public class A {
The static B B=new B (); 

Public static void main (String [] args) {
//B type from A class - this class instantiation object is set to null, this is no problem, 
B=null; 

//but the object b can be set to null himself? 
B.s etNull (); 
} 
} 

 public class B {
Void setNull () {
/* 
It is no good, I was meant to B type instantiation objects, 
Call this method, set themselves to null, whether can you? 
*/
This=null; 
} 
} 

CodePudding user response:

From the above example, an object seems to be no way to yourself is set to null, only can let others (other) to set himself to null,