JAVA initialization blocks

Question

As some sources say, the Java instance initialization blocks are executed whenever instance is created or right before constructor. But imagine this case:

public         


        

Answer 1

No. The initialization blocks are copied directly into the constructor(s). Obviously there is an implicit super in there as well. So your example becomes

public class Foo {
  public Foo()
  {
    {System.out.println("Foo init");} // initializer.
    {System.out.println("Foo constr");}
  }
}

public class Main extends Foo {
  public Main()
  {  
    super(); // super constructor.
    {System.out.println("Main init");} // initializer.
    {System.out.println("Main constr");}
  }
  public static void main(String[] args) {
    new Main();
  }
}

Which explains your observed behavior of

Foo init
Foo constr
Main init
Main constr