blank final variable.
Blank final variables are used to create immutable objects (objects whose members can’t be changed once initialized).
This article is contributed by Himanshi Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.