Tuesday, June 23, 2009

Reason me out!! 

Code:
public class Foo {
   public Foo() { System.out.println("constructor called"); }

   static { System.out.println("static initializer called"); }

   { System.out.println("instance initializer called"); }
}

Execute :
new Foo();
new Foo();

Output:
static initializer called
instance initializer called
constructor called
instance initializer called
constructor called

--Varun
at

3 comments:

  1. Antony Vincent Pandian.S.June 23, 2009 at 11:35 PM

    These are called as instance initializers. The code within these blocks are copied into every constructor by the compiler and are used to share common code across overloaded constructors.

    http://java.sun.com/docs/books/tutorial/java/javaOO/initial.html

    ReplyDelete
  2. Varunkumar NagarajanJune 23, 2009 at 11:44 PM

    Exactly!! :-) Just came to know about this today!!

    ReplyDelete
  3. PSeudocodeJune 24, 2009 at 1:02 AM

    that is because static blocks are always called once when the class is loaded into the memory by JVM which is not the case with instance and constructor initializers.

    ReplyDelete