The full process of initialization : Initialization Block « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Initialization Block

class Insect {
  private int i = 1;

  protected int j;

  Insect() {
    System.out.println("i = " + i + ", j = " + j);
    j = 1;
  }

  private static int x1 = print("static Insect.x1 initialized");

  static int print(String s) {
    System.out.println(s);
    return 0;
  }
}

class Beetle extends Insect {
  private int k = print("Beetle.k initialized");

  public Beetle() {
    System.out.println("k = " + k);
    System.out.println("j = " + j);
  }

  private static int x2 = print("static Beetle.x2 initialized");
}

public class MainClass {
  public static void main(String[] args) {
    Beetle b = new Beetle();
  }

}

static Insect.x1 initialized
static Beetle.x2 initialized
i = 1, j = 0
Beetle.k initialized
k = 0
j = 1