Stupid way of doing it. Class variable initialization

Often see someone write the following class variable initialization code:

public class A {
private int intA = 0;
Private A objecta = null;
}

This is a silly reason: The system initializes an object with the default initialization of each class variable before invoking the class's constructor, such as int assignment 0, object reference assignment null, and so on.

The above code, after Inta, Objecta has been initialized by the system to 0, NULL, and again initialized to 0, null (the system of course do not know that you give the initial value of the same as his preset), obviously the lily.