What is the result(hierarchy and static init blocks)? : Questions « Utility Classes « SCJP

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2. Utility Classes
3. Questions

class Bird {
  {
    System.out.print("b1 ");
  }

  public Bird() {
    System.out.print("b2 ");
  }
}

class Raptor extends Bird {
  static {
    System.out.print("r1 ");
  }

  public Raptor() {
    System.out.print("r2 ");
  }

  {
    System.out.print("r3 ");
  }
  static {
    System.out.print("r4 ");
  }
}

public class MainClass extends Raptor {
  public static void main(String[] args) {
    System.out.print("pre ");
    new MainClass();
    System.out.println("MainClass ");
  }
}