Why final can be initialized in constructor?

Question

I read 2 things

final should be intialized during declaration
Else it will be considered as blank final variable which should be assigned at last line in constructor

Otherwise, you will get CTE.

My question is,

Why Java allows to assign/initialize value of final in constructor?

Suresh Atta · Accepted Answer · 2018-03-08T11:26:06.347

4

Because each instance can have it's own final value for it. And that can be done only through constructor because you can call constructor only once. If you want to make sure that the block gets executed only once and that too while creating the instance, constructor is the only place.

If you hard code in the class (initialising while declaring), that will be same for all the instances and almost become static.

edited Mar 08 '18 at 11:26

answered Mar 08 '18 at 11:20

Suresh Atta

120,458
37
198
307

Answer Accepted. Good to have few more lines of description – VVB Mar 08 '18 at 11:26
Not tried but can I make it as first line instead of last line in constructor – VVB Mar 08 '18 at 11:31

Why final can be initialized in constructor?

1 Answers1