Default values ​​for local variables?

Question

In Java , why class variables get an initialized default value. But local variables are not.?

Can anyone explain?

Answer 1

Local variables are not initialized to default values, as in the case of class variables. The same goes for primitives and object reference.

JavaDoc (section 4.12.5. Initial values ​​of variables):

 A local variable must be explicitly given a value before it is used, by either initialization or assignment, in a way that can be verified using the rules for definite assignment.