How to execute the blocks in java

Hi
I have doubt on block programing
class A{
System.out.println("hai");
public static void main(String[] args){
A a = new A();
compile and run the code the its display "hai" in console
how is it possible. How it default called ?

Slight terminology correction. There's no "anonymous" initializer. It's "instance initializer" and "static initializer."
class Foo {
  // instance initializer -- executed when an object is instantiated
    // do stuff
  // static initializer -- executed when the class is loaded
  static {
    // do stuff
}

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