Final arrays and initialisation

[Duran Harris]

If I have the following:

final int[];

will all the cells in the array have their value set at 0(int's default value)
or is the final modifier just to prevent reassigning the reference??

[Sandeep Bhandari]

Duran Harris wrote:If I have the following:

final int[];

will all the cells in the array have their value set at 0(int's default value)
or is the final modifier just to prevent reassigning the reference??

assigning values is a runtime thing
and
reassigning check for final's is compile time thing

here you are declaring an array reference that will point to group of int's
the values of these int's can be changed but the array reference will continue to point to this group of int's till its lifetime.

[Ankit Garg]

Let me give you an example of what Sandeep just said

int[] arr1 = new int[5];  //all elements are initialized to 0
arr1[0] = 10;
arr1 = new int[3];  //OK
final int[] arr2 = new int[4];   //all elements are initialized to 0
arr2[3] = 25;
arr2[2] = 15;
arr2[3] = 30;
arr2 = new int[4];   //error, cannot change the value of final int[]

[Duran Harris]

Ok good..

then array+final behaves exactly the same as:
object+final

Thank you

[camilo lopes]

with final you can not do changes. other example with variables see:

classe Num{

final int num=10; 

public static void main(String arg[]){
new Num().num=30; // error
}
}

This code show error, when you try to compile. because I can not change one value of one variable final, it is impossible.

[Ankit Garg]

You would probably laugh at this but when I started programming I tried to do this :lol:

int i = 5++;

[Duran Harris]

In that case there is still hope for me.