final static

[Anna s Iyer]

class finals123 {              
final int a;
 //final static int a = 100;  //if variable a added with modifier static needs to be initialized??
 finals123() {
 a = 10;
 }                 
public static void main(String[] args) {            
finals123 f = new finals123();
System.out.println("Value of a "+f.a);
} 
}

When I add static modifier to the final variable a then I am getting compilation error and when it gets initialised the error goes off and runs by taking out the constructor and is fine(Cann't change the final value).
Could any one help me in understanding the behaviour of final with static?
Thanks,
Anna S Iyer.

[srival vas]

static final vars MUST be initialized either in declaration or in one of static initialization blocks.NOT in constructors.The compiler does not wait until the construction of the object.
But instance final vars may be initialized in the constructor. If it is initialized in constructor, ALL CONSTRUCTORS MUST initialize the instance final var.
In both cases once it is initialized we can not reassign a new value to them
:
there u go.

[Andri G]

It's not just the static that counts, but also the final.

static = class/non-instance member/variable

final = its value cannot be changed except....

[non static] final means you cannot change the value except within the constructors

static final means you cannot change the value (including within constructors) except within the static initialization block which is executed when the class is loaded.
So if you want to make a static final variable then
you initialize it either along with the declaration or within
the static block.
Add the following after the declaration

 
  static {
    a = 10;
  }

Hope this would help