OnJava8-Examples/housekeeping/OrderOfInitialization.java

// housekeeping/OrderOfInitialization.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Demonstrates initialization order

// When the constructor is called to create a
// Window object, you'll see a message:
class Window {
  Window(int marker) {
    System.out.println("Window(" + marker + ")");
  }
}

class House {
  Window w1 = new Window(1); // Before constructor
  House() {
    // Show that we're in the constructor:
    System.out.println("House()");
    w3 = new Window(33); // Reinitialize w3
  }
  Window w2 = new Window(2); // After constructor
  void f() { System.out.println("f()"); }
  Window w3 = new Window(3); // At end
}

public class OrderOfInitialization {
  public static void main(String[] args) {
    House h = new House();
    h.f(); // Shows that construction is done
  }
}
/* Output:
Window(1)
Window(2)
Window(3)
House()
Window(33)
f()
*/