Primitives/Objects Declaration, default initialization values

Question

When declaring primitives/objects, are them initialized?

Which are the default value?

What is the behavior on class members and local fields

Answer 1

The default value of int is 0 and that is the value it will have in both JavaSE and JavaEE unless it was assigned with another value.

You can't have an uninitialized int class member in Java (or any other primitive).

In your example you show the int is a class member, in the other example its a local variable, that is the difference.

For class members JVM will put the default values, for a local variables it makes you assign and initial value before accessing the variable.

You can check the Default Values section in Primitive Data Types for more information about the class members default values.