java default local object variable initialization

Question

In java OCA book Oracle Certified Associate Java SE 8 Programmer there's this QCM: (Chap 1 question number 12)

A local variable of type Object default to null they respond that's false.

but I think that's a mistake because when we declare this for example : Object obj; as a local variable in a method , the code compiles fine , So the object is null what do you think guys ?

Answer 1

When you declare Object obj; inside a method, obj is uninitialized. This is still totally legal to do, but you cannot access obj without initializing it. If you go a little farther, and write:

Object local;

if (local == null) {
    // something
}

The compiler will stop you.